Question about GMC Sierra 1500

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My 1996 gmc was misfiring bad and had a loss of power going up hill so i replaced the plugs and fuel filter.when i hooked the battery up and tried to start it the engine turns over just fine but will not start

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  • billy wellington Nov 14, 2010

    hey thanks a million the coil was bad runs like new now. again thanks and i will put the word out about u guys to all my friends. have a great day.



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Hello Billy.

First thing is to check the ignition and fuel pressure.
Check for spark, a spark tester is ideal but a screwdriver pushed gently up inside the coil wire and held carefully to create a gap to a ground will do. (You may get a jolt this way).
If no spark the ignition system will need to be diagnosed.
Then you will need to check fuel pressure. Here you will need a proper gauge to check it.
You might find a valve on the fuel line to hook up to or you might need a special fitting to adapt into the fuel pressure line depending on your model/engine in your truck.
Not sure what engine you have so I will go with a 5.7 (the 5.0 has same specification, the 4.3 a couple pounds higher).
You will need minimum 56 PSI to allow the engine to start. It needs this much to push open a poppet valve to allow the fuel to get to the injectors.

Without more information it will be difficult to assist you further at this time.
Check that much out and then leave me a comment here.
I will check back here later.


Posted on Nov 13, 2010


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