Miatapower List Archive

This read-only message was archived from a public mail list.
Mail From: (email redacted) (Skip Cannon)


I installed a well used (~150k mile) coil pack and used Mazda plug wires
(~20k miles) this evening. First time on the boost (180 kpa) and the
difference is obvious. The miss is gone and the engine is far more
powerful and smoother to boot. I upped the boost to 200 kpa and yahoo, the
fun is back. What I have thought was wastegate flutter for awhile was
apparently a lower level of misfire. Anyway, the flutter is gone.

Being the curious type, I got to wondering whether it was the wires or coil
pack so I came back and put the Magnecor wires on cylinders 1 & 4, the ones
causing the problem. The first time into the boost and the miss was back.

With the coil pack out of the car I was able to get a better look down
inside the connectors for the plug wires. Looking at 2 & 3, I discovered
that one connector is silver colored and one is brass colored.

On the 1 & 4 coil, I had assumed both started out as brass and the inner
one had burned away. However, close inspection reveals the contact area is
intact, just dirty. I measured resistance on both coil packs. Secondary
coils are within the Mazda spec, however, both sets of primaries have
slightly higher resistance than the spec. Easily within the noise level of
the meter (and tester) and both have nearly identical readings so I think I
will put the original coil pack back in when I put on the new Accel wires
tomorrow and see what happens.

Skip Cannon

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


Skip-

How dirty is the insulation on the Magnecores?

I had a high boost misfire a couple months ago and
regapped the plugs (large plug gaps being the usual
culprit). When that didn't solve it, I took a look at
the Magnecore wires and remembered a post from a while
back about cleaning the insulation on each wire. 30
minutes, some Simple Green, and a toothbrush = misfire
gone. I guess the crud that collects on the wires is
conductive?

Maybe you tried this already, but it worked for me.

Chris King
93C Turbo
San Anselmo, CA

--- Skip Cannon <(email redacted)> wrote:
>
> I installed a well used (~150k mile) coil pack and
> used Mazda plug wires
> (~20k miles) this evening. First time on the boost
> (180 kpa) and the
> difference is obvious. The miss is gone and the
> engine is far more
> powerful and smoother to boot. I upped the boost to
> 200 kpa and yahoo, the
> fun is back. What I have thought was wastegate
> flutter for awhile was
> apparently a lower level of misfire. Anyway, the
> flutter is gone.
>
> Being the curious type, I got to wondering whether
> it was the wires or coil
> pack so I came back and put the Magnecor wires on
> cylinders 1 & 4, the ones
> causing the problem. The first time into the boost
> and the miss was back.
>
> With the coil pack out of the car I was able to get
> a better look down
> inside the connectors for the plug wires. Looking
> at 2 & 3, I discovered
> that one connector is silver colored and one is
> brass colored.
>
> On the 1 & 4 coil, I had assumed both started out as
> brass and the inner
> one had burned away. However, close inspection
> reveals the contact area is
> intact, just dirty. I measured resistance on both
> coil packs. Secondary
> coils are within the Mazda spec, however, both sets
> of primaries have
> slightly higher resistance than the spec. Easily
> within the noise level of
> the meter (and tester) and both have nearly
> identical readings so I think I
> will put the original coil pack back in when I put
> on the new Accel wires
> tomorrow and see what happens.
>
> Skip Cannon
>
>
>

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This read-only message was archived from a public mail list.
Mail From: (email redacted) (Skip Cannon)


Chris,

The wires look like new. Nothing building up on the outside. I didn't
think to try cleaning them.

Skip


>Skip-
>
>How dirty is the insulation on the Magnecores?
>
>I had a high boost misfire a couple months ago and
>regapped the plugs (large plug gaps being the usual
>culprit). When that didn't solve it, I took a look at
>the Magnecore wires and remembered a post from a while
>back about cleaning the insulation on each wire. 30
>minutes, some Simple Green, and a toothbrush = misfire
>gone. I guess the crud that collects on the wires is
>conductive?
>
>Maybe you tried this already, but it worked for me.
>
>Chris King
>93C Turbo
>San Anselmo, CA
>
>--- Skip Cannon <(email redacted)> wrote:
>>
>> I installed a well used (~150k mile) coil pack and
>> used Mazda plug wires
>> (~20k miles) this evening. First time on the boost
>> (180 kpa) and the
>> difference is obvious. The miss is gone and the
>> engine is far more
>> powerful and smoother to boot. I upped the boost to
>> 200 kpa and yahoo, the
>> fun is back. What I have thought was wastegate
>> flutter for awhile was
>> apparently a lower level of misfire. Anyway, the
>> flutter is gone.
>>
>> Being the curious type, I got to wondering whether
>> it was the wires or coil
>> pack so I came back and put the Magnecor wires on
>> cylinders 1 & 4, the ones
>> causing the problem. The first time into the boost
>> and the miss was back.
>>
>> With the coil pack out of the car I was able to get
>> a better look down
>> inside the connectors for the plug wires. Looking
>> at 2 & 3, I discovered
>> that one connector is silver colored and one is
>> brass colored.
>>
>> On the 1 & 4 coil, I had assumed both started out as
>> brass and the inner
>> one had burned away. However, close inspection
>> reveals the contact area is
>> intact, just dirty. I measured resistance on both
>> coil packs. Secondary
>> coils are within the Mazda spec, however, both sets
>> of primaries have
>> slightly higher resistance than the spec. Easily
>> within the noise level of
>> the meter (and tester) and both have nearly
>> identical readings so I think I
>> will put the original coil pack back in when I put
>> on the new Accel wires
>> tomorrow and see what happens.
>>
>> Skip Cannon
>>
>>
>>
>
>__________________________________________________
>Do You Yahoo!?
>Talk to your friends online with Yahoo! Messenger.
>im.yahoo.com