Question about 2003 Jeep Wrangler

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I own a 03 jeep wrangler TJ 4.0. At high rpms or under load (going up hills it looses power) if driving in 5th gear at 60 mph and is down shifted to 3rd gear it slows down extreamly, the engine will not go past 3200 rpms. Not moving if rpms can only go to 4200, past that it boggs down, as if it were getting starved from fuel or air. I have recently installed a high flow exhaust system that removed the two catalytic converters that were just past the headers, and i have been told it could possibly be a problem with the o2 sensors not measuring correctely due to the lack of the converters. I have been leaning towards that being the problem but i still have my doubts because there is no cel and the engine rattles/nocks execively past 4000 rpms. any advise?

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  • Anonymous Mar 28, 2014

    would not shift down going up hill and now it is stuck in first. I have been told the cataletic converter is the problem

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  • Jeep Master
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U only did part of the job most people change the air intake first put in a cool box or k&n type which causes some of same problems as opening the exhaust-- ur letting to much air out no back pressure and not enough air going in causing an imbalance also ur going to have problems with o2 sensors/cat sensors also mass air flow down the line

Posted on May 06, 2010

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I have a 2001 Ford escape xls 4x4 2.0 4cylinder and when driving down interstate at 75 mph in 5th gear my rpms are running at 3500. Is this normal or what would be causing this? It sounds like it needs a...


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can i assume you pulled the side plug on tranny and the level
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M/T tranny (not auto) what engine? the m./t varies by HP of ENGINE.
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gee the chutch is good.
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most tranny that fail to actual shift into gear
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so pull the shifter off top of the shift tower.
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1 Answer

Power loss at 4000 rpm


anything over 4K is pretty much above the useful torque curve of the engine. Therefore more rpm's will not do you as much good as you might think. If you intend to do any hill-climbing, you will need to begin by changing both front and rear gearsets (if you have say, 3:23's, go to 4:11's etc) You will also need to do some engine mods such as a different camshaft, headers etc. (this will alter torque curve)
Factory gears are generally installed to accommodate a certain region where the vehicle was originally sold. If the region is flat, then the gears will not work well in high terrain.
If you are not hill climbing and just have occasional problems with hills, There isn't really much you can do about it especially if you have a four cylinder in there. One thing though is that if you have oversized tires, get rid of them...they change your final drive ratio and definitely will influence your performance.

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