Duramax lb7 white smoke and shaking
#1
Duramax lb7 white smoke and shaking
Yesterday I got home and parked my truck in the driveway but before I shut the engine down she was shaking bad and I noticed a large amount of white smoke blasting through the blow-by. I popped the hood and the whole engine was shaking left and right. There is also white smoke blowing out of the exhaust. The smoke is hard to see out of the exhaust but not the blow by. What is the problem?
#9
Join Date: Dec 2010
Location: Fool's Golden State
Posts: 1,190
Likes: 0
Received 113 Likes
on
109 Posts
The white smoke is unburned diesel. It is making it past the piston into the crank case and comming out any holes available. There is a chance, while rare on the LB7, that the piston is cracked. If the injector got stuck in the open position it may have also burned a hole in the piston.
The duramax is not known to get bad rings much, but it has had it's share of injector issues and a few cases of holes getting burned through the pistons from it.
The duramax is not known to get bad rings much, but it has had it's share of injector issues and a few cases of holes getting burned through the pistons from it.
#10
Also, I just experienced a turbo that was pressurizing the crank case ... It was a bear to check but it was real obvious....
Had to make a down tube from oil return, put into small pan with oil in it ... started and sure enough, turbo was makin bubbles, So with tha said ...
It could be multiple issues all leading into one ..... I would start with Compression test and leak down and go from there, no need to go pulling it all apart for an injector if that is the real issue ..
Had to make a down tube from oil return, put into small pan with oil in it ... started and sure enough, turbo was makin bubbles, So with tha said ...
It could be multiple issues all leading into one ..... I would start with Compression test and leak down and go from there, no need to go pulling it all apart for an injector if that is the real issue ..