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.
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
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.