Why will my car not start in very hot weather?

MOONVIPER2002

MEMBER
1992 MITSUBISHI 3000GT
190,000 MILES

Car runs great, however recently when it has been very hot outside, the car won't start, it will start as a low idle then eventually get only the click as it tries. I have replaced all the fuses, the fuel relay and it still happens. I'm not sure what to check, it seems to only happen when it is very hot inside the car.

Sunday, July 29th, 2012 AT 3:01 AM

4 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Have the battery load tested first.

Check the fuel pressure as well.

Roy

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Sunday, July 29th, 2012 AT 3:18 AM

KHLOW2008

MECHANIC
41,814 POSTS

For the low idling, check the ISC and throttle body. Clean them and retest.

For the clicking, apart from the battery conditions, check the wiring connections and condition.

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Sunday, July 29th, 2012 AT 9:49 AM

MOONVIPER2002

MEMBER
2 POSTS

Battery is good, the clicking is from the starter, it will almost start, low idle then die, then turn over and die, then attempt to turn over, then if I keep attempting you'll only hear the starter. It seems like its getting zero fuel, and it only does it when its been sitting in the sun or in very hot weather, I can run the car for 200+ miles and be fine as long as it stays cool inside the car, but as soon as the inside gets hot as hell, thats when the problems start happening. Fuel pressure is good as well. If it is the throttle body wouldnt it be a constant problem?

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+1

Tuesday, July 31st, 2012 AT 3:02 PM

KHLOW2008

MECHANIC
41,814 POSTS

Does applying some throttle pressure gets the engine started?

The throttle body and ISC would act up when operating temperature increases. They can cause excessive low idling and would start and stall unless accelerator pressure is applied.

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Tuesday, July 31st, 2012 AT 3:23 PM