THE CAR WHEN IT IS IN OVER DRIVE WILL PULSE OR SURGE LIKE THE REV LIMITER IS ENGAGED. THE RPM'S ARE IN THE 1500 TO 2500 RANGE. CAN START AS LOW AS 35 MPH. NO CHECK ENGINE LIGHT ON, THE ONLY FAULT IN THE CAR IS THE GAS GAUGE DOESN'T WORK PROPPERLY.
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Nothing, you have hit the rev limiter. The up and down is the computer controlling the rpm. If you drive it, it should rev past 3,000. The computer is designed to keep free wheeling rpm to that level. It will only allow a higher rpm if vehicle is in gear and moving with a load.
You are hitting the rev limiter top range, which cuts off your ignition.
I have a 2001 Grand Cherokee and the problem drives me crazy, but it is the way the car is designed- as soon as you hit the rev limit, it shuts down ignition and your jeep will "buck" - a real pain when you are trying to accelerate into traffic!
You have the 4.0L straight six engine, yes?
If so, please take my advice and learn to live with the minor annoyance of the rev limiter- that engine is IMHO the best Chrysler ever made (nearly "bulletproof"!) and it was so reliable you cannot even get it in a jeep now! For decades, that engine was used in welders, tractors, generators...and yes, jeeps... and it is a favorite among mechanics for its durability!
To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.
With such high revving engines (me being a Honda fanatic) you need to keep an eye on oil levels. Check the level, top up as necessary. Without the correct amount of oil in, the oil pressure cannot stimulate the switch over cam, which takes it to 8500rpm.
Also, please don't rev you car without load (ie. standing still), this causes valve lash and is detrimental to the engine. Again, please do not rev your car hard without letting the oil get up to temperature or it won't last long :)
Once you check your oil, reset the ECU by pulling the battery lead off for around 20 minutes.
Good luck and have a blast. Could you vote for me if this helps you. Thanks.
the rev limiter is not a part, it is built into the programming of the computer that runs the electronic fuel injection, some of the more popular performance cars can be programmed to change the rev limiter paremeters with after market software and modules but not this one, no one makes anything for this yet.