1983 Audi Coupe GT - Engine stalls on quick acceleration

[T E]

Take a look at the the crankcase/valvecover breather hoses.. Ive had one or 2 be plugged with oil.. They would close up and squeeze tight under full accel. It would affect idle and appear as a vacuum leak. Let us know.

 

Tony

 
> From: AUDICPGT at aol.com
> Date: Mon, 17 May 2010 17:07:22 -0400
> Subject: 1983 Audi Coupe GT - Engine stalls on quick acceleration
> To: quattro at audifans.com
> 
> 1983 Audi Coupe GT 2.2L I-5 Miles = approx. 220K
> 
> What started out as a random issue has now become a constant problem... as 
> follows:
> 
> Engine starts fine cold, idles fine also. Upon quick acceleration, engine 
> cuts-out, as if complete loss of fuel pressure, ignition spark or engine 
> vacuum dropping the fuel metering plate. If I stay in the pedal, the engine 
> will die... if I jump off the pedal and feather it, it will stay running. 
> On very easy acceleration, it will rev up normally to the redline.
> 
> I checked all my vacuum lines for leaks - cracks - looseness, sprayed some 
> starting fluid around connections... all seem fine, no spikes in idle. 
> Removing oil filler cap does make engine die.
> 
> I suspected plugged up fuel filters since I have been there before on 
> another vehicle of mine. I knew it had been at least 5 years, so I replaced 
> both filters, and also my fuel pump that has been louder as of late since 
> everything was disconnected anyway. I don't have a CIS fuel pressure test kit, 
> so I had no problem shot-gunning these replacements. Also, while I had 
> the filters disconnected, I checked the free-flow out of the fuel tank... it 
> was strong, no obstructions there.
> 
> Testing upon reassembly = No change!
> 
> I was advised to replace my fuel distributor (it had been seeping), so I 
> did w/ a rebuilt unit from Python.
> 
> NO CHANGE!
> 
> I suspected stuck open fuel injectors causing fuel pressure drop in 
> distributor... so, since I had never had them cleaned I decided to take them in 
> to Doctor Injector. The guy said that they were gunked up, but sprayed fine 
> now. I was optimistic.
> 
> Reinstalled injectors (new seals too) = NO CHANGE!
> 
> I wanted to check and see what happens with spark during the event. I 
> hooked up my timing light, find steady strobe on idle... rev'd up the engine 
> slowly, strobe sped up normally. From idle, quickly opened the throttle, 
> the strobe sped up, and when engine cut-out the strobe continued to pulse... 
> SO, I surmised that the ignition system is NOT the issue. Spark is being 
> generated at time of stall.
> 
> 
> I next considered waving the white flag and taking it to a shop that had 
> the proper fuel system diag equipment I didn't have... BUT FIRST...
> 
> 
> Years ago, I had another car that the Cat convertor disintegrated & 
> plugged up, creating huge back pressure to the engine. That car acted similar to 
> my GT's problem, and I wondered if this was the case, it could be causing 
> back pressure that would affect the fuel metering plate. I disconnected 
> the exhaust to inspect the Cat... it looked fine, I could easily see right 
> through it. Discouraged, I decided to run open-header to eliminate any 
> questions about the entire exhaust system...
> 
> NO CHANGE! Engine roared to life, idled fine, BUT cut-out on the snap 
> accelerations!
> 
> At this point I've reached that PUT-A-FORK-IN-ME-I'M-DONE stage. I feel 
> beaten (which rarely happens to me with my vehicles).
> 
> I found this forum, and decided to give it a shot before limping it to the 
> shop. The old GT has been a reliable commuter (keeping miles off my 
> Infiniti G35 Coupe), so I can only hope it is something simple I have 
> overlooked, and not expensive as to be cost prohibitive in fixing.
> 
> I thank you for withstanding my saga, and also for any ideas you may have 
> for me.
> 
> Christopher
> 
> 
> 
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