Miatapower List Archive

This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


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Mail From: "Mark Phillips" <(email redacted)>

Bryan,

=20

I'd check the sender unit and wiring first. It could have a raw spot on the
wire shorting to ground or a pin hole in the diaphragm.

=20

Mark

=20

-----Original Message-----
From: Bryan Wyatt [mailto:(email redacted)]=20
Sent: Monday, April 02, 2007 7:39 AM
To: Miata Power List
Subject: Does anyone have a mechanical OPG?

=20

All,

=20

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing
a Samba lately and reading funny. By "funny," I mean that sometimes, the
needle bounces instead of moving in a slow arc. I expect that the value the
gauge reads would change with engine speed, but the needle is not supposed
to move like a metronome as engine speed increases, which is what it looks
like sometimes. At first I thought it was just an electrical problem,
but...

=20

...What scares me is that the first start of each day seems to read 0 for a
disconcerting length of time. Every start after that, the pressure rises
almost instantly to normal levels. Sounds unfortunately like symptoms of a
sticky relief valve or an oil pump on the way out. I'd rather not have to
pull the engine, though, so I'd like to check it with a mechanical gauge
first.

=20

Can anyone help me out?

=20

-Bryan

=20

No signature...the choice of a New Generation

=20=20

_____=20=20

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This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

What would be a way to check the sending unit? Do I have to open it up or something?

-Bryan

Mark Phillips <(email redacted)> wrote:
Bryan,

I’d check the sender unit and wiring first. It could have a raw spot on the wire shorting to ground or a pin hole in the diaphragm.

Mark

-----Original Message-----
From: Bryan Wyatt [mailto:(email redacted)]
Sent: Monday, April 02, 2007 7:39 AM
To: Miata Power List
Subject: Does anyone have a mechanical OPG?

All,



My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...



...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.



Can anyone help me out?



-Bryan


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Mail From: "Ray" <(email redacted)>

The OEM sensors make pretty good knock sensors. If you have a genuine '90-=
95 Miata OPG sender that it may be knock that you're seeing rather than def=
ective hardware.=20=20
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been do=
ing a Samba lately and reading funny. By "funny," I mean that sometimes, t=
he needle bounces instead of moving in a slow arc. I expect that the value=
the gauge reads would change with engine speed, but the needle is not supp=
osed to move like a metronome as engine speed increases, which is what it l=
ooks like sometimes. At first I thought it was just an electrical problem,=
but...

...What scares me is that the first start of each day seems to read 0 for=
a disconcerting length of time. Every start after that, the pressure rise=
s almost instantly to normal levels. Sounds unfortunately like symptoms of=
a sticky relief valve or an oil pump on the way out. I'd rather not have =
to pull the engine, though, so I'd like to check it with a mechanical gauge=
first.

Can anyone help me out?

-Bryan



No signature...the choice of a New Generation


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Mail From: Bryan Wyatt <(email redacted)>

Yes, it's a real gauge and sender (retrofitted from a 92). Knock would be pretty strange at 3k rpms or less. The weird sendings have caused me to pretty much keep it below 4k. As a matter of fact, the gauge tends to read better at high rpms than lower (but of course by the time I feel comfortable doing that, the car's well warmed up and the pump should be working normally).

Am I just nuts to think that knock is not likely the issue? Does anyone know where I could buy a gauge?

-Bryan

Ray <(email redacted)> wrote:
The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


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This read-only message was archived from a public mail list.
Mail From: "Larry Alster" <(email redacted)>

Doesn't account for the low reading though, right??

Larry
=20
White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5
=20
LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----=20
From: Ray=20
To: Bryan Wyatt ; Miata Power List=20
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuine '9=
0-95 Miata OPG sender that it may be knock that you're seeing rather than d=
efective hardware.=20=20
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been =
doing a Samba lately and reading funny. By "funny," I mean that sometimes,=
the needle bounces instead of moving in a slow arc. I expect that the val=
ue the gauge reads would change with engine speed, but the needle is not su=
pposed to move like a metronome as engine speed increases, which is what it=
looks like sometimes. At first I thought it was just an electrical proble=
m, but...

...What scares me is that the first start of each day seems to read 0 f=
or a disconcerting length of time. Every start after that, the pressure ri=
ses almost instantly to normal levels. Sounds unfortunately like symptoms =
of a sticky relief valve or an oil pump on the way out. I'd rather not hav=
e to pull the engine, though, so I'd like to check it with a mechanical gau=
ge first.

Can anyone help me out?

