Question about 1999 GMC Sierra

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I replaced the ignition control module in my 99 GMC Sierra 2500. It still will not start. It turns over but wont start. Checked the fuses and the distributor and the coil. What else can I look for? The fuel pump is working and the fuel regulator has the required pressure.

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Check the spark plugs, if it still produce the required
spark enough to start your engine.

Posted on Oct 01, 2009

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Check for injector pulse and for compression

Posted on Oct 01, 2009

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I replaced the fuel pump relay, noticed that i had a blown fuse marked ecm. repaced that.ran truck for around 20 min.turned off. when i went to start again it wouldnt. looked at that same 20 amp fuse


There are two ECM fuses - marked ecm 1 and ecm B.
ECM B powers the fuel pump and the Veh control module which handles most of the sensors.
ECM 1 powers the ignition module, coil, injectors and the rest of the engine sensors.
You may need a repair book with diagrams to check all of the circuits for shorts.

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