Question about 1999 Dodge Durango

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My engine started knocking after low oil pressure

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These truck's are bad about oil pump's, I would replace the oil pump, and hope for the best, if the knocking goes away, then it's fix, but if you still have the knocking, the only fix is an engine overhaul, or a good used engine.

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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did the oil light come on? it it did that means a low pressure situation which can cause con rod bearing damage. the knock sensor can cause that too.

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No if the oil light has flickered you have oil pressure loss some time just belive the sensor do help us out. lifter do not cause oil pressure loss pressure is built in the rotation of the crankshaft. The knock under the plenum will point you to that cylinder that is affected, (main bearing) as for a 1995 the injectors can only cause a misfire but no knocking noise,will they honor the warranty

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i'm sorry! does the engine dipstick for the oil,is it full? has it been run low on oil lately? is the knocking sound like a real hard knocking,thumping with like deep base sound?if so,do not start it again. you may have a bad crankshaft bearing,or a bad crank,broken crank. if it's a tapping sound,that's different. it could be low oil pressure, just like the lower knocking,it may be bad oil pump.my advice is this, lower knock from oil pan where you drain the oil,do not start! upper,on top of the engine,just change oil 1st add a fram oil filter,if in cold weather recommend 5w30weight oil,in summer,30weight castrol with fram oil filter.is your oil light on? if not,then it'not low on oil,but CHECK your oil on dipstick,just to be sure thank you for choosing fixya.com

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Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

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1 Answer

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how low does the oil pressure drop?? is it below 40?

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