Question about 2001 Jeep Grand Cherokee
I get an intermittent loud metallic knocking from the engine but difficult to determine where from. Stops when in 'park' and sometimes when you take foot off accelerator and may not happen for 5 miles. Sometimesit is more persitent - any ideas? 2001 jeep grand cherokee limited v8 is knocking @ 82,000. Took it to the jeep dealership, dealership said it is a loose or broken rod and that it would cost 4500 to fix. any other solution would greatly appreciated.
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?
Definitely get a second opinion before doing anything else!
Posted on Jan 14, 2009
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Posted on Jan 02, 2017
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