Misfire in all cylinders- then goes away - JeepForum.com
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post #1 of 7 Old 06-03-2019, 09:38 AM Thread Starter
broncoguy80125
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Misfire in all cylinders- then goes away

So I'm driving home the other day, and all the sudden the Jeep starts cutting out and turning back on. Then starts bucking and shaking, but will smooth out again. Got it home, checked the codes, and it was all P0300's- all cylinders. Let it sit overnight, cleared codes, and drove it around for about 30 min- no more codes and no driveability issues.

Any thoughts on this? I know a lot of things can cause the misfires, but I didn't get any specific codes for like cam position or crank sensors- had the crank sensor replaced about 6 months ago. Maybe fuel related?

Seems odd to me that one minute all hell is breaking loose and the next day it all seems fine...

Thanks!

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post #2 of 7 Old 06-03-2019, 10:15 AM
DJCantonGA
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Not sure, but I had a similar issue last year. Was riding forest service roads in the middle of nowhere north GA. Stopped to take some pics, maybe 15 minutes. Started it back up, and it idled rough and sputtered. CEL came on, and I scanned it and got 2 misfires (301 and 303 iirc). Got back to the main road, and it was fine, and has been since. Not sure what caused it. Heat soak?
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post #3 of 7 Old 06-03-2019, 01:19 PM Thread Starter
broncoguy80125
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Yeah, I read about heat soak as well, but it wasn't that hot out, and it's never happened before- but maybe that doesn't matter.
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post #4 of 7 Old 06-03-2019, 02:32 PM
DJCantonGA
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Mine didn't do it again, which is good, but I wish I knew what caused it. Nothing like it happening when you're in the middle of nowhere with no cell svc! Oh well, I need to walk...
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post #5 of 7 Old 06-03-2019, 03:18 PM
LuthWJ77
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Heat soak shouldn't be a factor when the engine is already on it happens on a hot re-start. I live in Houston mine would stumble for a few seconds in Summer after a quick stop and go so I bought an insulation kit I found on Amazon. New insulation to cover exhaust manifold (similar to oe but not crumbling) and also blankets for the rail and each injector. No issues since I put that on. I don't think this helps broncoguy unfortunately I'd be checking battery cables and grounds make sure all of that is good.
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post #6 of 7 Old 06-03-2019, 04:52 PM
DJCantonGA
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Quote:
Originally Posted by LuthWJ77 View Post
Heat soak shouldn't be a factor when the engine is already on it happens on a hot re-start. I live in Houston mine would stumble for a few seconds in Summer after a quick stop and go so I bought an insulation kit I found on Amazon. New insulation to cover exhaust manifold (similar to oe but not crumbling) and also blankets for the rail and each injector. No issues since I put that on. I don't think this helps broncoguy unfortunately I'd be checking battery cables and grounds make sure all of that is good.
That is what I did with mine (before the incident mentioned above). The oem insulation fell apart. It was stumbling upon restart and getting worse. I ordered the new insulation piece and that fixed the issue.

I love my WJ, but sometimes the little problems can drive you crazy.
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post #7 of 7 Old 06-03-2019, 05:11 PM
jtec
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hope for the best - BUT if it happens again do not clear codes, with your scanner record ALL codes for us to look at and access and post freeze frame DATA.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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