1977 Corvette Problem

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Aug 26, 2017 | 02:37 PM

ssparks

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1st Gear

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1977 Corvette Problem

My 1977 Corvette starts and runs great when cold. If I try to restart when it is still warm it has no power. I have replaced the starter, carburetor, steering column and continue to think it is an electrical problem. Any ideas.

Aug 26, 2017 | 03:42 PM

Sabre34

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From: Parrish FL

St. Jude Donor '06 thru '26

Check in with the folks on the C3 forum. A lot of good info there. Welcome aboard!

Last edited by Sabre34; Aug 26, 2017 at 03:43 PM.

Aug 26, 2017 | 03:58 PM

Vetteman Jack

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Moving this to the C3 Tech section.

Aug 26, 2017 | 05:11 PM

REELAV8R

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From: Hermosa

I had my neutral safety switch go out intermittently and i had the same symptoms. For whatever reason it was fine cold but once warmed up it failed, not every time but most times.
You could try moving the shifter in and out of "P" (assuming an automatic) then retry starting to see if it has any effect.

Aug 26, 2017 | 06:39 PM

sparky77

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From: Il.

Could be a bad coil, when they get hot they will short out and lose power or not work at all.

Last edited by sparky77; Aug 26, 2017 at 06:40 PM.

Aug 26, 2017 | 06:50 PM

sullyman56

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From: Scottsdale Arizona

On my 77 that had similar symptoms I replaced the ignition module and that took care of it.

Aug 26, 2017 | 08:23 PM

'75

Le Mans Master

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From: McHenry Illinois

Does your engine crank but not start, or not crank, like the starter won't turn it?

Aug 26, 2017 | 08:46 PM

HeadsU.P.

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From: Cool Northern Michigan

I think Sullyman nailed it. The extra heat under the hood of C3s causes the "Modge" to expand. That breaks the circuitry, no spark until cool-down. Pretty easy to replace. Buy a new one, keep the old one in a rear compartment with the tools to replace it for emergency use.