Question about 1992 Buick Century

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Not getting fire after serpentine belt break......fires with starting fuel

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This one sounds tricky but I have a few suggestions. Here is how I suggest going about figuring this out. The first thing that I would check is for any obvious damage that the serpentine belt breaking off may have caused. I am thinking that the belt breaking off may have damaged the crankshaft position sensor. This sensor is responsible for telling the vehicles computer (which controls fuel injection) where the engine is at in its rotation so it knows which cylinder needs to be fired off next in the firing order. This sensor is located right behind the crankshaft pulley/Harmonic Balancer. It seems to me like it would not take much to have a broken belt whip around and possibly bust the connector off or even break the sensor. It may be difficult to visually see it and could require removing the pulley which will require a special puller that can be rented from most auto parts store. If everything I mentioned is in good shape then I would dis-regard the belt breaking at this time and begin diagnostics on the fuel pump. Some questions that will need to be answered are is there 12 volts at the fuel pump electrical connector when cranking. If so, I would replace the fuel pump. If not then the computer is not signaling the pump to turn on and you will have to check the wiring from the pump to the computer and the fuel pump relay. Let me know what you come up with and I will be happy to provide some more insight. Good Luck!

Posted on Mar 22, 2011


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