Cylinder 5 misfire - JeepForum.com
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post #1 of 17 Old 02-10-2006, 11:34 AM Thread Starter
WVMIKEsTJ
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Cylinder 5 misfire

Here is the specs.

2000 jeep wrangler
4.0L
115,000 miles
oil/filters changed and everything greased religously

a couple weeks ago enigne light comes on and it say "engine 3 and 5 misfire." Last year when this happened I cahnged plugs and all was fine, but this time I cahnged plugs with the NGK plugs and all of a sudden the light stayed off for about a week and it came back on. Nothing seems weird with how it runs. Since I put the new plugs in it runs smoother than ever and does not act weird at all. On the computer t the dealership i watch the counter count the misfires.

What could it be?

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post #2 of 17 Old 02-10-2006, 11:35 AM
RockRunner85
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Injectors can be the cause of a thrown misfire code.

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post #3 of 17 Old 02-10-2006, 11:39 AM
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Could be that alot of people have trouble with this type of plug in a Jeep. The best plug would be a Champion truck plug. This plug was designed to run in a Jeep.

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post #4 of 17 Old 02-10-2006, 11:51 AM
jeeptj19992001
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wires go bad as well

03 rubi....growing bigger and better every day...
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post #5 of 17 Old 02-10-2006, 11:59 AM
meengineer2006
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IMO Champions are worthless. Bosch or NGK are the plugs to use. I don't even use Champion in my lawn mower. Repeated bad experiences with Champions, I'm not hating on anyone.
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post #6 of 17 Old 02-10-2006, 12:25 PM
SeanCucf
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bosch???? have you tried them in a 4.0? Please don't use those.

another vote for champion(i use the platinums however and don't know the part #)

On topic: Could be the coil pack too. I never looked to see if you can move the packs around on the rail, but switch #5 with another pack and see if the misfire changes cylinders. Or do the same thing with the injector. Maybe you can eliminate problems and narrow the search down.

sean
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post #7 of 17 Old 02-10-2006, 01:40 PM
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Another vote for do not use Bosch plugs (especially platinums in the 4.0) you are hear by forbidden!!! I would run some seafoam through the intake and give a good cleaning to the injectors and see if that helps anything first, just make sure you're able to change the oil afterwards.
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post #8 of 17 Old 02-10-2006, 01:44 PM Thread Starter
WVMIKEsTJ
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I ran the foam from chrysler through it, and put some Marvel Mystery oil into the oil the other day. So tonight I am going to change out the cylinder 5 plug. If that does not work I am going to switch injectors.
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post #9 of 17 Old 02-10-2006, 02:40 PM
mcfoley
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Keep me posted, I have a misfire code too... I replaced the plugs, wires, etc and replaced the injector too...Can't diagnose.
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post #10 of 17 Old 02-10-2006, 02:46 PM
TJ_Firefighter
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not to steal the post but what's the deal against bosch platinum plugs??? what about auto lite platinums? are they ok to use?
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post #11 of 17 Old 02-10-2006, 04:29 PM
ak-rider
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After 185K miles I just started having misfire codes pop up. Seems I have a worn distributer that may be causing it. I haven't swapped to a new one yet, so it may not have anything to do with it, but.... might want to check.
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post #12 of 17 Old 02-10-2006, 04:49 PM
o2tj
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dont swap the dist. just go to your local auto parts store and pick up a new pick up for it. It sits under the rotor in the dist. after the install flash your computer. If you dont the code will still pop up after you change the parts.
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post #13 of 17 Old 02-10-2006, 05:08 PM
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Quote:
Originally Posted by ak-rider
After 185K miles I just started having misfire codes pop up. Seems I have a worn distributer that may be causing it. I haven't swapped to a new one yet, so it may not have anything to do with it, but.... might want to check.
thought in 2k they switched to coil pack??? may be wrong though


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post #14 of 17 Old 02-10-2006, 05:17 PM
o2tj
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1/2 and 1/2 some came with dist and some came coil packs, thought I read he had wires? if not never mind..................lol
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post #15 of 17 Old 02-10-2006, 06:02 PM
adp5025
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Not sure what the problem is but jeeps dont like NGK and any other brand like that.

Replace with:
Champion truck plugs or Autolite single Plat.
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