There is an knocking noise in the engine at start up and accelreation.I took it in for an oil change andthe mechanic said there was no oil in it. Neither the check engine light or the oil pressure lights are on or have come on at any point.The noise went away after oil was added but came back a day later.
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Re: knocking noise in the engine.
Have you check the level of the oil... if it is down you are either dumping it on the ground (major oil leak) or it's burning oil quickly... i suspect if you ran it without oil the damage is done... either buy some stp oil conditioner (thickens the oil) or start using 50 weight oil.... all that will do is keep it quiet mostly.
one thing tho... don't try these solutions if you live in a cold weather climate... the oil will get so thick because of the cold you will have trouble turning it over.
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How many miles on engine? Was oil changed after it ran hot? Install a good mechanical oil pressure gauge to see what is really going on. Also might use length of hose put one end in ear and listen with other end to locate exactly where noise is coming from. BE CAREFUL NOT TO STICK HOSE INTO SPINNING PARTS. If noise is from bottom of engine bearings may be shot. However, it could be mechanic left some part loose and that would be an easy fix.
take it to an accredited service shop that has experience on your make of engine and have a proper diagnosis done and quote
it is possible that there is a spinning main bearing and the test is a oil pressure test using a mechanical gauge
some times it spins , low oil pressure -knocking other times it stops and the oil pressure goes back up , knocking stops
should I be correct , normally it can be repaired in car by removing the sump and replacing that bearing shell, of the shaft is not damaged
i would steer away from a new engine or suggestions of a blown engine but it could be serious
Get a mechanics' stethoscope and see if you can find the source of the noise. If it is loudest when the scope end is on the oil pan, you have a rod bearing problem - which means that you need a new engine.
Check the oil pressure manually with a gauge. Make sure you have oil pressure. Perhaps you need a new oil pump, or new lifters. Get a professional opinion from a non interested party. Save money, get a diagnosis.
About the only thing you can try is to change the oil and filter to eliminate gasoline contaminated oil. Try starting it up and if the same noise persists, have a mechanic put a gauge on the oil sensor port to measure oil pressure with a analog gauge. Excess bearing clearance will result in noise and allow oil to bleed down from the bearing caps. There are a few additives which are suppose to coat the engine parts and the coating is suppose to stay on overnight to prevent "dry" starts. So if the oil pressure is low, the oil pump may be weak, but if the oil port tests normal, bearing clearance is excessive somewhere and the engine must be disassembled to find the worn part.
Hi Janay, It would not take a good mechanic more than lifting the hood and listening to the engine to determine that the engine had knocked. By all means have someone else have a listen and a look and wait to hear the diagnosis they give. It's always a good idea to have a vehicle serviced on a regular basis. If you needed to add oil, to have the sound of the engine change, It sounds like you didn't bother? If the engine knocks more when you apply gas it seems to me that the connecting rod bearings and the small end bearing have both been damaged by the lack of lubricant (Engine oil). If you like the vehicle replace the engine, if not replace the vehicle. Regards John
That very well could be-- if you lose oil pressure, this can ruin your engine. You should have seen a red "oil light" indicating that there was a serious problem, to accompany the knocking noise, which could be "rod knock" if you had very low (or no) oil pressure. Make sure you have someone else verify before giving this guy thousands of dollars.
best advice here is to ask a local mechanic to have a look as engine shouldnt have started knocking with teh new oil in unless someone has put tranny fluid into teh engine or something stupid ,the lights for the airbag shouldnt be connected but the oil light ?? Do not drive car untill a mechanic has come around and checked it out for you though as this oil light coming on and knocking noise is serious