4.0 Loses power at highway speeds - JeepForum.com
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post #1 of 3 Old 06-07-2016, 06:51 AM Thread Starter
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4.0 Loses power at highway speeds

Hello, I'm new to forums, so here I go. I bought a 2002 WJ a few months back, it will accelerate to 60 with no problems if I floor it. The problem is if I take off normal, it seems to shift early into higher gears, leaving it no power and I can floor it and the rpms will stay the same or even lower. If Iím driving along at 55 and go to pass, I have to press the O/D off button on the gear shifter to get any acceleration. Just last week, it was beginning to start out in 2nd gear only, so I replaced the transmission pressure solenoid and sensor, which corrected that problem, but not the incredible loss of power. Please help.

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post #2 of 3 Old 06-10-2016, 09:54 PM Thread Starter
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Well, since no one decided to help me out with my problem, I went to two mechanics who both told me to go see a transmission specialist. So I called a few transmission specialists, who both thought my Catalytic converter was clogged. My question is from a dead stop it will go 0 to 70 with no hesitations, but the second i let off the throttle and hit it again, it loses all power. It won't down shift. So after a bit more research and testing, I determined that It is most likely the Throttle Position Sensor. I replaced it and the jeep runs like i guess would be new. This also corrected my high idling problem.

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post #3 of 3 Old 06-11-2016, 09:24 PM
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1989 YJ Wrangler 
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You might have gotten better response had you posted in the WJ tech section...

1989 YJ - 4.0L
2001 WJ 4.0L
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4.0 , high rpm , loss of power , tps

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