Clanking sound from engine


#1

I have a 2001 black Camaro Z28 (automatic) that I don’t drive very much (42,000 miles) and it’s in pretty good shape. I have no problems driving it when it’s cold, but as far back as I can remember when its warm (after driving for about 30 minutes) the car seems to have 1/2 its power when going from 30 to 40 mph. When I floor the accelerator at this point, I hear a loud “clanking” from the engine. After passing 45 mph, it seems fine. Any ideas what’s going on?


#2

The “clanking” may be engine knock (ping). It might be fuel octane too low, carbon build up in the cylinders, timing too high (advanced).