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Unread 01-23-2014, 10:19 PM   #1
Firemandan
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1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla, Alabama
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Under powered 95 yj with a 2.5L

Ok Folks, as some of you know, I've just finished with my 95 yj to use as a daily driver. As I took it out for it's victory drive around the community, I noticed it was VERY under powered. It's a rebuilt 2.5L, 5 speed with 31" tires. She's real slow on take off. RPM's are pretty low " I think they are low"
I'm not an expert. I have to drop down to 2nd for some of the small inclines in the area. on flat road, I can get it up to 48-52MPH and that's as fast as I have gotten her. Just asking what could it be?
Is it gears?
a sensor?
the moon not being aligned with mars?
Help please

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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-23-2014, 10:21 PM   #2
Firemandan
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OH one of the most important things...........stock 4:10 gears
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-24-2014, 04:16 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
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Start with your codes.
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 01-24-2014, 08:24 AM   #4
Jeepsr4me
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Yeah computer could be gone or exhaust is stopped up.. Many things. But these little engines like to rev, so that should not be a issue.
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Unread 01-24-2014, 11:15 AM   #5
EABiker
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1989 YJ Wrangler 
 
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Location: Frederick, MD
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Does it run the same cold as it does when warmed up? The sensors really only come in to play after it reaches operating temperature. I would first look for a vacuum leak, especially around the intake manifold.
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Unread 01-25-2014, 07:36 AM   #6
Firemandan
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EAB, it runs the same at operating temp as it does cold.
I'm at the station today so I'm gonna check the codes out tomorrow when I get home.
I should mention that I do have a screaming demon coil and live wires with big gap plugs on it, just thought I should mention that.
Also, she's VERY cold natured, takes a bit to get her to start and after she's been run for a bit and sits for a few minutes she is slow to start.
Not sure if it could be a timing issue, what do y'all think?
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-25-2014, 08:16 AM   #7
Jeepsr4me
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check your fuel pressure
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Unread 01-25-2014, 08:36 AM   #8
Firemandan
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Thanks jeeps, I'll check that in the morning.

Good thought.
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-25-2014, 09:18 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
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Fuel pressure. 31 psi drinking. 39 psi after disconnecting the pressure regulator vacuum hose. Turn the key off. Pressure should stay above 20 for 20
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Unread 01-25-2014, 10:00 AM   #10
plumber1
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2005 TJ Wrangler 
 
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It's not gears, when my 2.5 YJ was on 31's I could go 65+ on the freeway on the flats w/o much problem. Now when I got to inclines it did suffer but never on the flats, it's no racer but I agree with the others you have something else going wrong.
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Unread 01-25-2014, 10:14 AM   #11
flcracker
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2.5, 5 spd, 4.10's and it gets up and goes just fine.... only had it on the Interstate once and it did 70, took a while to get there but it did 70....

edit: this was on 31's
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Unread 01-25-2014, 02:19 PM   #12
Kowalski
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Maybe it's the catalytic converter? Mine was stopped up and felt sluggish.
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Unread 01-25-2014, 02:30 PM   #13
Firemandan
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I put a new exhaust system on it, not saying it couldn't be the cat but Ill check.
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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Unread 01-25-2014, 07:42 PM   #14
Que89YJ
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Fault codes?
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Unread 01-25-2014, 08:27 PM   #15
Firemandan
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Que, I haven't ran the codes yet, gonna do it in the morning when I get home.
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[FONT="Impact"][SIZE="4"][COLOR="Black"]195? M38
1979 CJ7
1995 YJ [/COLOR][/SIZE][/FONT]
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