[s-cars] Procedure for testing coil, hesitation under boost.

[Tom Green]

Date: Tue, 17 Aug 2004 22:39:06 -0700 (PDT)
From: Ira Deere <iravwaudiporsche at yahoo.com>
Subject: [s-cars] Procedure for testing coil,  hesitation under boost.
To: S-CAR-List at audifans.com
Message-ID: <20040818053906.97060.qmail at web61004.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii



I've swapped out known good coils from '92 S4, hesitaton gone.  How do 
I trouble shoot coils to find the bad one.  I've checked resistance and 
all are the same.  The #5 coil has been replaced previously.  Thanks
Ira
'93 S4 for sale 6000

Ira,

I was hoping someone would give you a lead to a comprehensive 
proceedure for this problem.  I recommend checking the archives at 
audifans and even audiworld.  SJM autotechnic always has some good help 
also.  You could also call SJM also for technical advice (and parts).
I know of several owners that have wound up replacing all 5 coils, one 
at a time, while chasing this problem, and then replace both POS, and 
plugs and boots and never have a clue what the original problem was.
Sounds like the access to a good coil set has done a good job of 
troubleshooting for you.  You can examine your coil set under bright 
light and magnification, looking for shorts in the wiring, arcing at 
grounds, whitish deposits around bolts, black or white deposits on 
wiring, but much of this observation has been done in hindsight, the 
problem coil found by elimination, and then the telltale evidence 
found.
Megging the coils is the only test that I know of, and the difference 
can be small, or none, except under boost.  HTH

Tom '95 S6, in Knoxville, TN