Question about 2000 Jeep Grand Cherokee

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Knocking noise when accelerating!! It's loudest when I first start my Jeep grande Cherokee leredo (2000) but then only happens when I step on the gas. Any ideas of what this could be. I do need my transmision drained.. could this be it? Just had the front tire rod replaced.. can't be this. Help!

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Knocking noise is generally from the engine. What is your oil pressure? If pressure is low and oil is reasonably full, refrain from driving it till the cause is determined. Noise can also come from the transmission or transfer case but more likely it's from the engine.It can come from sticking valve lifters (moderately bad to potentially serious) connecting rod or main crank bearings (always serious) or piston slap (annoying, expensive but not terribly serious unless very bad) Piston wristpins can also knock but are very rare in todays pistons. Either way, this is not an item to ignore.

Posted on Jun 03, 2009

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Its a bad rod bearing. I worked at a jeep dealer for a few years and its common. Not that jeep will say there is a problem. However I wil tell you that the engine can last a day or a year makin that noise mine did it for 4 years lol. I put lucas engine oil treatment in it too....Seemed to help. Also know someone who used castrol oil but a thin grade like 5w20. the thinner oil is able to get between the beaing and the rod better thus quiting the noise...

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