Mosquito fogger that is my jeep

Asked by Mar 30, 2016 at 11:13 PM about the 1996 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have a 96 4.0 grand cherokee. It's been sitting for
about a year, and i was told that the check light
came on followed by smoke and it was immediately
parked after. It had a rough idle as well. Long story
short, pcv was replaced and suddenly the check
light is off and says "PASS" on the OBDII. But it still
has a rough idle and runs like crap and smokes
when throttle is applied. Could that be from the
gunk that was sucked into the intake from the pcv
being stuck open?

4 Answers

5,575

sounds like it just needs some fresh fuel - especially if its been sitting for awhile. the check engine light is triggered immediately when there is a hard failure like you experienced, but something like a random misfire or harder to detect problem may take a full drive cycle to trigger the light

86,925

Is it white or blue smoke? White would indicate blown head gasket or a cracked head this the poor running, blue could be valves seals, piston rings, worn cylinder walls, etc. HTH

1 out of 1 people think this is helpful.

It's bluish. Like i said some of the oil was sucked up into the intake and idk if it's just burning off excess or what.

86,925

If it is just burn off then it should stop smoking with in a few miles, if you let it idle it may not have enough heat in the catalyst to fully burn the residue and will build up in the catalyst, so if you can't drive then run the engine rpm's up and down within reason until it burns off, or if it burns off. Then I would run a compression test just to make sure it is a weak or dead cylinder causing the bad running.

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