knocking
Senior Member
Joined: Jun 2003
Posts: 302
Likes: 1
From: Salem, OR
08 Lexus GS350 AWD. 08 Lexus RX350 AWD - wife's. 94 MBZ E320 - still have it.
There could be a hundred things. How do you define "knocking"? If you never adjusted the valve clerances it could be them. Fairly easy to adjust. The knocking sound is caused by normal wear of the camshaft and rockers. The later models had hydraulic lifters, no adjustment needed.
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,005
Likes: 32
From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
AS the previous poster said, many reasons. But this car has hydraulic lifters, no adjustment required. You experience the konockin gonly when the engine is cold, and than it goes away? Try 2-3 fill-ups with highest grade gasoline. It may be the cure. It can also be that one (or more) of the hydraulic lifters is worn out. It is not a threat to the engine, but an anoying noise.
