what is carbon knock???

Reply Subscribe

Thread Tools

Search this Thread

Apr 12, 2005 | 10:02 PM

#21

GoldenVelvet

TECH Junkie

Joined: Jan 2003

Posts: 3,427

Likes: 0

From: Fresno/Chico

Quote:

Originally Posted by GirlsDoItRight

ya, I pm'ed you yesterday after i put it on. I took a before and after shot.. it looks pretty close to the same.. but i could tell the second i took the truck off the jack stands that it was lower... thanks again.

I thought that PM was sent befor the install

Hint <---

Apr 12, 2005 | 10:06 PM

#22

SSlow 4.8

TECH Junkie

iTrader: (4)

Joined: Mar 2005

Posts: 3,394

Likes: 1

From: Flowery Branch, GA

hint taken...
wheres the bad sellers list tho? jk... i left ya good feed back.

Jan 22, 2018 | 12:50 PM

#23

noazhouse

Registered User

Joined: Jan 2018

Posts: 1

Likes: 0

GM L9 6.2 motor 45,000 miles on it

Gm is is telling me the knock noise??? is caused from the build up of carbon on the pistons and should go away after 90 seconds mine last like 5 min and then again after start up again is this normal on a motor that only has 45,000 miles on it with only premium fuel and all required scheduled maintenance

Noah

Jan 22, 2018 | 07:19 PM

#24

turboal1

TECH Enthusiast

Joined: Nov 2010

Posts: 672

Likes: 11

Carbon

sounds funky to me, get hold of a bore
camera, Harbor Fright. pull the plugs and
look down in the bore at the piston top.
GM top engine cleaner is good stuff.
I have 47K + on my 6.2, quiet as a mouse.