Car is jamed, dont accelerates and rpm limits to 2 or 3, as soon as it reaches to 3 so it knocks n comes down to 0 and engine gets off, i changed its fuel pump n fuel filter but it dint bring any improvement.. help me out plz..
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SOUNDS LIKE YOU HAVE BEEN VERY BUSY,THE ONLY THING I CAN THINK OF TO CHECK WOULD BE THE EXHAUST FOR RESTRICTION (COLLASPED PIPE,MUFFLER ,CAT CONVERTER) HOPE THIS HELPS .LET ME KNOW.
most likely an rpm limiter sensor that prevents you from blowing the motor
moving from 1st to 2nd or any gear should be done at no more than 4000 rpms as the engine is outside the torque range and is just a waste of fuel
Neutral or Drive N rev limiter to prevent engine damage from no load over acceleration. D: many things could be at fault. Has your fuel filter been changed in the last 30,000miles. What about a tune up? Is your CEL(Check Engine Light) on? If so have a parts store check for codes, some do it for free. Then get back to us and we can go from there.
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!
It could be engine detonation or knock. If so it is terribly damaging to the engine and must be totally avoided. Try using premium unleaded petrol for a trial, Or add some "ignition control additive" or ad some Methyl Benzene to the fuel. The anti knock sensor should control this but not all cars had these, or yours may have failed.
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