Question about Geo Prizm

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Car died at stop light and now will not start. We replaced the Ignition module and it still will not start. Could it be the crank sensor? If so where is it on the car? The car is a 1991 Geo Prizm, 4cyl. 5 speed.

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  • dtorguson Nov 12, 2009

    There is spark and it does turn over so what else could it be?


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If it is it will likely show up by running code diagnostics. Here is where I would start. Your problem is either fuel related, spark related, or a compression/timing issue. And yes, these problems can be caused by sensors. Does the engine turn over? If so, you can run some preliminary diagnostics to narrow the problem down, rather than spending money on parts changing. The description is consistant with what would happen if your timing belt broke...check that first. If that is good, then you eliminate the compression/timing problem from the equation. Next see that you have spark to all cylinders...if you do, then it is a fuel system related problem, if you don't then you'll need to diagnose your spark issue. Good Luck. Hope this is helpful. Let me know which way is headed and I can asist further if needed.

Posted on Nov 12, 2009

  • Hal Hallman Nov 12, 2009

    Have you verified that the timing belt is in tact? If not, that is the problem. If it is, then you have a fuel related problem. You have sensors that detect engine temp, outside temp, humidity, and air pressure..(for altitude), to give you the perfect fuel air mix for the situation that prevails. You are probably either not getting fuel at all, or are not getting a combustable mix. To that end, you would need to determine if your fuel pump is working and if you are getting fuel to the cylinders. If you find that your fuel pump is working properly, the next step would be to run code diagnostics to see if you have a sensor issue. Good Luck, and thanks for the feedback, you are narrowing it down!


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