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Car Forum / Porsche / Porshe 944 / November 2003Help Diagnosing '83 944 Performance Problem
Hi All! My '83 944 always starts up and runs fine with one exception. At times the engine will sputter when it hits approximately 4k RPM or above. I have a 5 speed so it is usually easy enough to avoid the higher revs but would like to find and fix the cause of this problem. The engine runs find if I just back it down from this RPM range. The problem is sporadic but does seem to appear on a fairly consistent basis. Does anyone have any suggestions on what to check first? Does this sound like a fuel or electrical problem? Any feedback would be appreciated. Cheers! My '83 944 always starts up and runs fine with one exception. At times the engine will sputter when it hits approximately 4k RPM or above. I have a 5 speed so it is usually easy enough to avoid the higher revs but would like to find and fix the cause of this problem. The engine runs find if I just back it down from this RPM range. The problem is sporadic but does seem to appear on a fairly consistent basis. Does anyone have any suggestions on what to check first? Does this sound like a fuel or electrical problem? Any feedback would be appreciated. Cheers! Search the web, it happens to more people. In my case it was a burned out ground connection in the DME. Other people had a faulty DME relais. It also can be a dirty fuel filter, bad fuel pump, bad pressure regulator etc. etc. good luck , Paul I've had that happen on my 83 944 and it turned out to be one the speed/ref sensors located on the flywheel housing. The reason I was able to conclusively isolate the problem to one of them is that, after first time the engine started missing, one of them failed completely about a week later. The engine won't run without both of them working. They are easy to check by unplugging each one and measuring across the plug with an ohm meter. They should read about 1k ohms. They cost about $100 each. There are actually 3 prongs in the plug, try all combinations. All will read open except the 1k ohm one. Mike > Hi All! > [quoted text clipped - 21 lines] > > Cheers! Didn't even know I had sensors there! I'll have to check them out.... Thanks! Sounds like fuel pressure problem. Get a pressure gauge and hook to end of fuel rail. Should see at least 30 psi. Then pinch on the fuel return line. Pressure should go up to 60 psi at least. If not then new fuel pump and pressure regulator in order. |
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