Question about GMC Cars & Trucks
The engine will turn over but want start there is no spark can anybody tell me what could be all the causes why there is no spark at the spark plugs boots and what all i need to check? where are the fuses box located at inside the vehicle? please help me
Usually no spark is one of the following: bad ignition coils, bad ignition control module (ICM- probably located underneath the coil pack), Crank position sensor, and camshaft position sensor. Also, the computer- PCM, but this is rare.
Other things, too, but often one of the above. Now if you happen to blow a maxi-fuse, that could also cause no spark, if the fuse controlled some part of the ignition system. Good idea to check all fuses on the car, but the main ones with running the engine are the maxi-fuses under the hood. I don't think any fuses inside, like under the dash, would affect or cause a no start, no spark condition. Just check the main large fuses in the Power Distribution Box- may have a cover on it, with location and function of all the relays and fuses in that box.
Probably the first thing to check would be the Ignition Control Module. Parts stores can test these for free, if you bring it to them. Mechanics would use a voltmeter when checking electrical circuits, can't test or check much without one.
Posted on Dec 03, 2016
This is most likely the crankshaft sensor, It tells the ECM when to fire the plugs. The sensor is on the block visible on the drivers side through the wheel well of from under the truck
Posted on Dec 03, 2016
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Posted on Jan 02, 2017
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