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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Hello I'm having an issue where Im driving and I let off gas my rpms get lower then normal then go back up to normal idle rpm. When it is in park and idleing at what is shown in the second picture I gave it some gas and let off the rpms dropped to about what is shown in first picture and then after about 15 or 30 seconds it goes back too the rpms shown in image 2. When driving it drives fine and sounds fine it just a little worrying when it gets that low in rpm for a second. Any thoughts. I just tried changing the TPS and that didn't do much for it
Last edited by ajfran3; 07-25-2024 at 03:46 PM.
Reason: New information about whats going on
A leak in the "brake booster" and or lines associated with it.
I just made an edit the brakes are operating fine and it doesn't matter if I push breaks. It happens as soon as I let off the gas. I tried revved it in park and let off gas and it went down to below normal idle and then went back up to normal idle after about 15 to 30 seconds
Alright so after doing some more testing with AC on and ac off the rpm droppage only happens when the AC is on. Standing watching the compressor when I move the throttle to give it some gas and let go the rpms drop and the AC clutch stops every time. If I do it with AC off the rpms drop back to normal Everytime. Does that mean the compressor is bad, I just got this compressor as a warranty replacement from rock auto because the last one was leaking. I installed myself and had it recharged and it was fine yesterday I made sure to spin the clutch around about 15 rotations like it said to oil the seals and it was spinning fine. I didnt have this problem but today I am. The compressor is a uac compressor
I wonder if the clutch being engaged is adding friction that it shouldn't be, making it a little more difficult for the motor to turn. With the motor off, take the belt off and actuate the AC clutch manually with a 12volt source and try to turn the pulley then...??? I dont know how much resistance there should be, but if its really hard to turn, then that MIGHT be an issue. It might be impossible to turn if you try this with a fully recharged AC due to the system pressure. Maybe you can turn it with a wrench.
Maybe something inside the compressor isnt right.
These are just ideas I pulled from my.... brain. I havent dealt with this issue before...
07-25-2024, 09:26 AM
Rpm dropping whenever I let off gas
