[s-cars] S-CAR Bucking under WOT - SOLVED!

[chris chambers]

Ivan,

Glad to hear you got it fixed, I bet it feels good to be able to
hit the boost again!


Good job
Chris



--- Ivan Demkovitch <idemkovitch at hotmail.com> wrote:

> List,
> 
> Attached on a bottom my original problem.
> 
> Huge thanks to Chris Chambers who agreed to test my coil pack and
> MAF.
> When I got parts back I knew that I have bad coil pack.
> 
> Then it was time to decide if I want to do 1.8T conversion or I need
> to buy 
> 1 new coil.
> I decided to go with new coil and got it + 4 new coil connectors for
> ~$130
> 
> Tried to troubleshoot bad coil by unplugging injectors and driving
> around, 
> but engine wouldn't build enough boost and car vibrates so badly that
> you 
> can't tell if it's 4 or 3 cylinders working :)
> 
> Then I tried spark tester test again and it worked. The trick is to
> be 
> patient. First time I was testing while doing vodka shots with my
> friend and 
> presence of "spark" was good enough for me.
> 
> This time I counted 10 sparks on each coil. This is very important
> because 
> you can see how often they go and get a feel. Then I increased gap
> and one 
> coil missed 3 out of 10 sparks. It was on cylinder 4.
> 
> 30 minutes later I was about to get tickets on highway. Lots of boost
> and 
> car drives like never before.
> 
> Ivan
> 93' S4
> 
> 
> 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.
> 
> 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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