Smoking problems
Thread Starter
Intermediate
Joined: Sep 2012
Posts: 37
Likes: 0
Smoking problems
I have a c5 with a 408 and twin turbos. Driving around it's fine just smokes a little when u take off sometimes. But under boost it smokes pretty good. Then continues to smoke a lil after boost. I did a compression test. 121-130 across the board I'm at 8.5:1 so 124 would be ideal "according to a chart" . I'm wondering could it be valves. I just wanna make sure before I tow it 10 1/2 hours. Any help would be great.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Make sure that your intercooler isnt full of oil. Most have a water/oil drain on the bottom of the lower part of the cooler.
I had a volvo that had half a quart of oil in the intercooler and it did the same thing. Smoked under full boost but no other time
Do you have a vented PCV system?
If you have oil in the intercooler, check the turbos for an oil seal leak. You will see more oil in the outlet pipe on the turbo that leaks oil
BC
I had a volvo that had half a quart of oil in the intercooler and it did the same thing. Smoked under full boost but no other time
Do you have a vented PCV system?
If you have oil in the intercooler, check the turbos for an oil seal leak. You will see more oil in the outlet pipe on the turbo that leaks oil
BC
Instructor
Joined: Jan 2011
Posts: 176
Likes: 1
From: Buffalo Grove Illinois
If you are getting smoke during boost it could be a) bad turbo b) problem with oil return to the engine. That could be scavenge pump issue or line issue. Are turbos front mount or rear mount?
