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

Car won't start after getting warm

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Old May 2, 2012 | 07:38 AM
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Default Car won't start after getting warm

I recently got a problem with the car engine not turning over after becoming warm. Once jumper cables put on battery engine starts. Battery wasn't holding a charge so had it changed, wasn't more than two days after changing the battery and the problem occurred again. The battery terminals connections okay as just had battery changed, and connection to starter okay also. I was informed that the problem could be with the Clutch Switch and I should bypass it. Curious to know if any one has heard of this to be the problem with a no start. Thank You.
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Old May 2, 2012 | 07:55 PM
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Your post is kinda confusing. Is the battery going dead? Or is the car just refusing to crank over? Or is it cranking but not starting?
You use the terminology loosely and (for me at least) this makes your description confusing.

Whom ever told you to bypass the clutch switch.......RUN, they should not be anywhere near your car. That is a safety item. Only an idiot would by pass that switch. I cannot think of any legitimate reason to bypass a clutch switch.
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Old May 2, 2012 | 08:46 PM
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Ohm your injectors after it's hot. I bet the resistance is too high or low and the injector drivers in the PCM aren't sending signal. Same thing happened on my 89.
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Old May 2, 2012 | 08:47 PM
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Originally Posted by 93Rubie
Your post is kinda confusing. Is the battery going dead? Or is the car just refusing to crank over? Or is it cranking but not starting?
You use the terminology loosely and (for me at least) this makes your description confusing.

Whom ever told you to bypass the clutch switch.......RUN, they should not be anywhere near your car. That is a safety item. Only an idiot would by pass that switch. I cannot think of any legitimate reason to bypass a clutch switch.
A lot of track-only cars have eliminated this to simplify wiring.
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Old May 3, 2012 | 08:14 AM
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Default Car won't start when warm

The engine doesn't crank or turn over. Had battery tested showed low reading, so had the battery changed. Problem still persisted. If car sits for about an hour it will start. I was informed by individuals that had this problem with their ZR-1's that once they bypassed the Clutch Switch, the problem went away. Thank You

Last edited by Crusin; May 3, 2012 at 08:20 AM.
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Old May 3, 2012 | 09:29 AM
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Starter could be junk. If it is heat related and wont even crank the starter is the first place I would look. Can you hear the solenoid click when you try to start it? If it is clicking, then that means your safety switches are working, and the starter solenoid is getting the signal, but the brushes on the starter are junk so the gear wont rotate. If the solenoid doesn't click, then you will have some more work to do as it could be a safety switch or the solenoid.

What is the voltage on your battery? If your battery keeps getting drained then you could have a bad alternator or some sort of parasitic drain, but I wouldnt think that is the problem if you can start it again no problem once everything cools down.
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Old May 3, 2012 | 04:03 PM
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Default Car won't start once it is warm

Due to the starter being in a very hot place, I also thought the Solenoid could be the problem and had starter taken out and reconditioned. I had the battery tested and it tested low, so I had it replaced with a new one. Problem still persisted after doing all this. I was informed by individuals who have ZR-'s and have had the same problem, that they bypassed the Clutch Switch and problem went away. I am aware that this is a safety issue, so consequently not sure if I want to do that. Thanks for your suggestions.
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Old May 3, 2012 | 04:27 PM
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Could just be a bad clutch switch, maybe you can just replace it instead of bypassing it?
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Old May 3, 2012 | 04:41 PM
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I concur with your suggestion with replacing the Clutch Switch instead of bypassing the old one. Would be safer with the switch. I will check a few Corvette Suppliers to see if I can obtain one. Thank you for your suggestion. CHEERS!
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Old May 3, 2012 | 07:58 PM
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Originally Posted by Crusin
I concur with your suggestion with replacing the Clutch Switch instead of bypassing the old one. Would be safer with the switch. I will check a few Corvette Suppliers to see if I can obtain one. Thank you for your suggestion. CHEERS!
I'd just jump the switch before replacing it.

I remember having a similar no start condition while hot many years ago on another car. It turned out the starter was heat soaked.
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Old May 3, 2012 | 11:02 PM
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Originally Posted by Black89Z51
A lot of track-only cars have eliminated this to simplify wiring.
Key words here.

A FSM and the wiring diagrams in them would be a big help to you.
You could bypass the switch as a test but not drive the car until you get a new one.
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Old May 4, 2012 | 12:08 PM
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I tried to obtain a Clutch Safety Switch at various Corvette Suppliers but none had the switch available.
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