Question about 2004 Jeep Grand Cherokee

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Not shifting until 4000 rpms then very slow accel.

My 2002 JGCL 4.0 6cyl. wont shift until it gets to about 4000 rpms then has very slow acceleration. help please

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  • 475 Answers

Check condition of the tranny fluid it should be pink. Bring the jeep to a muffler place and have them check the cat convertor for blockage.

Posted on Jun 18, 2009

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Posted on Jan 02, 2017

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I have a nissan caravan, so I dont know how overdrive works, please help me!


if it is automatic then when the engine rpms is set to correspond with the tail shaft rpms then the transmission control module effects a change into over drive
If there is a change in conditions ,such as a loss of vacuum from acceleration , the TCM down shifts out of OD for better acceleration, return to od when things are again in balance
the same on slowing down--the tcm sensors report an imbalance so the tcm keeps shifting down until the car has stopped.

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I have a 2002 Celica GT 5-Speed and I shift at about 4k RPMs when getting on the highway and I still feel I'm accelerating to slow. Am i doing something wrong?


Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.

Nov 13, 2013 | Cars & Trucks

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My 2001 GMC Jimmy wont accelerate. The RPMs shoot up over 4000 in first gear until finally changing but then shortly after shifting I lose acceleration all together. If I turn the car of and back on again...


Is the check engine light on? See what it says. It may be transmission related. The leaking fluid is probably transmission fluid. If it's really low you'll have a problem.

Nov 10, 2017 | 2001 GMC Jimmy

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1992 chevy 3500 wont shift unless under hard acceleration


there is a transmission sensor on the top of your motor by the intake. it senses the accelerator or motor rpm's and tells the ****** to shift. its about 30.00 and easy to change. get it at any auto parts store.

Aug 26, 2012 | 1992 Chevrolet C/K 3500

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92 prelude si (auto)


With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.

Jun 14, 2009 | 1992 Honda Prelude

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Transmission wont shift until about 4000rpms from 1st to 2nd gea


Have a code check done and see if speed sensor or controller is working properly. if bought from a dealer, get it back there asap...they can't sell it in that condition!!...No test drive before you ploped down your money?

Apr 16, 2009 | 2004 Jeep Grand Cherokee

1 Answer

2002 Toyota Celica with a strange shifting problem.


Automatic transmission are complex systems. The shifting of gears is based on a number of things like bands, speed, acceleration, deceleration, manifold back pressure, RPMs, temperature, etc.
Sometimes the electrical ground connection for the transmission can become corroded which causes poor shifting.
Since you are getting an error code, you should get a readout for it. Many auto supply store like Advance Auto will loan a meter for you to get a readout. Call up some stores to find one.

Mar 18, 2009 | 2002 Toyota Celica

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