Jeep Grand Cherokee misfire p0303

Asked by Fred886 Nov 25, 2020 at 02:06 PM about the 2009 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have a 2009 Jeep Grand Cherokee with a
p0303 code. I tested the compression in the
3rd cylinder and it’s reading zero. What’s my
next step? Could it be a stuck valve?

1 Answer

1,720

Most likely. If it was the oil rings it should still register at least some compression. Unless the cylinder itself is gouged. Regardless you're going to need to pull the head to find exact cause. Backfiring would hint at intake, unburned gas would hint at exhaust

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