2005 Grand Cherokee Cylinder 1 misfire 4.7 - Jeep Garage - Jeep Forum

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Old 08-29-2012, 04:41 PM
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Angry 2005 Grand Cherokee Cylinder 1 misfire 4.7

I have an 05 GC with a 4.7, 105k miles. Plugs were replaced within the last month when doing the 100k mile service. And I should mention that the vehicle had a Cylinder 1 misfire and Multiple Cylinder Misfire code before the 100k service was preformed(P0301 & P0300)
About a week after it got out of the shop, P0301 came back, after doing and OHM test on the coils and injectors, I found that Coil 1 had a higher ohm reading then the rest of it, so i replaced it.
A couple days later, the P0301 came back, and I switched the coil and plug from cylinder 1 with the coil and plug from cylinder 3, and injector from cylinder 1 with the injector from cylinder 5(to pinpoint if its the injector or coil/plug causing the problem)
Two days later, the code came back.

The engine ONLY misfires when its cool, in the first 10 seconds of starting, after a few seconds, it runs smooth without the misfire. No misfires going down the road at all. And it only does it like 2 or 3 times a week.

anybody have any ideas what the problem might be?

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Old 08-29-2012, 05:51 PM
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Your probably looking at a carbon issue on your valves, I would suggest you try like seafoam our mopar combustion chamber cleaner.

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Old 08-30-2012, 12:18 PM
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Re: 2005 Grand Cherokee Cylinder 1 misfire 4.7

its already been seafoamed, didn't make a difference.
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