Engine RPMs drop when AC is on
04-14-2022, 07:53 AM
#1
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Year: 1996
Model: Cherokee
Engine: I6 Cyl / 4L
Engine RPMs drop when AC is on
The Jeep idles fine when parked with the AC on. However, if I give it gas and then let go of the gas pedal, the RPMs drop to around 500 and the engine stumbles for a second and then recovers back to normal idling at 750-800. This only happens when the compressor is on. And it only happens when the engine goes back down to idling after opening the throttle.
Last spring I changed the TPS for a dealer bought TPS (fixed shifting issues). This past January I took off the throttle body, cleaned it and installed a new IAC valve to fix my stalling/low idle issues. I also changed the MAP sensor while I was at it.
Is the compressor putting too much drag on the belt? Could it be an electrical issue?
Thanks for reading and commenting.
Last spring I changed the TPS for a dealer bought TPS (fixed shifting issues). This past January I took off the throttle body, cleaned it and installed a new IAC valve to fix my stalling/low idle issues. I also changed the MAP sensor while I was at it.
Is the compressor putting too much drag on the belt? Could it be an electrical issue?
Thanks for reading and commenting.
04-18-2022, 06:46 AM
#2
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Year: 1996
Model: Cherokee
Engine: I6 Cyl / 4L
I think the issue was a loose negative battery cable end. I took off all the old caps from the battery cables, cleaned the cable ends, put on new cable ends and the issue is gone now. The sluggish starting is gone too.
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cruiser54 (04-18-2022)
04-18-2022, 07:08 AM
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Nothing like good old maintenance!!! Thanks for reporting back.
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OldTires (04-18-2022)
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