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Old 10-29-2011, 02:00 PM   #1
Join Date: Apr 2011
Location: Al Ain, UAE
Posts: 72
Learning as I go! Need the experts again

Hey all,

I have been fighting a few issues for a while now and need help with a new one.

92 4.0 ax15 100k miles

Started as: Stutter/stumble after each fill up. Fix=Fuel pressure regulator (jeep would run great when I plugged off the vac line from old one)

Stutter/stumble after 3 hours of serious dune bashing. Fix=TPS (old one shot bad...another great write up that I found on here)

New problem = running way rich at idle, smell fuel, sprinkles fuel out of exhaust, completely blackened new plugs in all cylinders after only 10 minutes at idle. Sounds like it is missing, but only every once in a while. all at idle. Not sure that I want to road test it until I can find a solution.

This came immediately after changing plugs and wires. Cap and rotor were installed prior. I inspected the Coil and discovered corrosion on the tip...here is where I may have gone wrong, I used sand paper to clean it up. Not to rough, but could this be what is causing my issue?

Thanks for all the help, you guys have kept me in the dunes out here!

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Old 10-29-2011, 03:32 PM   #2
Join Date: Feb 2011
Location: Michigan
Posts: 72
Double check the firing order. Cleaning the coil with sand paper shouldn't have caused any problem.

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Old 10-29-2011, 07:32 PM   #3
Join Date: Aug 2011
Location: north of St.Franisville La.
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Originally Posted by hghgrad View Post
double check the firing order. Cleaning the coil with sand paper shouldn't have caused any problem.

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Old 10-30-2011, 04:16 AM   #4
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Join Date: Oct 2011
Location: Mobile,
Posts: 91
Can't speak for a Jeep tune up, but after I replaced the cap, rotor and wires on my old Toyota with cheap after market ones from Kragens, it began doing the same thing. Put the old cap back on and it stopped. That is when I learned to use only FACTORY TOYOTA PARTS. Never had that problem again. Might try one from Chrysler. There is such a thing as defective new parts from the parts store. ESPECIALLY SINCE THEY ARE ALMOST ALL MADE IN CHINA THESE DAYS!!!
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Old 10-30-2011, 04:52 AM   #5
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Join Date: Sep 2011
Location: Weirton, WV
Posts: 93
Originally Posted by Hghgrad View Post
Double check the firing order. Cleaning the coil with sand paper shouldn't have caused any problem.

x3, i had the same thing happen, and we found my buddy mixed up 2 wires.
94 Jeep Wrangler - WIP (Work In Progress)
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