Cant figure out why my TJ is lacking power. -
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Go Back > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Cant figure out why my TJ is lacking power.

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Unread 07-11-2014, 06:09 PM   #1
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2002 TJ Wrangler 
Join Date: Jul 2014
Location: Shelby, Michigan
Posts: 1
Cant figure out why my TJ is lacking power.

To begin with, I am new to wrenching on my own vehicle, and really don't know what I'm doing at all. I just bought a jeep with a few problems with the intention of learning a few things. And so it begins...

I drove through a fair amount of water. The jeep is capable of passing through that depth of water, just not at the speed I was traveling. She stalled out and I had to wait a few minutes before it would start up again, but when it did it drove fine.

Two days later the girlfriend and I go out to enjoy the wilderness in our new toy, and it begins to chug and was requiring high RPM's for not so high power or speed. Within a few minutes of this obvious difference in performance it stalled and would not start at all. So, I towed it home.

Some two weeks later I have noticed a bad fuse and some electrical smoke while trying to get it running. I pulled my head light fuse and replaced the bad one and it started, but still barely drives. I can barely get it in to second or third gear and might max out at 35 or 40 mph on flat concrete. Again, it seems like I have to really get my RPMS up there to be able to get any sort of power from the wheels. And even then, it's barely enough to get going.

I have replaced all of the spark plugs and the "Ignition Coil Rail Pack" or whatever it's called because I thought I had destroyed a coil pack... Nothing changed.

I hope I have explained this well enough. I look forward to hearing some advice. Thanks

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Unread 07-11-2014, 06:19 PM   #2
Jerry Bransford
Do it right or not at all
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2004 TJ Wrangler 
Join Date: Jan 2003
Location: Escondido, California, California
Posts: 60,353
What size tires and which transmission are you running? And if you know your axle ratio, post that too. The axle ratio is stamped into a small tag at the 9 o'clock position on the axle's differential cover as shown below. How deep was the water the Jeep stalled out in? And when you said "just not at the speed (you) were traveling", what speed was that and were you in 2wd, 4Hi, or 4Lo?

And a big welcome to JF!

This tag is indicating the axle has a 3.73 ratio.

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Unread 07-11-2014, 07:53 PM   #3
Running Secretly Amok!
2002 TJ Wrangler 
Join Date: May 2007
Location: Ventura ,CA., California
Posts: 9,678
You need to fill out your profile so people know what you Jeep is made up of, it will help in answering your questions.Welcome to JF!
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Unread 07-11-2014, 11:51 PM   #4
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1998 TJ Wrangler 
Join Date: Jan 2009
Location: Sheridan, wy
Posts: 93
Welcome to the forum.
Lack of power would have me checking air filter
Timing light to check for bad plug wire or just replace them
Distributor cap, may have gotten wet
In neutral/park can you get it to rev up with out any kind of issue?
Possible weak or bad fuel pump or filter
Like said before it would help to get your profile set up too.
98 TJ, 5 speed, Dana 30 and super 35, 4.88 gears, Detroit in rear, ARB front, 33" tires, 4" procomp lift, smitty front fenders, rock sliders and armor, XRC 10K winch, custom bumpers, Atlas II 5.0:1
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