Quote:
Originally Posted by 99-LS1-SS
I have the ZZ502 HEI setup. I replaced the ignition module and it still won't start. I turn the key and it turns the motor over fine and after a few second of turning it backfires really loudly...
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to me, the backfiring indicates that you most likely do have spark. it still could be fuel (flooding) or ignition. like cableguy0 said, don't just throw parts at it. the sudden shut-off also suggests electrical
always do the easy checks first. no sense pulling valve covers (or other parts) 'til you need to.
I'd bring the engine to TDC #1 (compression stroke, finger on the hole method) and see if the rotor is pointing at the right place on the cap
if that looks okay, pull all the plugs and dry them and spin the motor over to clear the cylinders of any raw gas.
when you're ready to restart, give it a couple of pumps but don't keep pumping if it doesn't fire right up