Question about 1994 Jeep Grand Cherokee

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1994 Jeep Grand Cherokee Knocking/Thunking Noise

I was driving uphill and all of a sudden it made a big thunk, now there's a knocking noise when I drive. It only knocks when I push the gas pedal, not when idling or braking. I just put oil in her about two weeks ago, all the electronics still work, it has no problem starting. The display has said to get the 4 wheel drive switch serviced since I got it about a month ago, which I was told was a computer glitch.

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  • 17 Answers

Are you saying youv only had this vec. About one month? If so you may have bought some else,s problem. Go back and see if you can learn more info. If youv had it for a while could be jumped timeing but am just guessing.

Posted on Nov 17, 2013

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Posted on Jan 02, 2017

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SOURCE: knocking noise

Check your tie rods and the drag link bar which controls the steering. Have someone turn the steering wheel back and forth while you are underneath and you should be able to pinpoint the noise location.   I had the same problem on my 2001.  Replaced the lower tie-rod ends and also the ones on both sides of the drag link. This solved the problem.  Whether you do this job yourself or not, you will definately also need an alignment upon completion.  

Posted on Jun 09, 2008

Mikey108
  • 475 Answers

SOURCE: transfer case knocking

These transfer cases do not have plastic pumps. Do have the transfer case looked at by Jeep tech, it could be as simple as an adjustment on the lever.

Posted on Jan 16, 2009

  • 3 Answers

SOURCE: Service 4 wheel drive, service electronic brake warning

This is caused by by a bad ignition switch. According to the dealer the ignition switch contains an antenna that many of the sensors use to communicate with the vehicle, as well as the key fob. When the switch starts going bad the vehicle computer losses communication with these sensors and starts producing codes which include the 4wd and the electronic brakes. My fiance has had the same issues with her Grand Cherokee as well as the key fob not working, the remote start not working, the service engine light comes on, the door chime will sound when the key is NOT in the ignition and the lights are NOT on, as well as numerous codes usually relating to loss of communication with one system or another. All of which are fixed once the ignition switch is replaced. Unfortunately, this usually only fixes the problem for a short time (weeks or maybe a few months) before the piece of junk ignition switch fails again and it all starts over.

Posted on Mar 10, 2009

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