C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Yesterday | 11:46 PM
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Originally Posted by CorvetteRules
I also believe in the measure twice cut once philosophy so plan on visiting them and finding out what device was actually used to pull that code and have them use it to show me. Although the fact that it just cranks and has fuel pressure does point to an ignition problem.
I am very late to the party here but if you now think it is an ignition problem then I would forget all the code stuff and go back to basics - an old fashioned test for spark (or the new fashioned test that I just googled for an Optispark) and go from there.

Last edited by Gary TCB; Yesterday at 11:53 PM. Reason: clarification
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Old Today | 10:45 AM
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Originally Posted by Gary TCB
I am very late to the party here but if you now think it is an ignition problem then I would forget all the code stuff and go back to basics - an old fashioned test for spark (or the new fashioned test that I just googled for an Optispark) and go from there.
The fact that the car went from running great with easy starting to only cranking with no firing at all shows there is zero spark at the plugs. Based on that either the the Opti isn't sending spark to the plugs or the ECM/PCM isn't sending signal for spark. You mention a "new fashioned test", can you elaborate on that test for opti?
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