1992 Porsche 968 Q&A

1992 Porsche 968 Question: Will not start even though fuel pump has been replaced

968 started and ran fine after installing new fuel pump. Now it will not start. I have spark and fuel. Is there a sensor that sends fuel to the injectors? If so where is it? -
Answer 1
The easiest way to check the function of the fuel injectors electronic signal is by the use of a "noid light". They can be purchased at an auto parks shop or tool retailer. It should plug right into the wire connector of the fuel injector. If you see the light flash when you try to start the car then it's getting the signal it needs to pulse. If the light does not flash then check the function of the crankshaft and/or cam shaft position sensor. Also, you may want to check the ECU for codes and check the function of the mass air flow sensor. -
Answer 2
Check the DME relay and the Temprature sensor unit. If either one is faulty they will send the wrong information to the computer and you will have starting problems. It took me 18 months to find this out. Stilly 50 -