-Bryan



No signature...the choice of a New Generation


----------------------------------------------------------------------------
Need Mail bonding?
Go to the Yahoo! Mail Q&A for great tips from Yahoo! Answers users.=

This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

Also, I wonder if a corroded sender terminal would explain the fact that it's really only the first startup of the day (when the oil has all drained the night before) that the gauge reads 0. If that's true, why would pressure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when the engine is warm (ie after 20mi of driving). Isn't the relief valve supposed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----
From: Ray
To: Bryan Wyatt ; Miata Power List
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


No signature...the choice of a New Generation



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This read-only message was archived from a public mail list.
Mail From: "Larry Alster" <(email redacted)>

Depends on your gauge.

My 92 never reads above 60 psi when warm, my 91 always reads above 60 when =
warm.
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 3:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact that =
it's really only the first startup of the day (when the oil has all drained=
the night before) that the gauge reads 0. If that's true, why would press=
ure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when th=
e engine is warm (ie after 20mi of driving). Isn't the relief valve suppos=
ed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry
=20=20=20=20=20
White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5
=20=20=20=20=20
LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----=20
From: Ray=20
To: Bryan Wyatt ; Miata Power List=20
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuin=
e '90-95 Miata OPG sender that it may be knock that you're seeing rather th=
an defective hardware.=20=20
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has b=
een doing a Samba lately and reading funny. By "funny," I mean that someti=
mes, the needle bounces instead of moving in a slow arc. I expect that the=
value the gauge reads would change with engine speed, but the needle is no=
t supposed to move like a metronome as engine speed increases, which is wha=
t it looks like sometimes. At first I thought it was just an electrical pr=
oblem, but...

...What scares me is that the first start of each day seems to read=
0 for a disconcerting length of time. Every start after that, the pressur=
e rises almost instantly to normal levels. Sounds unfortunately like sympt=
oms of a sticky relief valve or an oil pump on the way out. I'd rather not=
have to pull the engine, though, so I'd like to check it with a mechanical=
gauge first.

Can anyone help me out?

-Bryan



No signature...the choice of a New Generation

------------------------------------------------------------------------
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No signature...the choice of a New Generation


---------------------------------------------------------------------------=
---
Looking for earth-friendly autos?=20
Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.=20=

This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

Ahhh...

I do know for a fact that I had to recalibrate my gauge shortly after I bought it. Chad and I sat down and found the correct values that the gauge should read for each resistance value and set the gauge accordingly, so it should be accurate.

My money's either on the sender (which would be nice!) or the pump (which would be very not nice!).

-Bryan

Larry Alster <(email redacted)> wrote:
Depends on your gauge.

My 92 never reads above 60 psi when warm, my 91 always reads above 60 when warm.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 3:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact that it's really only the first startup of the day (when the oil has all drained the night before) that the gauge reads 0. If that's true, why would pressure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when the engine is warm (ie after 20mi of driving). Isn't the relief valve supposed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----
From: Ray
To: Bryan Wyatt ; Miata Power List
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


No signature...the choice of a New Generation



---------------------------------
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---------------------------------
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This read-only message was archived from a public mail list.
Mail From: "Ray" <(email redacted)>

My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That was wi=
th 20w50 oil. The idle pressure would have been lower with thinner oil.
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 12:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact that =
it's really only the first startup of the day (when the oil has all drained=
the night before) that the gauge reads 0. If that's true, why would press=
ure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when th=
e engine is warm (ie after 20mi of driving). Isn't the relief valve suppos=
ed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry
=20=20=20=20=20
White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5
=20=20=20=20=20
LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----=20
From: Ray=20
To: Bryan Wyatt ; Miata Power List=20
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuin=
e '90-95 Miata OPG sender that it may be knock that you're seeing rather th=
an defective hardware.=20=20
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has b=
een doing a Samba lately and reading funny. By "funny," I mean that someti=
mes, the needle bounces instead of moving in a slow arc. I expect that the=
value the gauge reads would change with engine speed, but the needle is no=
t supposed to move like a metronome as engine speed increases, which is wha=
t it looks like sometimes. At first I thought it was just an electrical pr=
oblem, but...

...What scares me is that the first start of each day seems to read=
0 for a disconcerting length of time. Every start after that, the pressur=
e rises almost instantly to normal levels. Sounds unfortunately like sympt=
oms of a sticky relief valve or an oil pump on the way out. I'd rather not=
have to pull the engine, though, so I'd like to check it with a mechanical=
gauge first.

Can anyone help me out?

