[s-cars] S4 bucking under WOT - what else?
idemkovitch at hotmail.com
Thu Sep 22 23:53:40 EDT 2005
Same problem keep bugging me. Any time under WOT car would surge violently
when boost starting to build up. Sometimes it would be just 1-2 surges and
then it accelerate just fine and other time it will surge without letting me
go fast :)
If I accelerate slowly - car gets up to speed just fine.
It used to be intermittant problem but within last month it started to
What I had done (thanks to advices here):
1. Replaced spark plugs
2. Replaced air and fuel filters.
3. Tested coils using "spark tester" test. All coils tested out fine with
similar gap. Maybe 1 turn difference.
Yesterday I had to buy compressor (good excuse for wife and starting point
to collect air tools :)
Tested intake for leaks today.
1. Connected 3' PVC plug to hose from MAF to pressurise all intake.
2. Got huge leak from oil cap
3. Read archives
4. Plug hose to valve cover
5. Pressurise again.
6. Got very big intake(MAF->Turbo) hose. Yes, it was inflated and ready to
7. No sign of obvius leaks. Can't really test because was scared of that
hose to blow up. 10 psi didn't show anything. 15-20psi quick check didn't
I have that "rattle snake" sound when let off gas. Thought it somewhat
normal but apparently its not.
When I removed hose from MAF it had some oil in it. Looks like protective
screen on MAF was wet. Is it normal?
Cleaned up MAF connector. I _think_ it improved a little. But this is not
Anyway. I stuck with what I have and have no idea what to do next.
If it's MAF - then I need to try good one before buying ($$$)
If it's coils - I'd rather go with 1.8 coils setup.
Anyway - don't want to spend money to replace different parts. I'm sure
there is better way.
Any pointers on what do I need
Thanks for advice!
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