Question about 2004 Subaru Impreza

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Oil light came on then loud noise sounded like a belt or pully but not sure could it be the engine parts like piston or valve?

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Oh man... I sure hope not...
Is there a big oil spot under the car now?
It could very well have been the engines piston rod going thru the block that caused the loud noise ... and the oil pressure to drop to zero at the same time...

Posted on Sep 30, 2010

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Posted on Jan 02, 2017

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If a knocking noise, piston or crankshaft related problem.

Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Regards,

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Take a look at the belt see if it has cracks or worn grooves.. if it dose have it replaced. if it doesn't pull on the belt back and forth see if the tension pully is giving the belt tension( it supposed to be about 1/2 of an inche to an inch or try to turn the belt around to almost half way) if not replace the tensioner pully. if good check the free pully by starting the car and spary a bit of wd40 on the center of the pully if noise disappers replace the free pully. if not see ur local auto shop..

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