Rough idle smoking after running a while

Asked by Icelamder 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

6 Answers
225,385

Rowefast answered 9 years ago

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

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201,495

dandyoun answered 9 years ago

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

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F_O_R answered 7 years ago

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

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F_O_R answered 7 years ago

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

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10

Guru94WH8H answered 4 years ago

White smoke coming from the front of the car was checked 5 times and it's still has smoke coming out after driving for 30 minutes

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