Odd problem: after driving for, say, 10-20 miles, and during that time, stopping at few places, turning off the engine, starting and driving again for a few times, comes a point when engine does not crank, but after 10-15 minutes of engine cooling off, cranks very strong and starts immediately and strong like there were no problems. The issue and the symptom is ALWAYS the same. Also, before the no crank situation occurs, that is during the last crank before it does not, it almost always hesitates at crank for a second but cranks: It goes "nn nn vrooom (starts)" within a span of a second Next one ends up with no crank which points out to the problem definitely related to hot engine's heat effect at one of those related components, I think.

I know that, technically speaking it resides at one of these: ignition switch, starter solenoid, starter enable relay, automatic transmission switch, pass key module. I hope that the (hot engine/no crank--> cooling for 15-20 min/ perfect crank and start) symptom can point out to the exact component without going through the diagnostic process of checking each one.

Can anyone point out to the faulty component with a fair amount of certainty please? Thank you in advance for your attention and time

 

If you're looking for 'certainty' from electrical system troubleshooting on an internet forum, you're barking up the wrong tree.

I'd suspect the starter is wearing out though.

 

starter is brand new but awfully close to double exhaust pipes hence I suspect the heat factor after certain time. I was thinking the same as the most likely component though: perhaps covering it with a heat resistant material around the starter might solve the problem.

 

A new starter is still susceptible to heat-soak. Try fashioning a heat shield from a piece of sheet metal.

 

There is one but apparently insufficient.

 

Check your timing it may be too far advanced

 

6 degrees, rebuilt engine, we have been meticulous about engine details Also, timing would have caused other engine run issues, I believe.

 

I had a new engine do the same thing ran perfectly and started when cool but run it for a while park it then it wouldn't crank until it cooled down. Put 2 new starters and a new battery in it until someone suggested i back off the timing. Backed it off 4 degrees and started everytime. Not saying its the issue but its real easy to rule out.

 

Do you have headers? And what type of starter motor are you using?

 

Intriguing, I'll keep that in mind.

 

Stock. AC DELCO OEM, stock again.

 

How long was "until cooled down" in your experience? Mine is 10-15 min.

 

also are you sure your starter is shimmed correctly and not too tight to the flexplate / flywheel

 

yes. also I think that would create problems even when attempting cold start which doesn't at all.

 

it certainly can. however if it isnt shimmed right without enough gap it can be ok cold and then be a problem hot as the gap gets slightly smaller as everything heats up due to the coef of expansion

 

Yes, I agree, but also think that it will also crank very slowly in that case, grinding: this is dead when hot all of a sudden ,n the "next" start attempt and back like no other after 10 min. of cooling.

 

I had a very similar problem. I did the heat shield, multiple starters etc...then i installed the ford solinoid, I rerouted the stock wiring harness(without modification) to the solenoid then i added a Large cable from solenoid

to starter and jumpered the small "start" terminal to the larger terminal at starter.
Now all is good and no issues at anytime with starting..........

 

Make sense. I'll go with the least expensive approach first and wrap the whole thing with an aliminum heat cover and fix it in its place with plastic cuffs. If the problem is the heat absorption, there is a very good chance it will solve it.