Miatapower List Archive

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Mail From: (email redacted)

Hi. I am getting a serious misfire anytime I exceed 5psi. I have tried a number of things and the misfire continues. I did notice a spark jumping fom the #2 wire to the coil when I blip the throttle at the throttle body. Yesterday I took the coil out and cleaned it thoroughly and it didn't help at all. What do you think?

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Mail From: "Eric Vaillancourt" <(email redacted)>

What other things have you tried so far?

Plug wires? (what brand are you currently using and the mileage on them?)

Spark plug gap? (.040 is stock, but many FI cars run 0.29-0.30, depending
on the system.)

Spark plugs? (what brand and heat range, extended reach?)

Please describe your FI system so that we can more easily suggest
appropriate action. SC or Turbo, brand, ECU, fuel pump(s), AFPR?, max boost
of the system, etc.

Eric
----- Original Message -----
From: <(email redacted)>
To: <(email redacted)>
Sent: Sunday, July 14, 2002 12:04 PM
Subject: Do I need a new coil?


> Hi. I am getting a serious misfire anytime I exceed 5psi. I have tried a
number of things and the misfire continues. I did notice a spark jumping fom
the #2 wire to the coil when I blip the throttle at the throttle body.
Yesterday I took the coil out and cleaned it thoroughly and it didn't help
at all. What do you think?
>

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Mail From: (email redacted)

Sorry....my first time here. I have a 1.6, GReddy turbo, and Link ECUw/RC440s. Plugs(new) are gapped at .029 and I am using NGK wires(new). I have checked ground connections, injector connections, O2 connections and readings.

Anyway, I am consistantly losing one cylinder at 5-6psi. It happened suddenly one night. I was previously running up to 15psi without a problem.

I had this problem before and I cleaned up the coils with alcohol and the problem was solved.

Thanks.

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Mail From: Ron Van Vliet <(email redacted)>

A few thoughts from someone who's battled ignition gremlins and is now
running smoothly:

When you cleaned the coil pack did you take a close look inside the plug
wire sockets? Everything should look brassy, not grey. If even one socket
is carboned up it can cause the problems you are describing (will affect two
cylinders, not just one). Alcohol won't remove the carbon -- it's like
granite. Also check the black, insulated part of the sockets for carbon
traces. If the sockets are really carboned up, it's time for a new coil
pack.

Less likely but possible solutions, make sure the contacts on the coil end
of the plug wires are sufficiently spread out to make good contact in the
socket and don't forget to push the spark plug boots of the wires down hard
(especially with the NGK wires).

When you solve your problem, dielectric grease at both ends of the plug
wires is not a bad idea -- prevents arcing and carbon build up.

Ron Van Vliet

----- Original Message -----
From: <(email redacted)>
To: <(email redacted)>
Sent: July 14, 2002 2:20 PM
Subject: Re: Re: Do I need a new coil?


> Sorry....my first time here. I have a 1.6, GReddy turbo, and Link
ECUw/RC440s. Plugs(new) are gapped at .029 and I am using NGK wires(new). I
have checked ground connections, injector connections, O2 connections and
readings.
>
>
>
> Anyway, I am consistantly losing one cylinder at 5-6psi. It happened
suddenly one night. I was previously running up to 15psi without a problem.
>
>
>
> I had this problem before and I cleaned up the coils with alcohol and the
problem was solved.
>
>
>
> Thanks.
>

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Mail From: (email redacted)

About your coil misfire:

You can check for short inside the coils by checking the wires to the
coil: measure with an Ohm meter between the pins and the coil ouput
(where the plugs push in). If you compare the results of the two coils,
you may find that one coil as a continuity (short) and the other does not
have continuity between one wire pin and the coil output. That will
confirm the coil is fried internally.

Good luck
Ivica







(email redacted)
07/14/02 01:20 PM


To: (email redacted)
cc:
Subject: Re: Re: Do I need a new coil?




Sorry....my first time here. I have a 1.6, GReddy turbo, and Link
ECUw/RC440s. Plugs(new) are gapped at .029 and I am using NGK wires(new).
I have checked ground connections, injector connections, O2 connections
and readings.

Anyway, I am consistantly losing one cylinder at 5-6psi. It happened
suddenly one night. I was previously running up to 15psi without a
problem.

I had this problem before and I cleaned up the coils with alcohol and the
problem was solved.

Thanks.