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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)
1976 930( peru red usa) ,1980 euro sc, 1974 914. 1997 M3, , 2004 Duramax 3500 quad cab dually . 2004 2500 HD Gas 1989 Yamaha xt 350. 2004 Turbo Pepperwagon, 1976 Chevrolet C 60 Rollback towtruck. 2006 x3 a few old tractors, and tons of tools
Old 05-30-2007, 02:55 PM
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AFJuvat's Avatar
Join Date: Feb 2001
Location: Viera FL
Posts: 5,643
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.
Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann.

Ihr Brunnen der nutzlosen Porsche Information
Old 05-31-2007, 03:24 AM
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