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940 does not start. 900

Hi everyone.
I have a major problem. My 1993 940 (Non-Turbo)will not start. I drove this car to work yesterday morning with no signs of any problems. At the end of the day, car will not start. It has nothing to do with the battery because it turns good, and to be sure, I had it jumped. No start.
Where do I start? Compression test? Any advise would be appreciated.

Dauda








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    940 does not start. 900

    There's always the ultra-slim chance that the timing belt broke broke just as you shut off the engine - I've seen it happen before. To eliminate the possibility though, open the oil filler cap and have someone crank the engine over while you watch the cam turn. OK, now that we know the timing belt is OK, it's time to move on to the things that REALLY go wrong.....

    There's a 99.999% chance that your problem is either the Fuel Pump Relay, Radio Suppression Relay, or RPM Sensor.

    If you don't hear the fuel pump run for a second or two when you first turn on the ignition, suspect the fuel pump relay.

    If you DO hear the pump run for a second, suspect either the Radio Suppression Relay or the RPM Sensor. (You can turn the ignition on and off a couple times and then loosen the fuel line fitting just a little on the high-pressure side of the fuel injector rail and if fuel sprays out in your face then there is probably nothing wrong with the fuel pump or fuel pump relay.

    If you don't get spark or a slight quivering of the tachometer needle while cranking the engine, suspect the RPM Sensor. If it's bad, you "should" get a 2-1-4 fault code, but don't always count on it.

    If you have good fuel pressure and good spark, suspect the Radio Suppression Relay. You can swap the wire leads between it and the identical Aux Fan Relay as a test.

    That's pretty much the whole troubleshooting procedure in a nut shell.








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      940 does not start. 900

      I have checked the timing belt, it is OK. I hear the pump run when I turn the ignition on. I will be checking the Radio Suppression Relay and the RPM sensor next. One thing I found strange is, there is no fuel coming into the fuel rail. I must be looking at the wrong place. I am going back out to verify everything again.
      Thanks.

      Dauda








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    940 does not start. 900

    There are a number of things, mostly electrical which can cause a no-start condition. A compression test would likely not tell you anything useful in this case. My '93 940 NA had a no-start condition and the problem was the crank position sensor. Other possibilities are the fuel pump relay, the radio interference relay, probably others. Can you hear the pump come on briefly when you turn on the key? If so, the fuel pump relay is probably ok.

    Check the FAQs for lots of great help:

    http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm#Start_or_Stall_Problems







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