HELP!!! 1994 Jeep YJ 2.5L Random Misfire - Jeep Wrangler Forum

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Old 02-09-2017, 09:46 PM   #1
Join Date: Feb 2017
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HELP!!! 1994 Jeep YJ 2.5L Random Misfire

Hey all,

I am new here so I apologize in advance if this is a re-post. So to begin with, my YJ has been misfiring lately and I cannot seem to find out what is causing it this time. It misfires heavily when on the interstate (its a 3-speed automatic so when I'm going 60+ its at high rpms) and when I'm going uphill so generally when its under load, but occasionally Ill get a random misfire or two when in town at lower speeds as well. This past summer my fuel pump/sending unit went out so they have been replaced along side my fuel filter, plugs, plug wires and about 5 years ago the distributor cap. I am at a complete loss at what is causing this, if anyone has any information on this problem at all please let me know.

Some background info is that it has 150k miles, it seemingly makes oil slowly disappear (no smoke nor oil spots, possibly a valve seal) and this past couple times my spark plugs were fouled. (ash white electrode with black burn looking marks on the threads and bottom of the electrode)
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Old 02-09-2017, 11:24 PM   #2
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Since you also have this in the tech forum, I'd recommend sticking to that thread to avoid confusion.

1994 YJ 2.5l Misfiring Issue
Build thread for OJ, my YJ. 1993 Wrangler S 2.5L/AX-5/NP231, Spartan Locked Dana 30/open Dana 35 @ 4.10, 2.5" OME HD springs and Rancho RS5000 shocks, Barricade 9500 winch, custom front and rear bumpers, 136 amp alternator, 30" General Grabber AT2 tires.
1990 Yamaha TW200.

Jeep manuals? YJs, TJs, XJs, WJs, ZJs, parts, electrical, powertrain.
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2.5l engine , engine problems , misfire , wrangler yj

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