when i start my 1999 jeep cherokee sport it idles down low and sometimes quits so i have to hold the gas down for a few seconds and it will idle fine i installed a new idle control valve and still the

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Asked by Nov 11, 2014 at 05:14 AM about the 1999 Jeep Cherokee 4 Dr Sport 4WD

Question type: Maintenance & Repair

2 Answers

86,545

On some of these Jeeps the ECM has to relearn the idle speed after you have replaced an idle component, make sure you throttle body is clean, then disconnect the battery, turn on your headlight switch, wait at least 30 seconds, turn off the switch, reconnect the battery, the ECM has now been reset to factory specs, set park brake and block wheels for safety, foot on brakes, start engine, if an automatic put in drive, if a stick put in neutral, turn on all accessories, ie heater fan headlight radio etc, let engine idle stablise, it can take a minute or two. If an automatic put in park and remove wheel blocks, if a stick make sure park brake is set and remove blocks, then drive as you normally do, this relearning the ECM on your driving style, this usually takes about 20 minutes of driving to complete. It should also pickup on any other faults in your system and turn on the check engine light if any are found. HTH

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thanks Mark

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