-Bryan



No signature...the choice of a New Generation

------------------------------------------------------------------------
Need Mail bonding?
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No signature...the choice of a New Generation


---------------------------------------------------------------------------=
---
Looking for earth-friendly autos?=20
Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.=20=

This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

Strangely enough, I left the car sitting all day (in the sun) while I was at work, and had to fire it up to move it before I had guests over for the evening.

Wouldn't you know it? The car fired up, and the gauge moved instantly! I'll try it tomorrow again and see what happens. In the meantime, I'll also try the other sender and see if maybe it's just that. MAN! would that be a relief.

Once I get past this one, I was thinking of getting an Autometer or other mechanical gauge rather than relying on the electric one. Something like this:

tinyurl.com/yoo3jd

Any thoughts?

-Bryan

Ray <(email redacted)> wrote:
My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That was with 20w50 oil. The idle pressure would have been lower with thinner oil.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 12:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact that it's really only the first startup of the day (when the oil has all drained the night before) that the gauge reads 0. If that's true, why would pressure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when the engine is warm (ie after 20mi of driving). Isn't the relief valve supposed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----
From: Ray
To: Bryan Wyatt ; Miata Power List
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


No signature...the choice of a New Generation



---------------------------------
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No signature...the choice of a New Generation



---------------------------------
Looking for earth-friendly autos?
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---------------------------------
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This read-only message was archived from a public mail list.
Mail From: "Larry Alster" <(email redacted)>

Using what tubing???

Plastic is easy to kink and have fail, copper is hard to run.

I'm not a fan of having oil inside my car.

JMHO

Larry
=20
White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5
=20
LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 9:48 PM
Subject: Re: Does anyone have a mechanical OPG?


Strangely enough, I left the car sitting all day (in the sun) while I was=
at work, and had to fire it up to move it before I had guests over for the=
evening.

Wouldn't you know it? The car fired up, and the gauge moved instantly! =
I'll try it tomorrow again and see what happens. In the meantime, I'll als=
o try the other sender and see if maybe it's just that. MAN! would that be=
a relief.

Once I get past this one, I was thinking of getting an Autometer or other=
mechanical gauge rather than relying on the electric one. Something like =
this:

tinyurl.com/yoo3jd

Any thoughts?

-Bryan

Ray <(email redacted)> wrote:
My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That wa=
s with 20w50 oil. The idle pressure would have been lower with thinner oil.
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 12:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact t=
hat it's really only the first startup of the day (when the oil has all dra=
ined the night before) that the gauge reads 0. If that's true, why would p=
ressure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even whe=
n the engine is warm (ie after 20mi of driving). Isn't the relief valve su=
pposed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry
=20=20=20=20=20=20=20=20=20
White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5
=20=20=20=20=20=20=20=20=20
LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----=20
From: Ray=20
To: Bryan Wyatt ; Miata Power List=20
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a ge=
nuine '90-95 Miata OPG sender that it may be knock that you're seeing rathe=
r than defective hardware.=20=20
----- Original Message -----=20
From: Bryan Wyatt=20
To: Miata Power List=20
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) h=
as been doing a Samba lately and reading funny. By "funny," I mean that so=
metimes, the needle bounces instead of moving in a slow arc. I expect that=
the value the gauge reads would change with engine speed, but the needle i=
s not supposed to move like a metronome as engine speed increases, which is=
what it looks like sometimes. At first I thought it was just an electrica=
l problem, but...

...What scares me is that the first start of each day seems to =
read 0 for a disconcerting length of time. Every start after that, the pre=
ssure rises almost instantly to normal levels. Sounds unfortunately like s=
ymptoms of a sticky relief valve or an oil pump on the way out. I'd rather=
not have to pull the engine, though, so I'd like to check it with a mechan=
ical gauge first.

Can anyone help me out?

-Bryan



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This read-only message was archived from a public mail list.
Mail From: Bryan Wyatt <(email redacted)>

That would be the disadvantage. I just wanted to hear it from the group at large.

-Bryan

Larry Alster <(email redacted)> wrote:
Using what tubing???

Plastic is easy to kink and have fail, copper is hard to run.

I'm not a fan of having oil inside my car.

JMHO

Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 9:48 PM
Subject: Re: Does anyone have a mechanical OPG?


Strangely enough, I left the car sitting all day (in the sun) while I was at work, and had to fire it up to move it before I had guests over for the evening.

Wouldn't you know it? The car fired up, and the gauge moved instantly! I'll try it tomorrow again and see what happens. In the meantime, I'll also try the other sender and see if maybe it's just that. MAN! would that be a relief.

