I have just got my car back from the local mechanic trying to fix a knocking noise in the engine. It only happens when I am going 30-40km/h and accelerating uphill. It sounds like a tap tap tap noise. He curses Subaru's and cannot work it out. This is not a turbo but a 2.2 brighten.
He seems to think it was a loose spark plug so he replaced them all. But it still knocks. That might have been another problem, it used to drop a cycinder some times
Do you have any idea so I can tell my mechanic where to look?
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Re: Knocking in the engine
The light ticking sound tells me it's with the vavle train. Could be a number of things. Something simple as not enough oil getting to valves or harder like worn valve springs or low oil pressure. If you haven't been hot roddin your car, odds are it's just not getting enough oil. Do you have an oil pressure gauge in your vechile? If so, what dose it read at idle?
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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.
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.
Has the engine been run low on oil? Does the knocking get louder as the engine warms up? Have you had a automotive technician listen to this noise? Pistons don't really knock, the bearings in the engine called the crankshaft and piston connecting rod bearings do make a loud knocking noise, if that is the case the engine must be removed from the car and rebuilt.
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
Internal engine knocking usually means very expensive repairs to the crankshaft, bearings, pistons, and connecting rods. External knocking can be loose pulleys, loose flex plate (at transmission end). Best to see an experienced mechanic who can give you a better idea of the noise and how to fix it. If the engine requires major work inside, it might be advantageous to exchange the engine with one from a wrecking yard. Good luck!