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

C4 will turn, but will not start

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Old Aug 17, 2008 | 10:52 AM
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Default C4 will turn, but will not start

Went to crank my C4 this morning but something bad must have happened. The engine will turn over, but will not start. There are no error codes in the CCM (except for C12).

I suspect the ICM again, since I replaced it already several months ago. But the fact that there are no error codes makes me think it could be something else.

Any feedback as to the source of this problem is appreciated.

Thanks!
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Old Aug 17, 2008 | 10:56 AM
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Originally Posted by ceberus
Went to crank my C4 this morning but something bad must have happened. The engine will turn over, but will not start. There are no error codes in the CCM (except for C12).

I suspect the ICM again, since I replaced it already several months ago. But the fact that there are no error codes makes me think it could be something else.

Any feedback as to the source of this problem is appreciated.

Thanks!
before you waste alot of time. Please ohm check those multecs, If one has a dead short it will shut down the injector drivers. Post the results. If any are below 10 ohms. Disconect that injector and see if she fires up.. you can start the car on 7 injectors. If two are shorted you can also start on 6 but don't let it get hot.
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Old Aug 17, 2008 | 11:17 AM
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My C4 is a 1992, I believe GM stopped using the Multec injectors in 1991?
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Old Aug 17, 2008 | 11:26 AM
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Have you checked for spark ?

Have you checked your fuel pressure?

Start with the simple things...then move on to the more complex.

<air><fuel><spark>

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Old Aug 17, 2008 | 11:30 AM
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Default no start

check fuses.
if an injector fuse is blown, then check all the injector resistances.
Then check for the obvious, bad fusible links, fuel pressure, etc.
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Old Aug 17, 2008 | 11:33 AM
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Now I am getting H41 and H72 from the CCM.
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Old Aug 17, 2008 | 12:33 PM
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H41 EST circuit voltage was above 4.6 volts when engine speed was under 1500 RPM

H72 2nd or 3rd gear switch was open for 1.5 seconds when vehicle speed was above 30 MPH with engine speed greater than 5000 RPM and a throttle angle above 70%.
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Old Aug 17, 2008 | 01:10 PM
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Will feathering the gas make a difference?
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Old Aug 17, 2008 | 02:24 PM
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Originally Posted by ceberus
My C4 is a 1992, I believe GM stopped using the Multec injectors in 1991?
no Gm stopped the multec 1 in 93 and began using the multec 2 in 94-96
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