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Old 12-21-2011, 11:49 PM
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car wont turn over when it is warm

i love working on my 1968 pontiac with my son : :

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Old 12-22-2011, 01:04 AM
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Given the little info, I suspect a bad crimp on the positive battery cable to the starter.. If the battery cables are NOT original eq, they might be aluminum.

those heat up and spread the crimp even worse..

I gather the battery and starter are ok ?

Leaking valve covers can make bad contact on the contacts in the starter solenoid or on the brushes..

gluck
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Old 12-22-2011, 07:01 AM
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The most common cause is too much initial timing or heat soaking of the starter. A cold engine is easier to turn than a warm one. You can prove if it is timing by disabling the ignition when it is hot and trying to crank it. If it cranks normal it is timing if not it is most likely a bad starter, bad connection or both.
You may also want to have the battery load tested to be sure it is not as simple as a weak battery
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Old 12-22-2011, 09:20 AM
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GM solenoid bypass

There is a lot of info on using a FORD starter relay between the battery and the starter, and reconnecting the GM starter wires to cure hot start GM problems, A starter heat shield also might help.
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Old 12-22-2011, 10:45 AM
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welcome
lots of good people and info
we like pics, they are worth a thousand posts
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Old 12-22-2011, 11:14 AM
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Just speaking from my recent experience this past July. It was the starter. Try a known good battery and you can also bypass the battery cables with a good set of jumpers to veryify that the cables are good. Starter is usually the hardest part to change, so verify everything else is good first.
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Old 12-22-2011, 12:30 PM
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I used to have this problem with my Nova after I put headers on it, then I bought a starter heat shield and it solved my problem. Headers can really accelerate the time before a starter goes bad.
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Old 12-22-2011, 01:38 PM
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Just went through this same problem with my 69 bonneville,, Pontiacs and most GM cars have a hot start problem,, if it starts fine when its cold,, but either slow or refuses to turn over when hot,, its a hot start problem, and once the problem starts its not gonna go away with out some attention,,
My problem started out as just a click from the selonoid when trying to start. I removed the starter and found the selonoid had bad contacts,, took the back plate of the starter motor off,, and all kinds of rusty dust and dirt, fell out,, the brushes were shot, (not surprised after all this is the origional starter)
I went to NAPA and got a origional Delco remanfactured starter and selonoid for 48$ and got a heat shield and everything is good again,,,
(JUST A HEADS UP)-- when you get the new starter check and see if the bottom bolt that holds the starter halves to gether has the stud on the bottom bolt for the bracket from the engine block?? if not use the one from the origional starter,, other wise you will have to take the whole thing back off to change it,,
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Old 12-28-2011, 03:28 PM
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Take the small nut off the solenoid (the wire that activates the solenoid) Tighten the nut,behind that terminal,so as to make good connection to terminal inside the solenoid,reattach wire.
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