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I have a 1966 GTO , I have hot start problems , cold she fires right up !
Iv Changed the starter put in a mini high torque , Changed the starter wires put in bigger gauge wires , I have 21/2 exhaust from the manifolds out , still Fires right up cold even sitting for months , when running at operating temperature , which is 190 after I converted the stock radiator from 3 cores 9 fins per inch to a 4 core 14 fins per inch ,
Ill shut it off and I have nothing not even a click , Its very frustrating , any advice we would so appreciated !
posted: August 14, 2011
  Answers (6)
try jumping at the starter if it works there you have wire broke inside insulation .the insulation expands just enough to break contact when hot and contracts when cooling down.
posted:  August 15, 2011
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Have you tried bypassing the ignition circuit with a push button that hooks directly on the starter. This would eliminate ignition and neutral safety switch issues. Does it have a heat shield? Are all the ground wires clean? When turning the key in the start position hold it there for a lil bit, any loose connections should warm up like an oven element. The trick is to get connection warm without melting wires....or burning fingers
posted:  August 15, 2011
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posted:  August 17, 2011
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Hi 1966gto

I agree with dana5cars.

Timing may be too far advanced. ( Does it sparknock ? ) , If so, too far advanced. Before changing timing, check your main electrical connection plug at firewall to make sure you have full 12 volts from battery and through fuse block.. Sometimes these tend to fry up in there and don't give you proper juice back to the starter. I had the same problem with one of my vehicles , and cut the wire and resoldered , and problem cured.

Take care

posted:  October 27, 2011
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Could be that you need to put a shim or two between the starter and the mounting bracket for the starter. When the car heats up it can change the angle of the starter sproket and can put alot of touque on the starter. Had this with my 69 after i put headers on it. Also see if your timing is set to far in advance. This will cause the same issue after it gets hot. Check the groud going to the exhaust manifold from the battery. That should not have paint on it where it meets the head.
posted:  December 15, 2011
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Check out the forums section of your local GTO website or GTOAA.
posted:  August 13, 2013
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