2.5L Runs rough at higher RPM under Load - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-30-2010, 10:08 PM
Thread Starter
  #1
Newb
 
Join Date: Mar 2010
Location: Central Ohio, USA
Posts: 2
OutdrzMan is on a distinguished road
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!!
OutdrzMan is offline   Quote
Old 03-30-2010, 10:16 PM   #2
Jeeper
 
McLovin's Avatar
 
Join Date: Feb 2010
Location: Waynesboro,PA
Posts: 127
McLovin is on a distinguished road
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.

McLovin is offline   Quote
Old 03-30-2010, 10:20 PM   #3
Jeeper
 
brent in az's Avatar
 
Join Date: Feb 2010
Location: Verde Valley, AZ
Posts: 580
brent in az is on a distinguished road
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?
brent in az is offline   Quote
 
Old 03-30-2010, 10:45 PM
Thread Starter
  #4
Newb
 
Join Date: Mar 2010
Location: Central Ohio, USA
Posts: 2
OutdrzMan is on a distinguished road
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.
OutdrzMan is offline   Quote
Old 03-30-2010, 10:49 PM   #5
Jeeper
 
McLovin's Avatar
 
Join Date: Feb 2010
Location: Waynesboro,PA
Posts: 127
McLovin is on a distinguished road
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!


McLovin is offline   Quote
Old 03-30-2010, 10:51 PM   #6
Jeeper
 
brent in az's Avatar
 
Join Date: Feb 2010
Location: Verde Valley, AZ
Posts: 580
brent in az is on a distinguished road
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.
brent in az is offline   Quote
Old 03-31-2010, 04:18 PM   #7
Jeeper
 
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,303
Garyk is on a distinguished road
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.

__________________
2013 WRANGLER SPORT 2 DR., V-6 ,AUTO,HARD TOP
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
Garyk is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
90 2.5 wouldn't start, now runs rough crbnfbr YJ Tech Forum 8 06-17-2011 11:56 AM
2.5 runs rough when cold JakeE YJ Tech Forum 1 02-28-2011 08:49 PM
'97 Wrangler Cold Idle / Load Flooding Problem brad07x TJ Tech Forum 1 12-18-2009 11:10 PM
'01 Sport runs rough cold engine sjb TJ General Discussion Forum 2 10-26-2009 05:47 PM
Runs rough after mudding, winch dead LIVE TO JEEP,JEEP TO LIVE TJ Tech Forum 8 12-03-2007 06:21 PM




All times are GMT -5. The time now is 05:51 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner