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Old 10-24-2004, 08:15 PM   #10
Scooby Specialist
Member#: 32846
Join Date: Feb 2003
Chapter/Region: MAIC
Location: Elkton, VA
1998 Impreza L-SOLD
Arcadia Green


I had my oil changed at Jiffy Lube and they put a bit too much.
How much extra? And I take it that it didn't knock before you had the oil changed?

Do you have a CEL?

You could have incorrect valve clearance, worn valve rocker, worn cam, or broken valve spring. However, it sounds like something a little deeper in the block. You said you have a stethoscope, so, locate which cylinder(s) is/are noisy.

Disconnect the fuel injector connector of the noisy cylinder and see if the sound dissipates. If it does, it’s possible you have a worn crank main bearing or worn bearing at crankshaft end of connecting rod. If it doesn’t, it could possibly be a worn valve lifter, cam gear, or worn cam journal bore in the crankcase.

Have you ruled out the knock sensor, bad gas?

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