rough idle/stalling in hi temps

[slowstang88]

Well it's above 100* in Vegas, and when I exit off the hiway and stop at a light my idle gets really choppy and sometimes stalls, has anyone had issues with vapor lock in the fuel rail? BTW, it's a 1999 mountaineer 5.0. Fuel pressure is good, no CEL, just cleaned the MAF, and 1/2 tank of gas.. I just helped a friend wrap his fuel rail on a 4.0 Cherokee and that fixed him up. I also load tested the battery and tested the alternator, both passed fine.

 

[intelisevil]

Ignoring the temperature, the choppy idle and stalling when you come to a stop sounds like the problem I had with my '00 4.0 SOHC. After doing some searching on here I cleaned my IAC valve and no problems since.

This link shows a 4.0 OHV engine but it will give you a place to start.

http://www.explorerforum.com/forums/showthread.php?t=84220

Good Luck,
Dan

 

[slowstang88]

Thank you for the link, I will check it again even tho I just did. Trust me, I'm willing to try damn near anything at this point to clear it up. This problem is driving me insane...

 

[slowstang88]

Definitely not the IAC, it's still clean and operating fine. It did it again today in the same spot after exiting the hiway..