Tachometer showing high idle in park and low RPM while driving
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Model: Cherokee
Tachometer showing high idle in park and low RPM while driving
When i first start it up (then goes into idle) the gauge reads 1,000 RPM (the motor doesn't sounds like it's revving up). Then when i put it in drive, the tachometers needle only ranges from 1,000 - 2,000 RPM. Every once in a while the gauge will work correctly. When it does, it drives a bit better, and I feel less resistance in the gas peddle. I searched up some things and kept getting the same results, "TPS", "EGR", and "CPS". I just replaced the TPS sensor today (5-2-12) and no change. I have a video of the motor revving up in park from earlier today, to give you more of an idea of whats going on.
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Location: North Dakota
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Year: 1999
Model: Cherokee
Engine: 4.0L I6 Power Tech
My 99 is acting somewhat similar, though not revving as sharply as yours. It jumps from an idle of about 850-900rpm to 1200-1500rpm, will stay there for a little while (5-20 seconds), then drop back to idle. It also surges while driving and has intermittent no crank issues, so i'll be replacing my CPS tomorrow to see what happens.
Of course I have other issues that point to the CPS, but your issue is one of my symptoms, so there's my recommended starting point for ya!
Of course I have other issues that point to the CPS, but your issue is one of my symptoms, so there's my recommended starting point for ya!
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