Went wheeling yesterday nothing to bad other then bending stock control arm. Buddy gave me one and we swapped it out. Drove the jeep home with no issues. This morning i drove the jeep and it seems the idle is sticking at high idle around 1200 - 1500rpm. When letting off the gas in gear it doesn't want to drop below 3000rpm on a hill that normally will drop to around 1200rpm. I pulled the TB and cleaned it really well. Replaced the TPS, and cleaned the IAC. Couldn't find any vacuum leaks. Any other ideas i am stumped.
Don't know if it's related, but I've been having some idle issues lately after disengaging 4x or the lockers (not sure which triggers it yet) and for now disco'ing the battery for a couple of minutes resolves the issue. I'm looking into it and it may be related to needing a flash because of a recent OPDA swap, but I'd try disco'ing and go from there.
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A high idle is caused by either a vacuum leak or a dirty IAC (idle air controller). The IAC is what controls the idle and provides all of the engine's air when your foot is off the gas. There are a lot of threads in JF on how to clean your IAC with throttle body cleaner, look for a possible vacuum leak as well.
It still has a plunger that fits into a hole into an oriface in the throttle body, it's just a larger diameter plunger than was on older model IACs. Did you clean the surface inside the oriface that its solenoid actuated plunger fits into?
Took the IAC off again and used some more cleaner on it. Still the same. Sprayed starting fluid around the intake, no change in idle.
It idles just fine, its not rough or anything like that, no delay in coming off idle. Had auto zone try to pull codes from the ECU, came back with nothing. I don't know what else to check, its almost like driving an auto right now, you let off the gas and it doesn't want to slow down like normal. I guess you couldn't say its sticking coming back to idle, but it takes much longer then it should to return to idle when you take your foot off the gas.
Butterfly valve plate returns normally? If that's ok and the IAC is ok, I'd spend some more time looking for a vacuum leak. Maybe a bad TPS but it sounds more like a vacuum leak if the valve plate is closing properly and the TPS is ok.
TPS is the first thing i replaced. Butterfly plate is tight and has lots of spring tension. Maybe air flow sensor not reading right? Not sure where or how to look for a vacuum leak any where. I sprayed some starter fluid around the TB with it running and the idle didnt change at all.
I took off that line you have in the picture, my idle increased, put it back on and my idle went back to normal. So guessing that is not the leak. Engine was to hot to try and move stuff around to spray the intake. Lots of stuff in a small area lol.