[s-cars] S4 bucking under WOT - what else?

Emre Washburn yumyjager at gmail.com
Fri Sep 23 07:50:19 EDT 2005

Sounds just like my second MAF failure (second in 1 1/2 years BTW). I tried
borrowed coils, borrowed POSs, car already had new spark plug/spark plug
boots, also new o2, etc. Decided to try a MAF (if you do as well, rest the
ECU before you go for a drive). See if someone here will send you a stock
one to borrow if they have upgraded.

92 //S4
90 Cq
40 valves 'O plenty!

On 9/22/05, Ivan Demkovitch <idemkovitch at hotmail.com> wrote:
> Folks,
> 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
> become regular.
> 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
> blow.
> 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
> show anything.
> What else..
> 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?
> Read archives.
> Cleaned up MAF connector. I _think_ it improved a little. But this is not
> for sure.
> 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!
> Ivan
> 93' S4
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