misfire in cylinder 4 on a 6 cylinder jeep grand cherokee 2001 HELP! PLEASE!

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Asked by Jul 15, 2013 at 03:06 PM about the 2001 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Ok at a loss here please help. Had check engine light on. Code came up as a misfire in cylinder 4. So replaced all spark plugs ( they had a white powder like substance on heads) and new coil packs (arm) all at right size. Still shakes like crazy when idle. lound running when under 30. RPMs a little out of wack. Mounts are nice and tight ....... anybody know where to go from here ?

1 Answer

22,485

The white substance is most likely a dielectric compound - good stuff. The fire triangle: Fuel, heat and air. Injector, spark plug, wire, cap, compression, lifter, rocker. I'd look at the fuel delivery (injector) - is it getting power and does it work?. I'd also look at compression in this cylinder versus the other cylinders (valve problem). I wouldn't drive it until I got it fixed. Could damage the Cat if it's dumping a lot of unburned fuel.

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