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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29518
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2004 chev duramax 6.6 smoking out breather after replacing

Customer Question

2004 chev duramax 6.6 smoking out breather after replacing injectors
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.
Hello, I'm Cam.
Can I get your first name please?
sorry to hear about this issue. Can you tell me if your truck is the LB7 or LLY?
Customer: replied 2 years ago.

lb7

Customer: replied 2 years ago.

I think lb7 name is mark

Expert:  GM Tech (Cam) replied 2 years ago.
MArk, Was there fuel in the oil before or after the change? Did you do an oil change after? This may be only an accumulation of fuel in the oil. It is always recommended to change oil following injector replacement on the LB7.
Customer: replied 2 years ago.

yes changed oil I had to because a injector cup pulled out

Expert:  GM Tech (Cam) replied 2 years ago.
OK, Can you give me a sense of how much smoke? What does it smell Like? How long does it go on for or how much have you driven it following the replacement?
Customer: replied 2 years ago.

no smell if you pull the oil cap out it puffs out preety good it start as soon as you start it and I have driven it about 3 miles

Expert:  GM Tech (Cam) replied 2 years ago.
OK, this may just be residue in the system. Lets drive it for a bit and see. You will get a bit of blowby normally.