Hot Starter Malfunction Solved!

My car has been starting fine hot and cold. Now comes June and when that car is hot there is a 2 second delay when I turn the key and when the starter engages. A couple of weeks ago after a one hour drive I left the car in the driveway for 10 minutes and when I wanted to put it away the starter wouldn't engage. I determined that heat has to be the reason for this problem. When electrical equipment heats it increases resistance and results in a voltage drop. I noted the starter didn't have any heat shielding. I went to the local speed shop and bought a starter heat shield wrap. So far its working. Starter is engaging when the car is hot. Tools required - None. Time to install - One minute. Cost - $29.95.
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I installed this starter four years ago, its fine. The problem is heat soak. The starter is inches from the headers. The heat is causing a voltage drop. Some owners are installing relays to increase the voltage and overcome the increased resistance. I thought of another car I owned that a new starter failed. Upon inspection I found that the tech had not replaced the starter heat shield. So you can reduce the heat or increase the voltage. I went with the heat reduction.

 

Headers are still insulated. I suspect that 30 years and 69,000 miles has caused some deterioration. In addition I think the insolation on the wiring harness is also less effective so I'm going to add a wrap to it. I may end up adding relay. We haven't got to the hottest days yet and this might not work in August. A friend was very upset this weekend because is new $2,200 starter in his Countach did not fix his hot starter malfunction. I too replaced my starter for no improvement. I'm trying to save you guys time and money. Do the simple and cheap stuff first.

 

I did.