Question about 1989 GMC C1500

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89 1500 will turn but won't fire

Last knight my 89 1500 2wd started spuddering like it wasnt getting fuel. i listened for the fuel pump and it works. i cleaned out the fuel filter. i have plenty of fuel going in and out of the throttle body. i didnt see any fuel sprayin from the throttle body so i poored some fuel in to see if i could get it to fire. still nothing. so i checked to see if the spark plugs had spark they were fine too. so as far as i know it is getting fuel, spark, and oxygen. im stumped. what do i do next? please help.

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Could be bad crankshaft pisition sensor, usually is that sensor, or at least some type of sensor. All a car need is spark, fuel, and o2. So if you have all of these things, than you most likely have a bad sensor. Have you pulled each plug individually and tested for spark?
If you got good spark, and you are getting plenty of fuel to throttle body, than you may want to check your timing. You can test all your sensors and wiring with an ohmeter to check resistance. Place one probe on one side and the other on the other side while in OHM setting. If everything is good, you will get a reading, if the sensor is bad than you won't get a reading.

Posted on Mar 11, 2009


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