Help Jeep Bucking/ Power Loss -
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post #1 of 9 Old 08-03-2005, 02:40 PM Thread Starter
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Help Jeep Bucking/ Power Loss

undefinedundefinedundefined I have a serious problem with my jeep grand cherokee... 1996 V8 Limited edition. 2 weeks ago it would not start, so I took the starter down and it was bad. I replaced the starter and found the battery was bad, so I replaced that. Immediately following my jeep began to make these big jerking/ bucking actions when I would go into higher rpm's on the highway... I only noticed it when I would try to accelerate fast. I have cleaned the injectors, throttle body, put a new solenoid in, new fuel filter, tested the fuel pressure, cleaned the gas tank, put new spark plugs in. I hooked the car up to check the computer for diagnostic codes and there were none. We also checked the car for codes while driving it while making it act up and none. On Monday I drove it and noticed the ABS light came on for awhile and I could hear the fuel pump humming so I rechecked it when I got home of course by then there was no humming and no light on and the test was normal. Also, Monday the car died while idling in a friends drive way with large knocks under the hood before it shut off. When I went to accelerate on the high way it would barely move it began bucking and then I had to shut it off and it restarted fine and made it home... I did this check immediately following this. I rechecked the fuel pressure it was fine! Now what? Could it be the fuel pump since it was humming? or is it the Governor Pressure Sensor? I am lost? Maybe the EGR VALVE? I have put tons of money into this already! I don't see the point of taking it to a shop when the machine will not pick anything up. Any suggestions... the reason I have not taken steps to replace the Governor Pressure Sensor is because it still bucks when the radio and etc. are off? THanks a bunch!!!

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post #2 of 9 Old 08-03-2005, 02:43 PM Thread Starter
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Forgot to add...

Also, when you push on the gas and it begins bucking it sounds like some kind of rattling noise under the glove box... and when it would hardly move it made the big huge knocking/banging noises under the hood every time I pushed on the gas! THanks again!
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post #3 of 9 Old 08-05-2005, 07:34 PM
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This may sound kinda stupid but I had some weird things go on with my jeep about a year ago. First a new battery can be bad from the get go so recheck that. Mine acted up when the battery was bad. The second thing that comes to mind is the o2 sensors. I have two on my jeep and was having a real rough idle periodically, lights coming on all kinds of weird things, replaced both o2 sensors and everything went back to normal.
Good luck!
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post #4 of 9 Old 08-07-2005, 12:27 AM
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Loss of power when trying to accelerate? A clogged cat converter can cause this... might also be part of the rattle you hear.

Also try the O2 sensors like stated above. Since you have a '96 genuine mopar O2 sensors are reccomended for best results

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post #5 of 9 Old 08-07-2005, 12:38 AM
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MAP sensor could be a good cause of it as well..

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post #6 of 9 Old 08-07-2005, 12:40 AM
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I would double check that the spark plug wires are connected to the correct cylinders.

I didnt see you mention if you put new wires in or not, but that could also cause it.

Had a toyota once that it almost felt like you were hitting on the brakes (Bucking) when accelerating, had a bad ignition wire..

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post #7 of 9 Old 08-07-2005, 08:05 AM
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Originally Posted by
I would double check that the spark plug wires are connected to the correct cylinders.
That sounds like good advice to me. I would also replace the plugs and wires for good measure. I also like the cat advice. That can do the same thing.

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post #8 of 9 Old 09-29-2005, 09:32 PM
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Did you ever find out what caused this? Mine is doing the same
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post #9 of 9 Old 09-30-2005, 05:07 PM
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I had something similar happen to me. My error codes said I was miss firing on some cylinders and the dealer said I needed new spark plugs, wires and a fuel injection cleaning. I went home did the work myself and no change. I went to another mechanic and they immediately discovered I had a blown head gasket. The funny thing was I was not overhaeting or anything. They said it was a miracle I was still driving. I went back to the dealer because I was still under warranty and they said that if after they had done all the other things suggested( not covered by warranty) and I still had the same problem they would have looked for further probs. Long story short I went through the same check list you are and a blown head gasket was the end result. Good Luck.
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