2001 Chevy Impala Ocassional Engine knock

2001 CHEVROLET IMPALA
110,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
ROADBOY100
  • MEMBER
  • 1 POST
My mother's car has 3 or 4 times in past year began knocking heavily when started. It will knock the entire time it is running until turned off. Then it may not knock again for a period. Twice she had engine crankcase flushed, new filter and oil installed. No problem for a period then reoccurs. She drives only couple 4-5 times per week and only short distances. talked to local mechanic who only thought is maybe trash or sludge being picked up in crankcase screen, requiring removal of oil pan. Any thoughts?
Mar 9, 2010 at 10:44 AM
Advertisement
Avatar
DOCFIXIT
  • ✓ASE Certified Mechanic
  • 18,828 POSTS
  • ASE Certified Mechanic
Maybe carbon deposits causing detonation which sounds like a knocking. A product called Sea Foam is a good cleaner.
Mar 9, 2010 at 10:49 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.