Cylinder number two misfiring?

Tiny
RICHARDM021
  • MEMBER
  • 2011 JEEP COMPASS
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Starts fine. Start driving and it will start to skip. Shut it off and restart it and it runs fine. Start driving and will start skipping, repeat, repeat. It skips on the #2 cylinder only. Changed spark plug and coil pack. Did not fix the problem. I have also replaced the 2 cam sensors and crank sensor.
Saturday, July 16th, 2022 AT 9:47 AM

17 Replies

Tiny
KEN L
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  • 50,397 POSTS
If the compression is good the most common thing that goes bad is the fuel injector. here is a guide to help you make sure the compression is good and how to change out the fuel injector in the diagrams below:

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

Here is a generic guide that can help you see what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

Check out the diagrams (below). Please let us know what happens.
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Saturday, July 16th, 2022 AT 6:58 PM
Tiny
RICHARDM021
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Thanks. I will give this a try as soon as I receive the injector. I will let you know the outcome. Once again thanks
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Sunday, July 17th, 2022 AT 6:03 AM
Tiny
KEN L
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Please let us know what you find. We are interested to see what it is.
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Sunday, July 17th, 2022 AT 11:44 AM
Tiny
RICHARDM021
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  • 10 POSTS
Sorry it took so long to get back to you. I did the injector. Still doing the same thing? It runs well after you start it. Bring it to 2,000 + RPMs will start to skip. Only on the #2 cylinder. Turn it off and restart it and runs fine until you bring up the RPMs then it starts skipping again. #2 cylinder only? I don't know where to go from here.
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Sunday, July 31st, 2022 AT 11:06 AM
Tiny
KEN L
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Okay, we need to remove the valve cover and use a flashlight to check for a broken valve spring on cylinder #2. Here is how you can remove the valve cover in the diagrams below. I would remove the spark plug to make sure it is not cranked as well. Let me know. Check out the diagrams (below). Please let us know what you find.
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Sunday, July 31st, 2022 AT 1:38 PM
Tiny
RICHARDM021
  • MEMBER
  • 10 POSTS
Well, I removed the valve cover. All seems to be ok. I rotated the engine so there was no pressure on the valve springs on #2 cylinder everything looked fine. I check the intake and exhaust springs. I tried moving the springs with a screwdriver. Everything seems tight. I would think it would move if it had broken. The spark plug was black because of the miss fire. Any more ideas would be help full. I'm starting to think there is a problem with the command module. Thanks
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Tuesday, August 2nd, 2022 AT 8:11 AM
Tiny
KEN L
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A black spark plug can cause the misfire as well did you try a new plug? I have seen spark plugs go bad even new there can be defective.
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Wednesday, August 3rd, 2022 AT 10:48 AM
Tiny
RICHARDM021
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I will give it a try. Thanks. I will let you know the results.
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Wednesday, August 3rd, 2022 AT 1:01 PM
Tiny
KEN L
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Please let us know what you find. We are interested to see what it is.
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Thursday, August 4th, 2022 AT 6:19 PM
Tiny
RICHARDM021
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I did replace the #2 spark plug again. Still have the same issue. Don't know where to go from here. I have never had an issue like this before. Help
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Monday, August 8th, 2022 AT 9:44 AM
Tiny
RICHARDM021
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I also did the code reader. All I get is P0300 which is random misfire in multi cylinders.
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Monday, August 8th, 2022 AT 10:27 AM
Tiny
KEN L
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Okay that helps, when you get this code, it could mean the MAF sensor is not working correctly. Also, when you have the valve cover off did you check the camshaft lobe for wear?
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Monday, August 8th, 2022 AT 6:03 PM
Tiny
RICHARDM021
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I did look at the lobes. They looked fine. I will try the mass air flow sensor next. Hoping this works. Thanks
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Tuesday, August 9th, 2022 AT 4:32 AM
Tiny
RICHARDM021
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I have not changed the MAF yet. I think if it was the MAF it would affect all the cyl's. It is only affecting the # 2 cyl. The other do not misfire. Any thoughts on this. Like I said it affects the #2 cyl only. Thanks
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Thursday, August 25th, 2022 AT 11:04 AM
Tiny
KEN L
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Compression, fuel and spark, it has to be one of these.
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Thursday, August 25th, 2022 AT 5:20 PM
Tiny
RICHARDM021
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I replaced the control module. That fixed it. Thank you for all the help.
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Monday, September 12th, 2022 AT 9:07 AM
Tiny
KEN L
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Thanks for getting back to me, nice work, we are here to help, please use 2CarPros anytime.
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Monday, September 12th, 2022 AT 6:42 PM

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