Chevy and GMC Duramax Diesel Forum banner
1 - 1 of 4 Posts

· Registered
2021 LM2 SLT
Joined
·
75 Posts
I have an 04 LB7 and just last month I heard sort of a knocking sound that became loader after a week. Worried, I removed the serp belt and listened. The knock disappeared. Now I knew the knock was not internal. Turned out to be the vacuum pump. (covered by warrentee)
 
1 - 1 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top