Once I get past this one, I was thinking of getting an Autometer or other mechanical gauge rather than relying on the electric one. Something like this:

tinyurl.com/yoo3jd

Any thoughts?

-Bryan

Ray <(email redacted)> wrote:
My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That was with 20w50 oil. The idle pressure would have been lower with thinner oil.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 12:09 PM
Subject: Re: Does anyone have a mechanical OPG?


Also, I wonder if a corroded sender terminal would explain the fact that it's really only the first startup of the day (when the oil has all drained the night before) that the gauge reads 0. If that's true, why would pressure rise instantly for every subsequent startup?

One thing I do note is that the pressure will go above 60psi even when the engine is warm (ie after 20mi of driving). Isn't the relief valve supposed to keep that from happening?

-Bryan

Larry Alster <(email redacted)> wrote:
Doesn't account for the low reading though, right??

Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074
----- Original Message -----
From: Ray
To: Bryan Wyatt ; Miata Power List
Sent: Monday, April 02, 2007 9:37 AM
Subject: Re: Does anyone have a mechanical OPG?


The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.
----- Original Message -----
From: Bryan Wyatt
To: Miata Power List
Sent: Monday, April 02, 2007 4:39 AM
Subject: Does anyone have a mechanical OPG?


All,

My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...

...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.

Can anyone help me out?

-Bryan


No signature...the choice of a New Generation



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This read-only message was archived from a public mail list.
Mail From: "Luis" <(email redacted)>

Bryan,



My thoughts on the subject are this:



1) Clean the contacts on the existing sending unit.

2) Test with a new sending unit

3) Install a mechanical OPG temporarily.



As for mechanical OPGs: Before spending $$$ on gauges, go to Meijer, Kmart,
Wal-Mart, or other discount store and look at the gauges they sell. Some
years ago, I picked up a set of three gauges for $10 including the tuning
and fittings. I plumbed it in temporarily in a friend's car and found the
problem.



Luis



_____

From: Bryan Wyatt [mailto:(email redacted)]
Sent: Monday, April 02, 2007 9:49 PM
To: Miata Power List
Subject: Re: Does anyone have a mechanical OPG?



Strangely enough, I left the car sitting all day (in the sun) while I was at
work, and had to fire it up to move it before I had guests over for the
evening.



Wouldn't you know it? The car fired up, and the gauge moved instantly!
I'll try it tomorrow again and see what happens. In the meantime, I'll also
try the other sender and see if maybe it's just that. MAN! would that be a
relief.



Once I get past this one, I was thinking of getting an Autometer or other
mechanical gauge rather than relying on the electric one. Something like
this:



tinyurl.com/yoo3jd



Any thoughts?



-Bryan

Ray <(email redacted)> wrote:

My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That was
with 20w50 oil. The idle pressure would have been lower with thinner oil.

----- Original Message -----

From: Bryan Wyatt <mailto:(email redacted)>

To: Miata <mailto:(email redacted)> Power List

Sent: Monday, April 02, 2007 12:09 PM

Subject: Re: Does anyone have a mechanical OPG?



Also, I wonder if a corroded sender terminal would explain the fact that
it's really only the first startup of the day (when the oil has all drained
the night before) that the gauge reads 0. If that's true, why would
pressure rise instantly for every subsequent startup?



One thing I do note is that the pressure will go above 60psi even when the
engine is warm (ie after 20mi of driving). Isn't the relief valve supposed
to keep that from happening?



-Bryan

Larry Alster <(email redacted)> wrote:

Doesn't account for the low reading though, right??



Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
<lowcountrymiataclub.net/>
Masters Miata
RAGS 074

----- Original Message -----

From: Ray <mailto:(email redacted)>

To: Bryan Wyatt <mailto:(email redacted)> ; Miata
<mailto:(email redacted)> Power List

Sent: Monday, April 02, 2007 9:37 AM

Subject: Re: Does anyone have a mechanical OPG?



The OEM sensors make pretty good knock sensors. If you have a genuine
'90-95 Miata OPG sender that it may be knock that you're seeing rather than
defective hardware.

----- Original Message -----

From: Bryan Wyatt <mailto:(email redacted)>

To: Miata <mailto:(email redacted)> Power List

Sent: Monday, April 02, 2007 4:39 AM

Subject: Does anyone have a mechanical OPG?



