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Old 03-30-2010, 10:08 PM   #1
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2.5L Runs rough at higher RPM under Load

Hi Ya'll-

I just brought home my "new" Jeep YJ. It's a 1995, 2.5L with 55k original miles on it. It was a sweetheart of a deal!

The guy I bought it from used it as a "summer toy" - and It has spent most of the last 14 or so years parked in a garage. I had a 90 mile highway drive to get it home this evening, and I noticed the following:

When starting from a dead stop, it acted like it wanted to miss when I was accelerating and the engine was under load. Warm engine or cold, it didn't matter. Idle was fine, but under a load it sputtered.

I also noticed that it was having a hard time holding 65mph in 5th gear going up slight inclines on the highway. It was hard to hear/feel with the wind noise - but I suspect it was sputtering then also.

Now... I'll admit straight-away that I'm new to Jeeps - and am also new to being my own mechanic (ex: I change my own brakes and oil, but have never replaced a clutch or transmission...). that being the case, if you toss out an acronym, please tell me what it means.

Back to the Jeep... I'm thinking that all the years just sitting have left a "varnish" in the fuel system... and that the problem is likely one (or more) of the following:
1. Old Gas
2. Lame fuel Filter
3. Partially plugged injectors
5. Bad plugs
6. Bad ignition wires
7. Something else entirely...

The gas thing is easy enough to take care of. What else would you folks suggest as far as a course of action to iron out the problem?

Are there any good fuel system cleaner additives or are they just a scam?

I'm all ears... Thanks!!

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Old 03-30-2010, 10:16 PM   #2
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Id start with the free stuff. Pull your plugs and see what they look like. It will help tell if there is even a probelm. Our 4cyl are pigs. They tuck their tails at the sight of an incline so 4th gear is our best friend.

Dont worry I love my 4cyl the way it is. Wouldnt trade my baby.

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Old 03-30-2010, 10:20 PM   #3
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Congrats dude---55K is a SWEET deal.

But hate to tell you this. AMC made your engine and it is bullet proof.
This engine is also so weak it can't take any kind of road grade (slight incline).

So under load I'm not surprised by anything you say here. Hell, I'm suprised you attempted a load. You got some juevos.

HAHAHA!----you went UPHILL at 65 under load?? You can't go 65 uphill with no load!!

Dude, you got a deal. I think the jeep is healthy. In other words your 150 is not cut out for towing action.

This is a fun offroad and city engine. Not towing...I think the load is clouding your whole perception as far as a varnished system.

But that's just me. I'm sure you will get dissenting opinions...how does it perform with no load?
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Old 03-30-2010, 10:45 PM   #4
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Just to clarify... I wasn't towing anything.

When I said it was under load, I meant that the engine was trying to "push" the jeep to go faster.
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Old 03-30-2010, 10:49 PM   #5
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Very normal for our engines. I wouldnt worry. Id flush all the fluids from sitting so long front to back with fresh fluid. Itll be running like new. Im jelous. I have 150,000 on the clock as of now!


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Old 03-30-2010, 10:51 PM   #6
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Quote:
Originally Posted by OutdrzMan View Post
Just to clarify... I wasn't towing anything.

When I said it was under load, I meant that the engine was trying to "push" the jeep to go faster.
Then I would qualify engine performance as normal to above average.


You just got it. Play around a few weeks. Complete fluid change, tune up top to bottom. It still won't drive up a slight interstate grade, but you'll see the pros and cons right waway. You've seen the cons as far as strength. Not necessarily a bad thing at all.
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Old 03-31-2010, 04:18 PM   #7
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Like mentioned, change all fluids and do a decent tune up, plugs, wires, cap, rotor, fuel filter, air filter etc. It couldn't hurt to run a few tanks with some injector cleaner it either.
55,000, wow....that's a pretty good deal.

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