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

2 Answers

50,975

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

Best Answer
105,965

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

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