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Old 10-21-2008, 01:09 AM   #1
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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?

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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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