Question about 1989 GMC Sierra

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My GMC Sierra turns over but will not crank, I've put a new distributor cap on, and a coil, still will not crank. Do this truck have a computer?

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  • GMC Master
  • 8,836 Answers

Yes, it has a computer and the crankshaft sensor is a possible cause, but I recommend you do some standard troubleshooting before thinking about the computer--check for spark and fuel, etc.

Please see my tip at http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Nov 06, 2010

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What brand of distributor cap did you use? When you say it won't crank, do you mean it won't even turn over? Or just turn over and not start up?

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try changing the spark plugs and spark plug wires that may help...but first to be sure try following the ignition system from top to bottom...first try holding a spark plug wire half an inch away from your engine block and let somebody else try cranking the engine if you can't see a spark then try that with the wire connecting the coil with the distributor if there is still no spark than the coil needs to be changed

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