trouble cranking when engine gets hot

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If your starter is turning over really slow, like a re-start after the car sits a bit and everything is heat soaked, I would suspect a bad ground or grounds. I had this problem when I first bought my car (many years ago). The wires would actually get hot and smoke even with a brand new battery. What finally cured it was taking off the ground strap that goes to the engine and vigorously cleaning everything until all the metals were nice and shinny. That lasted for many years and then I think I had to do it again maybe once... Good luck !
 
Nope, no codes.

This is definitely related to some component i.e. starter (I've also heard starter solenoid?) or wire/wiring getting hot and therefore causing the car to have trouble cranking.

I have an OEM type larger starter. Would the hi torque mini starters be any better? My guess making a heat shield would still be required. Is that thermal shield tape a good for making a shield?
 
Had the same issue. Ended up being my ECT was bad

I had to step on the gas for it to start up when the car was hot

Any codes pop up for your car?

The ECT should not affect the cranking ability of the starting system. It would only affect the ability of the engine to catch.
 
Had the same problem

It was the starter...should get something with higher cranking ability.

EX: WPS-3205 High Torque Mini Starter - Long Nose
1965-67 All & 68-73 Auto Trans 289/302/351
1967-70 390, 427, 428
1975-95 5.0 All

Havent had one problem yet (5 years later)