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Jeep Wrangler, Scheduled Maintenance, Steering, Suspension, Tires, SUV
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May 14, 2007 (9:43 am)
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?
#879 of 1888 Re: No power [acordell]
May 14, 2007 (10:30 am)
It's hard to tell without driving it (or you driving a similar one), though do remember that fifth gear is an overdrive and you should change down if you get on a slope.
However, 75mph downhill isn't good. The first thing I'd check would be to see if the brakes are binding.
#880 of 1888 Re: No power [mac24]
May 14, 2007 (11:20 am)
Thanks, but I've already checked the brakes. It is free-wheeling and is not binding in any way.
#881 of 1888 Re: No power [acordell]
May 14, 2007 (11:57 am)
Ok, let's try a longshot. It's possible that for whatever reason, you have the wrong speedo gear fitted. Have you established that the speedo is accurate? The easiest way is to use a handheld GPS.
#882 of 1888 Re: No power [mac24]
May 14, 2007 (12:04 pm)
I have verified the speedometer is correct. Been clocked on radar and was accurate.
#883 of 1888 Re: No power [acordell]
May 14, 2007 (12:16 pm)
Final suggestions. A gradually failing OČ sensor can degrade performance without throwing a code. Also, a blocked, or partially blocked catalytic converter can do the same thing. You have two small ones on the exhaust manifold and it's possible that one could be good and the other blocked.
#884 of 1888 Re: No power [mac24]
May 14, 2007 (12:53 pm)
Thanks for the suggestions. I have not replaced the OČ sensor. Are there two OČ sensors? I have not checked the catalytic converter either. Do they make a test pipe for it or will I need to replace the converter?
#885 of 1888 Re: No power [acordell]
May 14, 2007 (2:35 pm)
You could have two, four, or even six OČ sensors. They're always in pairs, one before and one after the cat. Take a close look at your system to see what you've got.
The pics show the exhaust system, sensor locations, and the exhaust manifold. The yellow highlights on the manifold show the sensor locations as well.
I don't know of a test pipe for the Wrangler but it wouldn't be too hard to fabricate one for the main cat.
#886 of 1888 Re: No power [mac24]
May 14, 2007 (7:45 pm)
C'mon guys! That's O2 - not O-squared!
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#887 of 1888 Re: No power [tidester]
May 14, 2007 (8:19 pm)
If I have to remember one thing it makes be forget another. By the time I've remembered not to call it a lambda sensor I forget to subscript the 2.
Nah, it's just one of my many blind spots.
Now, if you could do something about CarSpace continuing to hide my pics?