Knocking under valve cover?

Asked by Shaneco75 Jan 19, 2021 at 10:40 AM about the 2003 Chevrolet Cavalier Coupe FWD

Question type: Maintenance & Repair

Hydraulic lifter ticking thinking about flushing
oil then drain and replace filter oil and add
treatment hopefully stop the noise in my 2003
cavalier. I already replaced tensions on timing
chain so that is not reason for noise. Trying to
avoid having to reply lifters. Any advice would
be helpful

2 Answers


An oil change is cheap, so see if that helps. I personally would not spend hundreds to thousands rebuilding your engine. Start looking for a replacement.

Going to try oill flush change and treatment today will keep you posted , for the 2 people watching

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