Question about 2001 Jeep Grand Cherokee

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Motor has a knock in the lower part of motor. The knock is there al the time

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There are three items that can cause that noise. first is a connecting rod bearing, second is a main crank bearing, third is a wristpin. All of the above require engine teardown to repair correctly. Rod and main bearing problems will also be accompanied by lower than normal oil pressure but changing the pump will not fix the problem. A wristpin will not lower the oil pressure as it is oiled by "splash" not by a direct oil passage. There is a fourth cause which sounds a lot like a rod or main...that is a cracked flywheel (only on automatic trans vehicles). It takes a good amount of experience to differentiate between those noises so I suggest you have someone who has that tr4aining take a listen.
In most cases, teardown and rebuild is very expensive and either a good scrapyard engine or a remanufactured replacement will give you a better option. The only item I'd even consider replacing is a rod bearing and then, only if it has just begun to make noise and the noise is very slight, otherwise it will fail again.

Posted on Feb 06, 2010

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Hello, sounds like you have bad rod bearing, or rod cap could be wore out, try lucas oil if it does not quiet down then you probably have rod bearing going out, wouldnt drive unless you have too. untill you get checked

Posted on Feb 06, 2010

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when the distributer is turned you are changing the ignition timing .
you say in your text and i quote .

The service tech only adjusted the distributor fas far as he could to lower the idle.

a tech should never be turning the distributer to lower the idle nor should this be explained in any way to the customer.

if a tech says he dosent understand something stop them rightaway and get your car out of there or get someone else to talk to .
10 times out of 10 if the tech dosnet get it the car wont get it either.
have a competent service tech test and conferm the timing belt or chain timing .

keep me posted
joelmitchell1@hotmail.com

thank you
jm

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