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fastfredracing's Avatar
 
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 6,023
964 running rich

I have a freinds 1989 964 c4 that came in the shop this week. , His complaint is that is that the car ,under light throttle, after it is warm, will fall on its face, and nearly stall. I had it running yesterday, and although it reved ok, it idled terribly, this morning, it would not even start, sounded like only a couple cylinders were firing, I pulled the plugs, and they are black and sooty, I will change them in the am, and hopefully it will run again,. There is black soot all around the tail pipe area of the bumper, so I am assuming that it is running rich. He said that the car ran real well until it has been running for about 30 min, and then it would act up. Since I cannot scan this car , I will have to check all the senors manually , so any tips that could save time would be helpful. I have verified that fuel pressure is 51 psi.. I will monitor 02 sensor operation , and air flow meter readings once I get it up and running again. I am thinking temp sensor, O2, or afm, any other thoughts???? He says that the car pulls like a frieght train under full throttle, and that it only acts up under light throttle , at cruise speeds on the freeway. I mostly play with older porsche, and unfortunately Porsche and Volvo are the only two cars that I do not have acces into their computers. ( time to upgrade)
Thanks
Fred
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Old 05-30-2007, 02:55 PM
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AFJuvat's Avatar
 
Join Date: Feb 2001
Location: Viera FL
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I'm betting that he has a sticky injector or two.

Put a noid light on the injectors and see what kind of pulse you are getting. I've seen a few with bad DMEs that kept the injectors open for excessive periods of time that had symptoms similar to this.
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Old 05-31-2007, 03:24 AM
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