Cm871 hammering, poor thing

[marek4792]

(10-07-2020 )Signature620 Wrote:  Horrible knocking sound only at 1500rpm is nearly always the damper. Have a feel around the back of it on the intake side. That rear face should be flat - If it's bulging then the silicon/gel inside has gone hard.

Once you get Insite, get someone to check your ECM code is right for your engine aswell.

Definitely is the damper, my 870 was making the same noise at the same rpm range before the damper catastrophically came apart..
EDIT:
I posted pictures of mine in this thread awhile back.
http://rawze.com/forums/showthread.php?t...per#pid445