Intermittent engine misfiring

Tiny
ZBACKUS
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 197,000 MILES
So my vehicle listed above started acting up. When I drove to work a few days ago about 30 miles away my car was fine. But on the way back there was this flapping noise at idle and while driving. When I accelerated my car would start to kick and shake, but when I accelerated quickly it didn’t do it. The check engine light was also flashing. When I got home the codes said it was engine misfire in the second and sixth cylinder. I changed the spark plugs and that didn’t fix it. So I changed the ignition coil and I thought it was fixed, drove fine all around town. When I drove to work it was great but when I drove home the problem came back. I shut the car off and turned it back on, it was a very hard start. It was also idling really rough and almost stalled out. I turned the car back on and kept going and the problem went away. I also noticed that when I start my car and I hear the flapping the problem will come back, but I can shut my car off and start it again and the noise usually goes away. Any ideas what it could be? Please help.
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Friday, November 20th, 2020 AT 1:15 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

Can you upload a video of the noise so I can hear it?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Was the 302 and 306 the only codes that was set? I would check the compression in all cylinders to be sure there is not an internal issue.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-engine-compression

Also, check the fuel pressure as low fuel pressure will cause misfire codes from the lack of fuel to the rail.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy

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Friday, November 20th, 2020 AT 4:02 PM

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