[s-cars] Re: Missing under Accelleration

[Calvin & Diana Craig]

If you have a meter that reads really high impedances (giga-ohms) you can
check each coil secondary with the meter and usually the bad one/ones will
have a higher impedance than the others by about a factor of 10.  Usually
you have to get a Fluke style meter with nanosiemens (the inverse of
giga-ohms) on it to be able to read this.  in this case you would be looking
for the low conductivity number.  Since it only misses under load I would
not suspect POS as the first suspect.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Ghost
Sent: Saturday, March 27, 2004 11:10 AM
To: s-car-list at audifans.com
Subject: [s-cars] Re: Missing under Accelleration


Greetings All,

Richard reports a miss at WOT:

> Grr, my S4 has an issue.  Under WOT accelleration
> she's misfiring and stumbling, not ALL the time but
> MOST of the time.  I checked for vac leaks already.
> Any way I can test my coils or POS's to see if they're
> bad?  My plugs and plug leads have only about 10k on
> them, and I changed my valve cover gasket to stop oil
> entry to the plug holes.  Im sure plenty of you have
> BTDT on this problem...

I would run through the normal process of elimination for the
possibility of a bad coil. Buy one good coil and swap it to each
cylinder and see if the miss goes away.

Before you do that, however, do the easy stuff.  Replace your plugs,
connector boots, and fuel filter (just in case it's starved for fuel).

I'm trying to solve the same problem before a rapidly approaching
appointment on a track.

Best regards,

Paul

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