hey guys, I came here as a last resort. My 84 z31 turbo 137k will not start back up if it reaches normal operating temp and I shut it off. I changed the crank angle sensor, MAF, and fuel temp sensor, The only other thing that I can think of being broken is the ignition module. I hear that once they get warm inside they don't work until they are cooled down. Also when it starts after cooling down, it misfires until I floor it. Any information is greatly appreciated! PS compression is great,

 

ignition module will fail when it gets marginal due to heat. Get a can of Freeze spray
like this


next time it happens freeze it and see if that fixes things. check for vacuum leaks. what is your fuel pressure. fuel temp sensor was a waste of money as was the maf since it didn't change anything. Diagnose before swapping parts saves a lot of money.

get the fsm from xenon (free). Read it!

O2 sensor and chts are two coponents that are heat sensitive. You can eliminate the O2 sensor by unplugging it and see if the problem goes away. I just change out the chts if I am having issues.

 

Thank you so much, I have a new chts that I will put in just in case. And I will make sure I do the o2 sensors. Just kinda feels like there is no spark when it's hot. Thank you I'll get back to you