ok so now it will crank fine with ingition key. But not getting any spark. Is there kind of test I can do on the ignition coils? I've tested and am getting power and ground to the wires to each side of coil packs. The relay to nelson wiring is clicking at was told it should be. Everything now has a good power and ground but no spark.
Any ideas to what to check would be great. Do these engines have any kind of module like the ones with distributors have? That would cause it not to have spark?
1996 GMC extended cab, 2003 5.3/auto
It sure sounds like VATS holding you up. Do you have access to someone with HPTuner software that can download your file and see if the VATS is turned off?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
There are two other things can can be holding up your spark, one is the cam position sensor on the top of the shortblock at the back behind the intake manifold, the other would be the crankshaft position sensor on the passenger side of the block around the starter location. If either are bad, not connected or have bad or broken wires the engine will not fire. I pinched the cam position sensor wires between the block and transmission bellhousing once and the truck wouldn't start. I then had to repair the wires since they were smashed beyond recognition when tightening the bellhousing.
Last edited by RedHeartbeat; 08-10-2008 at 11:08 AM.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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