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Old 04-27-2007, 03:57 PM   #10 (permalink)
Blue94VR4
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Join Date: Mar 2001
Location: Pittsburgh, PA
Drives: 94 VR4
Trader Rating: (19)
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Default Re: Hard start when hot

Quote:
Originally Posted by Davey07 View Post
After i drive my car for awhile, and shut it off, and then try starting it back up in five mins, it hardly starts... I have to pump the gas, and when it finally starts I have to rev it up for about a min or two then its fine. It also starts perfectly fine when its cold... wondering if anybody has had the same problem.. thanks David
This is quite common and in most cases caused by fuel control solenoid on the firewall. When engine is hot solenoid applies atmosphere pressure (instead of vacuum) to the pressure regulator. The idea is to make car run richer first couple of minutes. To test this theory in your case connect fuel pressure regulator to plenum directly and see if it help. It's a part of vacuum reduction mod.

Good luck
__________________
94 3000GT VR4 (upgraded)
"Your 1994 Mitsubishi 3000GT VR-4 is one of 1650. There are 57 other cars that were made with both the same interior and exterior color. Exactly Identical - 8"

For sale:
1. used stock oil sender & gauges
2. used A/C belt (10K on the belt)
3. Stock front and rear sway bars.
4. 3SX dual O2 simulator
5. Used 2'' couplers/reducers/hump hoses
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