Bogged Down, P0301 code, Stinky Exhaust... and road trip in 15 days - Jeep Wrangler Forum
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Old 06-19-2014, 12:28 PM
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Bogged Down, P0301 code, Stinky Exhaust... and road trip in 15 days

Alright, yesterday was driving down and had a major backfire. Pulled over and Cyl. 1 spark plug dislodged itself. Managed to tighten it in to the point it was tight. Started driving and CEL P0301 came on. I just replaced the spark plugs about two weeks ago.

Got home and reset it, since that should have been the cause, everything ran great for 30 mins to work, until I got right off the highway and my exhaust started popping, P0301 came back on. Engine is bogged down, very loud. Plus the exhaust smells like rotten eggs. I have a Banks exhaust. Could a cylinder backfire cause a rotten catalytic convertor?

4.0L I6
140k miles
Banks exhaust

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Old 06-19-2014, 06:02 PM
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Oh shit dog, removed the spark plug to find this.


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Old 06-19-2014, 07:03 PM   #3
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pull all plugs do a compression check might have a hole that piston


I had a plug pop out while driving a v6 turbo just put plug back in and all fine

You have more than a plug that worked loose

had an engineering professor that got a hole in piston on a straight six 240z and the plug ignited fumes in crankcase and shit out most of the oil

He removed the plug on affected cylinder put in new oil and limped home

You high res photo crashes my hand held had to go to laptop to see your photos
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Old 06-19-2014, 10:19 PM
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I'll be doing a compression test tomorrow morning, nervous at what I'm going to find. Luckily, I have another car to drive with my TJ is out of commission. But I was planning on a road trip mid-July and wanted to get it back running.
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Old 06-19-2014, 11:37 PM   #5
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The bogging down and the rotten eggs smell from the exhaust are signs of a bad cat converter.
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Old 06-20-2014, 07:56 AM   #6
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Not the destroyed spark plug no way a cat could do that
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Old 06-20-2014, 02:47 PM   #7
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I'm going to assume the plug got bent when it popped out, and that you hadn't been running like that for 2 weeks. That could have killed your cat though; a bunch of unburnt fuel dumped through it at temperature will clog it right up and smell like roadkill omelet. The unburnt fuel and backpressure from the clogged cat also explain your backfiring and bogging.
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Old 06-20-2014, 08:31 PM
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Good News Everybody!

I did the compression test from cold (since I can't start the Jeep) and got 120psi from all except 4 which was a 135. Let's me know that internally everything is probably decent. I replaced the plug with a new one and new wires, and it's running strong again.

It had stored two codes P0301 and P0304. I cleared them and drove about five miles with no noticeable loss, even up to 65mph. however, the exhaust still sounds rough and I'll take it to an exhaust shop tomorrow. Thanks again so far for all the help and suggestions. I'm thinking CL it right on the head that when I replaced the spark plug I pulled a newbie move and didn't check the gap then. I'm going to take it easy driving with it for the next two weeks and see what it will replicate. Hopefully that takes care of everything.

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