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Old 01-25-2012, 10:39 AM   #1
Chris65GMC's Avatar
Join Date: Mar 2011
Location: Philadelphia
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2003, 2.4 , rough running

My jeep has had a small popping sound out of the exhaust when i cold start it, it also has a 'now and then' stumble /surge around 1500-3000rpm, the stumble is big enough where i can hear the engine rattle on a few occasions.

Any ideas? I'm thinking it could be as simple as bad gas, or we've been having weird weather in the NE, maybe the weather is tricking the cpu to lean out because it's 50 degrees, then it's running to lean the next morning when its 25 degrees? This started overnight, and has not been going on long.

Thanks for all help!

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Old 01-25-2012, 06:12 PM   #2
Join Date: Mar 2011
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I also have a 2.4L it's an 06
I first try and run the blue sta-bil through a full fresh tank. It breaks down the ethanol. Then I would get a can of mass air flow sensor cleaner. Remove your throttle body. And spray it all down and wipe all the crap out. Try those and also defiantly change your spark plugs while the throttle body is off. I recommend just basic champion plugs. And a new air filter wouldn't hurt either. Try those and let me know how that works!!

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Old 01-25-2012, 10:17 PM   #3
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Potentially O2, I had a similar issue and O2s fixed it.
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Old 01-26-2012, 08:30 AM   #4
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Originally Posted by ellman605 View Post
Potentially O2, I had a similar issue and O2s fixed it.
Thanks for the info, I'll look into a few of these.

The ECU is not throwing any codes, and it only has 58K on it, but the 02 is worth considering.
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