My D16Z6 motor in my 92 civic won't start when it's hot outside. The motor is cold when I do this. I remember reading about perhaps replacing a switch but cannot remember what exactly was mentioned, other than it was under the dash. Any help would be greatly appreciated.

 

try the main relay its under the dash i believe above the hood lever held on by a 10 mm bolt if you pop it out of the casing look at the soldier see if there are any cracks or if it smells burned. also when you turn the key it should click a few times the stock ones are usualy have a grey cover and its like a redish relay in them hope it helps

 

Main relay is always suspect with the only acts up when it's hot outside thing. I'd look there first.