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89Carrera
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My car has a similar but not identical problem. My 89 Carrera bucks when warm. It feels like the engine is cutting out or running on less than 6 cylinders. The problem exists only when coasting on a light throttle. There is no hint of a problem when the car is accelerating. Oddly enough the problem also disappears at exactly 2000 rpm. The problem occurs above or below 2000rpm. I have owned the car for 10 years, it now has 96k miles and has been well maintained. I have spent a bunch of money at some great Porsche shops and none have been able to fix. Work done so far: Replaced: injectors, DME relay, cams reset, valves adj, spark plugs, ignition wires, distributor cap & roter Tested (parts swapped): Ignition coil, air flow meter, temp sensor, motronic control unit, air box Other Tests: compression test (160-175), fuel pressure, engine vacuum leak, injection and top end fuel system clean, engine "leak down" test (all cylinders are 2-3%), cylinder head temp, exhaust cylinder temp (1 cylinder runs cooler?), exhaust back pressure, exhaust analyzer indicates lean mix below 2000rpm, heat exchanger, battery, DME pickups, air flow meter, altitude sensor
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........clutch was replaced some time ago and before the problem started.........flywheel is an interesting thought although I think the fact that the engine has the same symptoms when the car is stopped with the engine running on idle probably indicates this is not the prob.......tell me more if I missed the point....and thanks for the suggestion.
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Thanks for the reply........we tried new parts for both and it made no difference......
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My 89 Carrera bucks when warm. It feels like the engine is cutting out or running on less than 6 cylinders. The problem exists only when coasting on a light throttle. There is no hint of a problem when the car is accelerating. Oddly enough the problem also disappears at exactly 2000 rpm. The problem occurs above or below 2000rpm. I have owned the car for 10 years, it now has 96k miles and has been well maintained. I have spent a bunch of money at some great Porsche shops and none have been able to fix. Any suggestions? Work done so far: Replaced: injectors, DME relay, cams reset, valves adj, spark plugs, ignition wires, distributor cap & rotter Tested (parts swapped): Ignition coil, air flow meter, temp sensor, motronic control unit, air box Other Tests: compression test (160-175), fuel pressure, engine vacuum leak, injection and top end fuel system clean, engine "leak down" test (all cylinders are 2-3%), cylinder head temp, exhaust cylinder temp (1 cylinder runs cooler?), exhaust back pressure, exhaust analyzer indicates lean mix below 2000rpm, heat exchanger, battery, DME pickups, air flow meter, altitude sensor