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

[Theodore Chen]

Jim, are you going to use the NGK BKR7EIX plugs?

My car also hesitates under acceleration sometimes.  Most of the time it's strong, but there are a few times when it seems to hesitate and power is significantly reduced.  It is running the Bosch F5PDOR with maybe 15k miles on them, but that might not be enough to rule out the plugs, so I will try some other plugs before changing coils.

What's the current list consensus on the best coil upgrade?  I thought it would be the LS2 coil conversion, but I saw this on the EFI Express site:
http://www.efiexpress.com/catalog/product_info.php?products_id=18
*** NOTE: We've discovered that the ls2 coil kit
causes about 10% of UrS4/UrS6/S2's with stock ECUs to go into 'limp
home' mode after the first full boost pull. We are working on a fix for
this problem, but in the mean time the kit is being offered with the
caveat that if it doesn't work on your car we will refund your purchase
price minus shipping charges upon return of the parts within 30 days of
purchase. VEMS and other standalone ECUs do not appear to be affected
by this problem, nor does it seem to be specific to any motronic
chipsets. If you have any questions about the kit feel free to contact us***



----- Original Message ----
From: "djdawson2 at aol.com" <djdawson2 at aol.com>
To: jim at almgt.com; s-car-list at audifans.com
Sent: Mon, November 30, 2009 8:56:34 AM
Subject: Re: [s-cars] Stumbling under acceleration.....probable boost leak? Or...


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,
Dave





-----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? Or...


Hey guys,

Thank you for all the responses to my stumbling issue......after a long holiday 
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 the 
coils?

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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