All,



My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing
a Samba lately and reading funny. By "funny," I mean that sometimes, the
needle bounces instead of moving in a slow arc. I expect that the value the
gauge reads would change with engine speed, but the needle is not supposed
to move like a metronome as engine speed increases, which is what it looks
like sometimes. At first I thought it was just an electrical problem,
but...



...What scares me is that the first start of each day seems to read 0 for a
disconcerting length of time. Every start after that, the pressure rises
almost instantly to normal levels. Sounds unfortunately like symptoms of a
sticky relief valve or an oil pump on the way out. I'd rather not have to
pull the engine, though, so I'd like to check it with a mechanical gauge
first.



Can anyone help me out?



-Bryan



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Mail From: Bryan Wyatt <(email redacted)>

I appreciate the thoughts. I'll see what happens after tomorrow.

-Bryan

Luis <(email redacted)> wrote:
v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} st1\:*{behavior:url(#default#ieooui) } Bryan,

My thoughts on the subject are this:

1) Clean the contacts on the existing sending unit.
2) Test with a new sending unit
3) Install a mechanical OPG temporarily.

As for mechanical OPGs: Before spending $$$ on gauges, go to Meijer, Kmart, Wal-Mart, or other discount store and look at the gauges they sell. Some years ago, I picked up a set of three gauges for $10 including the tuning and fittings. I plumbed it in temporarily in a friend’s car and found the problem.

Luis


---------------------------------

From: Bryan Wyatt [mailto:(email redacted)]
Sent: Monday, April 02, 2007 9:49 PM
To: Miata Power List
Subject: Re: Does anyone have a mechanical OPG?


Strangely enough, I left the car sitting all day (in the sun) while I was at work, and had to fire it up to move it before I had guests over for the evening.



Wouldn't you know it? The car fired up, and the gauge moved instantly! I'll try it tomorrow again and see what happens. In the meantime, I'll also try the other sender and see if maybe it's just that. MAN! would that be a relief.



Once I get past this one, I was thinking of getting an Autometer or other mechanical gauge rather than relying on the electric one. Something like this:



tinyurl.com/yoo3jd



Any thoughts?



-Bryan

Ray <(email redacted)> wrote:

My '96 always read ~75 cold. Hot at +rpm ~60 and at idle ~25. That was with 20w50 oil. The idle pressure would have been lower with thinner oil.

----- Original Message -----

From: Bryan Wyatt

To: Miata Power List

Sent: Monday, April 02, 2007 12:09 PM

Subject: Re: Does anyone have a mechanical OPG?



Also, I wonder if a corroded sender terminal would explain the fact that it's really only the first startup of the day (when the oil has all drained the night before) that the gauge reads 0. If that's true, why would pressure rise instantly for every subsequent startup?



One thing I do note is that the pressure will go above 60psi even when the engine is warm (ie after 20mi of driving). Isn't the relief valve supposed to keep that from happening?



-Bryan

Larry Alster <(email redacted)> wrote:

Doesn't account for the low reading though, right??



Larry

White Knight 1991 Crystal White #99 CSP
Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo
Honey B 1992 Sunburst Yellow
Whooosh 2004 Titanium Mazdaspeed MX-5

LowCountry Miata lowcountrymiataclub.net
Masters Miata
RAGS 074

----- Original Message -----

From: Ray

To: Bryan Wyatt ; Miata Power List

Sent: Monday, April 02, 2007 9:37 AM

Subject: Re: Does anyone have a mechanical OPG?



The OEM sensors make pretty good knock sensors. If you have a genuine '90-95 Miata OPG sender that it may be knock that you're seeing rather than defective hardware.

----- Original Message -----

From: Bryan Wyatt

To: Miata Power List

Sent: Monday, April 02, 2007 4:39 AM

Subject: Does anyone have a mechanical OPG?



All,



My Mazda OPG (retrofitted a "real" gauge and sender to my 97) has been doing a Samba lately and reading funny. By "funny," I mean that sometimes, the needle bounces instead of moving in a slow arc. I expect that the value the gauge reads would change with engine speed, but the needle is not supposed to move like a metronome as engine speed increases, which is what it looks like sometimes. At first I thought it was just an electrical problem, but...



...What scares me is that the first start of each day seems to read 0 for a disconcerting length of time. Every start after that, the pressure rises almost instantly to normal levels. Sounds unfortunately like symptoms of a sticky relief valve or an oil pump on the way out. I'd rather not have to pull the engine, though, so I'd like to check it with a mechanical gauge first.



Can anyone help me out?



-Bryan


No signature...the choice of a New Generation




---------------------------------

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