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

Cranks but won't start

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Old 06-21-2015, 08:55 AM
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Dquigley83
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Default Cranks but won't start

I have a 1993 with the lt1 in it and I am getting fuel but no spark. It cranks but won't fire any suggestions before I start replacing stuff that doesn't need replaced.
Old 06-21-2015, 09:01 AM
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antfarmer2
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Originally Posted by Dquigley83
I have a 1993 with the lt1 in it and I am getting fuel but no spark. It cranks but won't fire any suggestions before I start replacing stuff that doesn't need replaced.
Check and clean your ground on ICM.
Old 06-21-2015, 09:07 AM
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Dquigley83
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Ok I'll check that today. Could the opti spark possible have gone bad?
Old 06-21-2015, 09:15 AM
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antfarmer2
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Originally Posted by Dquigley83
Ok I'll check that today. Could the opti spark possible have gone bad?
Yes but rule everything out first wires ,coil, icm and kid giggeling in the bushes. If kid is found use his finger as a tester.
Old 06-21-2015, 09:50 AM
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don hall
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Originally Posted by Dquigley83
.....Could the opti spark possible have gone bad?
Yes.

If you have a V/O meter, this link will provide
instructions to test the opti:

https://www.corvetteforum.com/forums...ls-to-ecm.html
Old 06-21-2015, 09:54 AM
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Could be a corroded pin in one of the connectors. It's possible that your ignition module is bad. It can be tested at most auto parts stores.

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