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Old 04-22-2011, 10:59 AM   #1
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distributor cap?

the check engine light came on again today... it seems to only come on when its raining and the codes show 1)random misfire, 2)misfire in cyl 2, 3)misfire in cyl 3. My limited knowledge makes me think cracked Distributor cap. Anyone have any other suggestions?

thanks

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Old 04-22-2011, 11:00 AM   #2
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Replace the cap, plugs and wires.

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Old 04-22-2011, 11:07 AM   #3
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i was having a pretty bad misfire, went to change out my dist cap , rotor, plugs and wires, found a solid 1/2" of mud in my distributor lol, cleaned it all up, has not done it again since
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Old 04-22-2011, 11:07 AM   #4
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Quote:
Originally Posted by jeepjones View Post
Replace the cap, plugs and wires.
X2. I'd also ask for a premium distributor cap and rotor that use brass, not aluminum, contacts which last a LOT longer. For the ignition wires, there are a LOT of poor quality aftermarket ignition wire sets that will just cause more problems than you can believe. They pull apart at the first spark plug change, cause radio noise, etc. so I would go to the dealer and get a set of the OE ignition wires which are very high quality.

Three good long-lasting (>100K miles) spark plugs include the Champion 3034 or Autolite AP-985 (both of which are platinum coated), or if cost is no object go with the new Autolite XP-985 which is iridium coated fine-wire technology.

Edit: Oh wait, do you have an 02 with the 4.0L engine? If so, you don't have a distributor cap, rotor, or ignition wires. And you'd need Autolite APP-985 or Champion 7034 plugs instead of what was recommended in the previous sentence, or the Autolite XP-985. If you have an 02 with the 2.5L engine, the first recommendations are still good.
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Old 04-22-2011, 11:45 AM   #5
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LOL, I didn't even notice the 2002 TJ in his sig.
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Old 04-22-2011, 11:56 AM   #6
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i use a borg warner cap been pretty happy with it, and it was $13, that is if you have a cap and rotor and not a coil pack lol
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Old 04-22-2011, 12:14 PM   #7
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sorry, yes, it's a 02 with the 2.5L engine
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Old 04-22-2011, 12:19 PM   #8
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Only when it rains is a good tip-off.

Use a spray bottle of water - spray it over the coil pack and around the plugs one at a time. If a plug boot is ripped or pulled up the high humidity can cause the spark to jump out to ground. If it misfires with the water spray you found it.

The boots are replaceable.

Works for all ignition systems too.
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Old 04-22-2011, 12:41 PM   #9
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whups misread

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