Rough idle smoking after running a while

Asked by Feb 21, 2016 at 05:26 AM about the 2002 Jeep Grand Cherokee Overland 4WD

Question type: Maintenance & Repair

cranked up it runs fine but after running for 30
minutes it will have a rough idle and smoke

5 Answers

79,115

Sounds like it may need a tune-up, a going over, throttle body cleaning, checked for codes. The 02 sensor could be a cause.

2 of 2 people found this helpful.
Best Answer Mark helpful
118,935

What color smoke? Black is unburnt fuel, blue is oil and white is engine coolant(water).

Blue smoke

96,265

Blue smoke is burning oil which probably means a worn engine. Try cleaning or replacing the PCV.

96,265

The rough idle may be from oil fouled spark plugs. Try installing hotter spark plugs if this is the case.

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