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Old 05-14-2007, 02:31 PM   #1
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No power

Hey guys, new to this forum & hoping to get some input from other jeep people. I have a 2000 Jeep Wrangler 4.0 - 5 speed that I bought 4 years ago (march 2003). It only had 42k miles on it when I bought it. This is my first Jeep to own and I really didn't know what to expect. It has never had great power since I bought it. I thought it would have more power and shortly after I bought it I carried it to a mechanic that did a tune up on it (plugs, wires, cap & rotor). It still had no more power than before the tune up. It runs great, no misses, no surges, no engine check lights, it just simply does not have the power I expected. It now has 92K miles and is still running the same as the day I bought it. I have put a K&N filter on it and it helped some but not much. After talking with a friend that has a Jeep he said it should have alot more power than it does. On the hiway top speed is about 75 mph going down hill. Going up hill it will lose 10-15 mph from bottom to top. If i'm running 70 and hit a hill it will drop to between 55-60 by the time I get to the top. Any suggestions as to what could be wrong or is this normal for a Jeep Wrangler?

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Old 05-14-2007, 02:34 PM   #2
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Is it lifted with oversized tires on it? Jeeps(Wranglers) have never been known for horsepower, and there really isn't a whole lot to do to make more other than a V8 swap or a 4.7L Stroker kit for the stock 4.0L motor.

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Old 05-14-2007, 02:47 PM   #3
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I do have a set of American Racing 15x10 wheels with 31x10.50x15 All-Terrain tires on it now, but I also have the original Jeep 15" wheels with 235/75/15 tires on them and it doesn't seem to make a difference which tires I have on it.
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Old 05-14-2007, 03:11 PM   #4
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Even with 31's it should be pretty snappy... and it will only do 75 down hill? I can easily do 80 or better and I have an Auto, even driving some of the steep hills on the way to Phoenix and back.

ITs not chugging or anything is it? Just slow?
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Old 05-14-2007, 03:31 PM   #5
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No chugging, no missing, just very slow. I have two hills on my way to work each morning that are about a mile long and I am amazed at how much power loss I have on these two hills. I have owned other vehicles with inline 6 cyl. that never lost as much power as this one does. I am at a loss of what to even look for. I have tried everything I know to try and I don't seem to be making any progress.
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Old 05-14-2007, 04:35 PM   #6
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Maybe jack up the rear and spin the tires, maybe the brakes are hanging up, frozen e brake cabe, broken return spring?
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Old 05-14-2007, 04:47 PM   #7
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My old 97 had a bad O2 sensor. Never gave me an SES light like it was supposed to, never missed or surged, just didnt have the power it should have. It did, however, emit black (rich) smoke at WOT sometimes, and it stunk like an old carbuerated muscle car when you got on it (running rich) which is how I found out what was wrong. May want to have someone hook up a scan tool to your jeep, and check the O2 sensor.
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Old 05-14-2007, 04:55 PM   #8
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It sounds like your axles may have the dreaded 3.07 ratio gears installed in them which is an economy vs. a performance ratio. Look for a steel tag held between two bolts at the 9 o'clock position of your differential cover. Your axle's ratio will be embossed into it and it'll say either 3.07 or 3.73.
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Old 05-14-2007, 06:21 PM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
It sounds like your axles may have the dreaded 3.07 ratio gears installed in them which is an economy vs. a performance ratio. Look for a steel tag held between two bolts at the 9 o'clock position of your differential cover. Your axle's ratio will be embossed into it and it'll say either 3.07 or 3.73.

Oh, Jerry.....don't say "dreaded", I'll get a complex

(gears are in my future, I'm looking forward to the "improvement" everyone talks about.......
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Old 05-20-2007, 11:58 AM   #10
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I vote gears.. what rpm are you cruizing at 70mph? I step on it at 70 on 5th.. it accelerates easily. I still havent tried to see when it will top off but looks like it will hit the block easily.
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Old 02-16-2010, 01:52 AM   #11
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Exclamation More power!!!

Go to rustys offroad on-line and buy there cold air intake and air intake spacer and it'll add a good amount of power. You don't have to use rustys but it's cheaper than most because it uses your stock hose thar leads to your air filter box so all you do is take off the air filter box and the kit comes with a bracket which uses holes from where your filter box was bolted down so no drilling needed then you attach your air tube to the bracket then add and brace on the included K&N cone filter and it's as easy as that. Then you need to install the aluminum tornado spacer which is also included with everything you'll need to install and I goes on top the intake which
is where your tube leading from the filter to the engine so just follow the air tube from the filter to where it attaches to the engine. If your the least bit capable of mechanicle things you can do it all in less than an hour. I for my from rustys the whole kit for about $160 but you can check around but it's the cheapest and least harmful way to add power with the kit I increased atleast 15to20hp and a mechanic said more like 25hp. Must have for all wranglers plus I increased gas mileage by three miles a gallon. That's huge
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Old 02-16-2010, 06:11 AM   #12
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Quote:
Originally Posted by Jerry Bransford View Post
It sounds like your axles may have the dreaded 3.07 ratio gears installed in them which is an economy vs. a performance ratio. Look for a steel tag held between two bolts at the 9 o'clock position of your differential cover. Your axle's ratio will be embossed into it and it'll say either 3.07 or 3.73.
+1 on the gears. Jerry's right. I can easily hit the Gov. in mine at 92 mph.
with 4.88's & 33's. Jeep's 4.0 is NOT a powerhouse by any stretch of the imagination. although it is a Torque monster for low end. If you want to get more power out of your engine put lower gears in the axles. even 4.10's will make a world of difference with 31's.. But if your gonna go bigger tires later go deeper gears now
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Old 02-16-2010, 06:20 AM   #13
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Old 02-16-2010, 06:26 AM   #14
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I talked with a mechanical engineer who was laid off from Jeep about a year ago. He said the 3:07 gears were used just to get EPA ratings. He said it is a poor choice for the vehicle.

I had 3:07 gears with stock 30" tires and was continually downshifting. Now I have 3:75 gears with stock 30" tires and it is much better. I think 4:10 gears would be best for me around SCal.

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