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Old 11-24-2008, 03:19 PM
Y OWN 4 N #2
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Default High and Low Idel
90 Jeep Cherokee Limited 4X4, it idels fine for a muinte then it goes to 1200 to 1500 RPM and it may stay there after warm up or come back down. I've done replace the stepper motor, Air sensor, MAP sensor, and unplug the coolent sensor and none of this has helped. My next step is the ECU.

Does any body have an idea what it may be???
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Old 11-25-2008, 07:48 AM
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Did you clean the throttle body? Is the O2 sensor still OK?

Could be the ECU, but mostly it a bad connector or groundstrap. Check them also. Also check if the TPS is adjusted well, just to rule it out.

It could also be false air. Spray some WD40 on and around the TB when the rpm rises.
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Cherokee Pioneer '88 i6 2-door 5 speed mostly stock
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Old 11-28-2008, 04:33 PM
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Loose manifold? Bad brake booster?
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