Is it common for a loose flex plate bolts to sound like a rod or bad piston 4.0 1999 WJ?


Asked by Aug 11, 2017 at 07:58 PM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: General

noise is loudest at the bellhousing

3 Answers


Actually it sounds worse cause it's not muffled buy the engine block. Seen way too many of these and usually it's too late to save the flex plate, it's already egg shaped the holes.

2 of 2 people found this helpful.

Similarly, a cracked flywheel will offer some "great noises" like a rod, ect. Would surely check the bolts first. GL!


Well I checked torque converter bolts for loosemess and they were fine no sighns of cracked flex plate what so ever I'm gonna pop off the valve cover as I had it running and drove it up on ramps the knocking noise even under a load could hardley hear it and the longer I had it running the quitter it got that doesn't sound like a rod or main or piston !! sounds more like a calapsed lifter hangin up on number 6 cylinder as when it was the noisiest it seemed to have a miss or stumble in of valve not opening or closing .. The rest of my jeep is in such good shape no rust dents a few very small scratches suspension tires ,differentials you name it I replaced everything in the last 2 years and used it for something to do rather then sit and watch tv eatin pizza,s as I haveother vehicles for work and such so I think next weekend I,m gonna pull the motor and take it to the machine shop . Thank you all for the help and responses and I,ll let ya all know what the mystery knock ended up being!! So I'm gonna Keep on wrenchin

1 of 1 people found this helpful.

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