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Question: Jeep grand cherokee knocking what could it be?

(Posted by: erwinscotty on 2010-03-08 00:36:57)

I have a jeep grand cherokee that is making a knocking noise v8 1997, it sounds like it is coming form the passenger side when i have the jeep in park it is almost not noticable until the engine has ran for a while when i get in and hold my foot on the brake and put it in gear it is real loud. put it back in gear and i cant hear it until i get out and walk aroung to the passenger side of the jeep and listen real close and i can hear it real low . the jeep has also been reving up and down but never dies , , if i drive down the highway i dont hear the knock or it is so light i cant hear it . i dont know how long it has been doing this because i had a knocking sound coming form my evap solenoid and it sounded just exactly like the knock coming form the engine i changed the evap solenoid and a few days later is when i heard the engine knocking noise and i thought the evap was knocking again .but it was the engine sound form the passenger side any body have any ideas thank you one more thing when i put it in park and rev the motor up standing in front of the jeep i dont here a knock and the motor sounds good cant figure it out if any one has an idea i would appriciate it thank you

Posted by: joy ride on 2010-03-08, 00:40:57

Take your Jeep to your local muffler shop and have them check to see if the exhaust system has a broken weld...I would recommend to trying two different shops just to make sure there not taking advantage of you. Sounds like a loose hinge in the exhaust maybe even a catalytic converter that went bad. Make sure you watch them when they check it though. Good Luck

Posted by: Melody_is_my_world on 2010-03-08, 00:44:44

Could be your knock sensor. HAH JK! i think i am SO funny :) on a serious and depressing note, sounds like a push rod, means your motor is toast. honestly it could be multiple things and i really wish it was soemthing else. every time this happens to me or anybody i know it is a push rod problem or the piston is hitting against the cylinder which is usually the result of the rocker arm pushing it from a funny angle which is usually the result of a timing belt issue. well, timing belt or that other thing that is used in place of a timing belt, gahh i cant remember what its called though... anyway, i hope i am wrong so get a mechanic to check it out.