Question about 1993 Jeep Grand Cherokee

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Extreme vibratin @ 1700-2300 rpm

I just put a used 4.0 6cyl enging in my 1993 jeep grand cheroke. I am haveing extreme vibrations throughout the truck at 1700-2300 rpm,s It happens to a leesor exten when in park and revving the engine to that rpm. It almost seems like there is a balance issue. Some of the things i have been thinking are the flexplate/flywheel on the used engine was a bit smaller than on the engine i took out. The new engine was from a 1992 Jeep Cheroke and seemed to run fine in that truck. So took the flywheel from the existing engine and used it. The engine seems to run good and when below or above that rpm it is like silk.

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  • timh784 Jan 07, 2009

    I replaced the drivers side motor mount when i replaced the engine the rubber on the old one was torn completly and was worn like it had been that way for a while. I got this truck from a friend who has been driving it for years and has not been offroading or gotton into an accident. I looked at the passanger side mount and its looks ok should i change it just incase? How could i tell if its a frame issue?

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Hi a friend of mine was having the same problem, sounded like major tranny problem, turned out to be a tranny sensor, good luck

Posted on Jan 08, 2009

  • The Dude 66 Jan 09, 2009

    This was the shift sensor, it was hard to find vibration, but that was the cause.

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One of your motor mounts is touching metal to metal, either the rubber is cracked or broken, or crooked and frameing out

Posted on Jan 07, 2009

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