'94 YJ 2.5L Running Like Poo... - Jeep Wrangler Forum

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Old 10-21-2008, 01:09 AM
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'94 YJ 2.5L Running Like Poo...

I have a 1994 2.5L YJ and it runs really rough half the time... I was thinking that it may be just because of the cold, but it's been running badly even when the engine is warm. I changed the plugs and wires just for good measure, and it didn't make a difference... The truck is running with 20W-50 oil because it has over 180000 miles. What could be causing the truck to run rough? It was running badly before the oil change, by the way. A guy at a parts store told me to put in thicker oil because he said it would quiet the lifter tap, but it's louder than ever... Can you guys help me diagnose it?
To do list:
1: Replace Radiator and hoses

2: Replace Power Steering Pump

3: Repair Floorboards and Seal Tub
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Old 10-21-2008, 11:19 PM   #2
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rob a bank. then buy a new jeep.

lol.. idk man sounds like shes dying. 94 is old! i had put in a rebuild in my ride. its sad but its whats best.

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Old 10-21-2008, 11:34 PM   #3
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personally i would not run that thick of oil in the summer and definitely not in the winter.
Mine had some lifter tick in the cold. I pulled the valve cover and just re torqued the rockers to spec. that stopped mine

I would do a distributer cap and rotor if they are old for starts.

There are plenty of 2.5s on here with 200k+ so i would hold of on a replacement until it blows up. but thats just my opinion.
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Old 10-22-2008, 08:38 AM   #4
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I wouldn't jump on a replacement yet, either. These things are tough. If it's a "half the time" issue, my guess is either a sensor going wonky, connection to a sensor going wonky, or a vacuum leak. If you have access to a code scanner (wish you were closer, I have a SnapOn MT2500 that'd be perfect, saved my a$$ many times!), check your live data and see if anything's out of range. Also, start the engine and listen to various places and see if you hear a hissing sound (vacuum leak). Most, if not all, of the hoses are still available from Mopar if you have a bad one, or you can just get a roll of right-sized hose from Autostoned or a similar parts house.

The other thought I just had - how long since you replaced the fuel filter?
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Old 10-22-2008, 12:13 PM   #5
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I would recomend doing a compression test,before spending money on parts you may not need. Always a good idea to check the simplest things first. Buy a manual,they have step by step procedure's how to do it. You could probably borrow a compression tester from somone. This will tell you if your are having engine issue's and where they are.
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