[s-cars] Stumbling under acceleration.....probable boost leak?Or...

Calvin Craig calvinlc at earthlink.net
Mon Nov 30 23:32:49 PST 2009

Ditto on the plug boot comment, that was the last item that went out on my
UrS that caused a miss.

Before that it was the oriiginal coil packs, but that was like 5 years and
70k miles ago after the originals had lasted for 120k miles.  At that time
no good replacement alternatives were available so given the condition of
the coil pack wiring - all messed up and brittle - I just decided to bite
the bullet, pay $500 for 5 brand new coil packs and I have had 0 problems
since then from a coil pack perspective.  If history is any judge I have
another 50k miles or so to go prior to more coil pack problems.  At which
time, I may very well simply re-up the $500 and start the clock all over
again, provided I still have the car on the road in another 4 years.  I know
my experience may be counter to most lister's experience but I just wanted
to provide an alternate viewpoint of a possible way to fix a coil pack


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of djdawson2 at aol.com
Sent: Monday, November 30, 2009 9:57 AM
To: jim at almgt.com; s-car-list at audifans.com
Subject: Re: [s-cars] Stumbling under acceleration.....probable boost

 Your question #3:

That is the bitch about coil packs.  People can piss and moan all they want
to about 1.8 coil packs... but no matter how you look at it, they save you a
ton of money and frustration.  Plug and play... swap one $20 coil with a new
one and test.  Problem not solved... swap the new one into the next
cylinder.  Doing this with the OE setup is impossible, as installing one new
coil pack is a project by itself.

I would urge you to also replace the plug boots on your coils prior to
replacing any of them.  This is another common failure causing a misfire
under load/higher boost.

Good luck,

-----Original Message-----
From: Jim Fleischer <jim at almgt.com>
To: s-car-list at audifans.com
Sent: Mon, Nov 30, 2009 9:41 am
Subject: [s-cars] Stumbling under acceleration.....probable boost leak?

Hey guys,

Thank you for all the responses to my stumbling issue......after a long
week and a quick 1500 mile round trip t Eastern Kansas (not in the S) I'm
finally able to tart tracking down the issue.  Here's my plan of attack.....

1.  Will build a leak tester and check for leaks in the intake hoses.....

2.  If no leaks found, will check spark plugs and replace with NGK's as
suggested by Dave Dawson

3.  If that doesn't do it, then will go the coil pack route.  One question,
though.....if I am only experiencing issues at higher boost, but not during
normal idle, how can I tell when there is a "miss" at idle when swapping out

4.  If that fails, well.....I guess I'll post again and see what you all
have to
say before I, "gulp" take it to someone.....

Thanks all....I'll let you know what I find in the days to come.....

Best regards,

Jim Fleischer
'95 s6 avant
'83 ur
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