[s-cars] Diagnosing misfire cause

[Peter Golledge]

Likely heat related... a carefully used heat gun can induce thermal failure
and allow you diagnose.  Similarly "freeze spray" (I use inverted canned
air) can confirm "cure" on a hot engine component which is playing up.

On Wed, Dec 30, 2015 at 4:32 PM, Tom Rodriguez <trodri69 at gmail.com> wrote:

> Folks,
>
>
>
> My '95 S6 is misfiring intermittently and I am trying to determine the
> cause.  When it misfires, it does so constantly at all engine speeds and
> under all levels of acceleration & boost, including at idle.  On some days
> the car starts well and runs well for a while, then begins misfiring once
> warm.  On other days it misfires when cold, and then clears up once warm.
>
>
>
> I've read the technical advice provided at SJM Autotechnik on this subject,
> which points to either a bad ignition coil, a bad POS, or a bad fuel
> injector.  They also mention dirty plugs but mine look fine.
>
>
>
> My problem is that every time I try to diagnose the cause, the engine
> refuses to misfire.  When it does misfire, I am not in a place where I can
> do any diagnostics.  It's very frustrating.  I'm hesitant to drive the car
> any long distances until I figure this out.
>
>
>
> Thanks for any advice,
>
>
>
> Tom
>
>
>
> Tom Rodriguez
>
> '95 S6, 267k miles
>
>
>
>
>
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