YJ problems, maybe cap and rotor. HELP!!! - Jeep Wrangler Forum

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Old 01-31-2013, 11:09 PM   #1
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Angry YJ problems, maybe cap and rotor. HELP!!!

I have a 1990 Jeep Wrangler, 4.2 inline 6. Has a weber carb (with snorkel), msd ignition / coil. Had it out today and ran great. Seems like was ok off road until I got onto open roadway, then noticed loss of power, minor backfiring, and stalled when came to stop. Longer it sat better it ran but still running a little rough, no issue starting. Me being a unknowledgeable mechanic touched top of distributor, believe one of wires and got one hell of a jolt, is that normal? and two does this sound like a wet distributor cap? has new wires and plugs, cap and rotor are recently new as well but did go through some good puddles today. Happens often, mostly after being in woods. Help!!!! Has no cats, just believe a cherry bomb muffler, maybe exhaust issue loss of power? anyone have same issues? WHen initially happens I can barely move mave to nurse it to accelerate cause has no power and stalls when accelerating. Seems longer sits better it gets but still idles a little rough, backfires, and noticed jeep was shaking.
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Old 01-31-2013, 11:42 PM   #2
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Could be water in the cap. When you go through the puddles or water steam will rise and go into the cap so will water spray they aren't selaed. You can remove the cap and rotor very easily and dry with a hairdrier. If you have some WD-40 spray a very light film on the cap and reinstall.

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Old 01-31-2013, 11:51 PM   #3
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I do get alot of steam that rises, sometimes into passenger compartment. Whats best way to seal? should I spray with wd40 on exterior of cap and wires also? are these def symptoms of moisture in cap?
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Old 02-01-2013, 12:22 PM   #4
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Yes and Yes. Go to the parts house and ask at the counter what they have for water repellent/protection. Its been several years since I bought anything like that. Here in the desert we don't have thos eproblems. If you look at the cap it isn't sealed at the bottom so the steam will rise and form on the inside top of the cap. You should be able to remove it and see it.
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