Hi guys! I am currently on a road trip during this massive heatwave in Cali. Last week I cleaned my TB and IAC with intake cleaner. No issues with it. Left my home yesterday in Grass Valley CA to take 395 down to Lone Pine. When I hit Tahoe my CEL came on. Didn't effect anything, still ran fine. Stopped in Carson city to read the code. It was p0107. Cleared it and went on my way to see if it came back. After 100 miles and some massive passes to climb through it did. So, not sure if this is due to the massive altitude changes? Or my cleaning. My jeep generally lives at 2k feet but some of those passes were 8k plus feet. T did have a hard time getting up some of those passes. And fool drivers made it difficult to maintain speeds.. Any advice before I go changing it? No loose connection or hoses visible. But I gotta drive this girl home in a 110 degree heat!
P.S. my throttle body and IAC were very dirty before I cleaned them!

 

P0107 = MAP sensor. Double check the vacuum line between the throttle body and the MAP sensor isn't cracked or loose. Check the wiring to it as well.

 

I'll go through it and check it again. I may have knocked something in there when putting things back together.

 

[QUOTE=jpluvr4life;3618989]I'll go through it and check it again. I may have knocked something in there when putting things back
All looked good. The second code it threw was actually.for low fuel pressure/ fuel pump. I've got a Bosch in there that is about 5 years old. It shouldn't be going bad. I think the altitude changes and the severe heat are messing with things. It's my daily driver back at home and it never gives me issues like this. But taking it to the high dessert during a heat wave may just be too much for the old girl.

 

Hi guys! I am back home and can finally make a proper post here. Soooo, last week in preparation of a road trip to the Alabama hills I decided to clean my throttle body. It was filthy and so I also decided to pull the IAC and clean that as well. It's my daily driver so I was driving it around for about a week before the trip. NO issues. I live up in northern Cali, decided to take 395 down to the Alabama hills ( mt. Whitney). If any of you are familiar with that hwy you go through quite a few passes 2 of which reach 8100 feet in elevation ( I think this is important information) and a few more that are 7k. Last weekend was a massive heat wave here too! 110 degrees in some places along that route. Anyways, when I got close to Carson City NV my CEL came on, stopped and had it read. It was P0107( MAP Sensor), no noticeable running issues or decreased gas mileage so I went ahead and cleared it and went on my merry way. The CEL came back on after about 100 miles. Still no running issues. Made it my destination running the a/c in 110 degree heat no problem. Re read the code and to my surprise it was now P0171 (low fuel pressure/running lean). Cleared it, drove another few hundred miles. Back through those same passes on my way home. Got to Tahoe and it came on again after pulling one of the long slow grades. Same P0171 this time. So, my question is are these codes coming up from the massive altitude changes? From me cleaning things and maybe my IAC got a little damaged? It is not showing me any symptoms. My gas mileage is normal. Not misfiring or idling rough. I drove it to work today no problem.
P.S. My fuel pump is maybe 5 years old. I replaced it with a BOSCH.

 

I have a similar issue when I spend extended periods wheeling at high altitude, then the CEL comes on when I descend, but will go off on it's own after a couple of driving cycles below altitude. Haven't researched it but someone at a NAPA told me that the MAP sensor on the Cherokee gets all wonky above 10k feet and actually several other vehicle models. This was in a mountain town and I guess they get a lot of people coming in to get replacement MAP sensors when this happens and it really isn't a problem. Like I said, sounds weird to me and haven't actually researched it myself, but if since you mentioned it occurred at altitude, thought I would throw that out there.

 

very interesing, I think its an altitude thing too. Most of that travel was through massive amounts of fire smoke and im sure ash too. California is 🔥🔥🌋Never really considered my MAP sensor reading altitude and making adjustments. I'm back to my daily driving in it with no issues. It always runs great so I found this odd. It never affected the gas mileage or anything. Started right up any time I stopped and never ran rough. I would be interested in hearing if others have also experienced this.

 

You have to be very careful when cleaning the TB. TPS sensors don't like it at all when you blast the cleaner around in there. More than one have had this happen, myself included.

 

The best way to clean a throttle body is to remove it from the vehicle and remove all the sensors before you start cleaning. This way the TPS and MAP never see harsh cleaners that could damage them. You can carefully use throttle body cleaner on the IAC, but don't use brake cleaner on it. The body itself has o-ring seals in the throttle valve shaft that need care as well. You can use brake cleaner on it if you are going to replace those seals, which is a good idea anyway.

I mentioned the MAP sensor because the one on my 00 is mounted directly on the throttle body whereas some older ones have a hose to a remotely mounted MAP.