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Old 09-06-2011, 11:44 PM   #1
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PLEASE help misfire after seafoam

my jeep has 64XXX miles on it and i ran seafoam though the vacuum line and some though the gas tank, i did that like at 5pm, later on got in my jeep drove to my girl friends place, had it idling for like 15 minutes when i got there and turned it off when i got out, it set for like 3 hours, and when i was ready to leave, i started it up and it was misfiring, felt horrible. my cel was flashing, so i drove it home, and did the on off on off with the key, and it said p0301 and p0305, i know misfire on cylinder 1 and 5, so the next day i went out and got some champion copper spark plugs, gapped at .35, installed and torqued to specs, and still feels like crap. i switch the injectors and disconnected the battery to reset the codes. drove to school. when i got there i did the key thing again and still same cylinders misfiring, idk what to do, college student with no job and i rather fix it myself then take it to a shop, money is a little tight for now but i just want my baby to purr normal again,

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Old 09-08-2011, 05:39 PM   #2
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Try a new set of wires.

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Old 09-08-2011, 05:56 PM   #3
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What year is your jeep? If you have a coil rail, it might be possible that one of the boots didn't seat properly over the spark plug. That happened to me once.

Also - is it possible that your jeep just doesn't "like" the new plugs you used? Jeeps are pretty particular on plugs. I used Champion 7034 and they work great.
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Old 09-08-2011, 05:57 PM   #4
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If your carbon build up was quite great a piece of it that was dislodged from the cylinder may have chipped one of your valves
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Old 09-08-2011, 07:52 PM   #5
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Quote:
Originally Posted by MikalCarbine View Post
If your carbon build up was quite great a piece of it that was dislodged from the cylinder may have chipped one of your valves
This is a great possibility, But when you say that you would rather fix it yourself I would reconsider that. You could not even seafoam it correctly. It sounds like you have exceeded your mechanical abilities. It is time to take to to someone who knows what they are doing. I am sorry, I am only shooting it to you straight and free of bs
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Old 09-08-2011, 09:14 PM   #6
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Do a compression check, to rule out any valve damage.
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Old 09-08-2011, 09:47 PM   #7
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Yeah I'd be looking at the valves being a problem. May be something as simple as a piece of carbon caught between the valve and seat and it's causing a compression leak and your misses.
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Old 09-08-2011, 10:13 PM   #8
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It's a 2002 and tomorrow I plan on taking of the valve cover and take a look at the end of the valve stems and at the end of this month I get my pell grant money, instead of my lift kit and rims ( it's going to fix it, but its worth my wait, I love my jeep, and I need to get a compression check tester.
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Old 09-09-2011, 12:57 PM   #9
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Safe yourself the hassle of looking at the valve stems IMO and just go for the compression tester at Harborfreight tools. They run for about $20 and are well worth the money.
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Old 09-09-2011, 01:35 PM   #10
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Try a distributor cap and rotor, cheap parts, easy to replace too.
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Old 09-09-2011, 01:52 PM   #11
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Good deal! There is a harbort freight store about 25 miles, and I have a coil rail on my plugs
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Old 09-09-2011, 02:54 PM   #12
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Old 09-09-2011, 03:05 PM   #13
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this video is me driving it and it misfiring


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Old 09-09-2011, 03:10 PM   #14
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Do you own or know someone who owns a scanner? Check the o2's .. Seafoam can mess up o2 sensors and cat's.
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Old 09-09-2011, 03:10 PM   #15
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the one on the left is from cylinder 6 and the one on the right is cylinder 1 and sorry for the crappy quality of picture

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Old 09-09-2011, 03:13 PM   #16
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same plugs when it was running right

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Old 09-09-2011, 03:15 PM   #17
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what kind of scanner before i knew you could the key thing i took it to advance auto and they did the codes for me and with my new plugs in cylinder 1 has not fired, the plug is a little dirty from the gas but it does not have the black stuff on it like the others
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Old 09-09-2011, 11:23 PM   #18
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If it wasn't firing it would be sooty black and fuel soaked. Looking at your photo of the 6 plugs #6 and #1 are firing a little hotter then the rest.

It appears the center electrodes on them is nice and clean, the others have a slight build up of light brown on them which is pretty much normal.


And have to agree, pulling the valve cover isn't going to tell you squat on how the valves are. Run the compression check first. Read the directions, you need to do it right, and run both a dry and wet test to get the correct readings.
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Old 09-10-2011, 12:15 AM   #19
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Try a distributor cap and rotor, cheap parts, easy to replace too.
Real easy on his since he doesn't have them
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Old 09-10-2011, 12:43 AM   #20
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To my knowledge...usually after a seafoam app u are supposed to be prepared to change all plugs, oil and filter.


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Old 09-10-2011, 12:59 AM   #21
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I took of the valve cover to see if my valves were rotating and I replaced my plugs and oil, but not the filter since I did that like 700 miles ago, and I really need to get a compression tester and a week ago I was on ehow and they said you could clean off o2 sensors by soaking them in gas, so I did that for 8 hours, I put them back in and started her up, the idle was a little less rough but still misfiring, it's just killing me that I can't check the compression of my cylinders (((
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Old 09-10-2011, 03:03 AM   #22
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Originally Posted by Dinoelite View Post
I took of the valve cover to see if my valves were rotating and I replaced my plugs and oil, but not the filter since I did that like 700 miles ago, and I really need to get a compression tester and a week ago I was on ehow and they said you could clean off o2 sensors by soaking them in gas, so I did that for 8 hours, I put them back in and started her up, the idle was a little less rough but still misfiring, it's just killing me that I can't check the compression of my cylinders (((
I wouldn't soak them in gas, some O2 sensor safe carb cleaner would work best and it dries almost instantly. Also putting them back in soon after they were soaking could cause a short. They should sit in a warm dry place to make sure they are dried out well in the internal connector part.

Are you sure when working under the hood you didn't knock a connector or vacuum line loose. Sometimes it is the simplest things. I would put the old plugs back in, and do the sea foam again putting it in the brake booster line and IAC port while it was running, just keeping adding enough to make it run rough but not stall, you will see clouds of white smoke. Let it it then idle for a few minutes to clear itself out and shut it down and change the plugs. I have used seafoam in this way before and never had an issue with my O2 sensors after.
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Old 10-03-2011, 10:44 AM   #23
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Sorry I haven't been in here in a little bit. Let me update y'all! well I bought a compression tester and all my cylinders said 120, after that I went to advance auto and bought a coil rail and my problems were solved, it runs so smooth! And more power! So I can not blame this on seaform! Seafoam did its job and it was wonderful! ) happy to get my Tj running flawless now.

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