Monty Posted February 5, 2021 Share Posted February 5, 2021 Hello everyone. I drive a 1990 Comanche 4.0, the engine seems incredibly healthy, and most of the time has plenty of power. But after driving for a bit if I idle for too long (for example go through a drive through), the idle seems to slowly lower until it is at the point of completely killing itself. Usually after this I will give it some gas and drive, next time I am at a stop light it will be gone essentially fixing itself; however, with the most recent incidence I heard my Comanche back fire, but it sounded like it was coming from right below the engine. Which makes me think I have a exhaust leak somewhere in the header...? Could that cause an issue like this? It's possible that it was an illusion... but I figured I would check with the gurus and see if this has happened before. When I get home today I am going to inspect my exhaust tubing and look for holes/cracks. I figured I would also go ahead and clean my MAP, and replace the IAC as preventative maintenance. But it seems to be an exhaust issue seeing as I heard sometime of backfire. But I also feel it is very strange that it only happened like twice then went away... Any help/tips/ideas would be appreciated, and please feel free to ask for more info! Link to comment Share on other sites More sharing options...
Pete M Posted February 7, 2021 Share Posted February 7, 2021 you're looking to do all the things I would suggest. did you find anything? Link to comment Share on other sites More sharing options...
Monty Posted February 8, 2021 Author Share Posted February 8, 2021 I have been swamped with schoolwork this week unfortunately -.- I am going to take a closer look this weekend hopefully! I will go ahead and replace the IAC and clean the MAP then as well! I looked at my exhaust manifold and it all looked pretty fine, rusty as expected, but no major holes! Recently this week it has seemed to run perfectly fine.... which seems to be the trend with this Jeep haha. Link to comment Share on other sites More sharing options...
Pete M Posted February 10, 2021 Share Posted February 10, 2021 keep us posted! Link to comment Share on other sites More sharing options...
Monty Posted February 12, 2021 Author Share Posted February 12, 2021 So! I installed the IAC, and a brand new MAP, and reset the ECM. The problem has seemingly vanished however, shortly after, I noticed that I was losing quite a bit of coolant -.- I have been searching for the source for the last few days and it's driving me crazy... But at least the other issue is fixed! Link to comment Share on other sites More sharing options...
Pete M Posted February 12, 2021 Share Posted February 12, 2021 one gremlin has been slayed! on to the next! Link to comment Share on other sites More sharing options...
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