Idling problem

Asked by GuruXYBX9 Nov 15, 2018 at 06:31 PM about the 2004 Jeep Grand Cherokee Laredo 4WD

Question type: General

My 2004 Jeep Cherokee Laredo
idles at 1300 to 1500 RPMs when
in park why is that

1 Answer


Normal idle speed is about 650 rpms, and when you click on the A/C it may rise to 750 rpms. You may have a large vacuum leak. Check the vacuum line that runs from the cruise control over to the intake manifold. Or any other missing vacuum lines or open vacuum ports. Check for "hissing", ruptured brake diaphragm, leaking air. Look for sticking throttle cable, throttle body. Then scan for codes....turn the key from Off to On three times quickly without starting the motor. Stop at "On" and fault codes will display at the odometer display. It will show "done" when done. Google the codes and fix accordingly. Yes, 1500 rpms is fast. Makes my Jeep go 55mph in top gear/overdrive.

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