Question about 1999 Jeep Grand Cherokee

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'99 jeep grand cherokee v6 loose rod in engine

My engine is knocking loud and i believe ther is a losse rod in the engine

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Likely you need more than one (not rod, but rod bearings) In most cases you get knocking noise and low oil pressure as symptoms. If caught early you can do this in-car otherwise engine needs crankshaft and all bearings as well as new pump and system flush.

Posted on Jun 20, 2009

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You need a trained technician to listen to this, but it sounds like a connecting rod and or a crankshaft main bearing noise. I lean more towards the rod knock form a worn out bearing.

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If you have a connecting rod problem, likely it is not the rod itself that has failed, rather, the crankshaft bearing on that rod or the wristpin. Usually though when either has failed, the knocking is an all the time thing, varying with engine rpm. A good tech can usually tell the difference between the two just by listening. A beraing failure is generally also accompanied by a drop in engine oil pressure as well. not so for a wristpin. An intermittent noise (tapping) can also indicate a valve lifter problem... though a lifter can also make noise during a low oil pressure situation. Lifter noise is heard from the top of the engine, both other noises are from underneath.
I would first have a different shop give you a second opinion. If it turns out to be a rod bearing, generally this damages the crankshaft and also sends bearing material throughout the entire engine. To properly repair would require complete teardown and rebuild, or replacement of engine. This does not hold true for lifter or wristpin problems, unless severe, though either can be expensive, even if you do the job yourself..
How long is your powertrain warranty?
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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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