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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29522
Experience:  GM Grand Master Technician 2007. 14 years experience.
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06 duramax suddenly tons of smoke while driving down hwy

Customer Question

06 duramax suddenly tons of white smoke while driving down hwy checked balance rates found #6 was at 7.6 and #1 was -4.0 and never moved while in gear so I replaced both injectors now I have light white smoke and still a fuel knock but all balance rates are good. No codes and rail pressure is hood
Submitted: 1 year ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 1 year ago.

Hi there, I am Cam. Can I get your first name please? Just to confirm first, #6 is third back drivers side and #1 is front passengers side, second, does your scanner allow you to disable the injectors one at a time? I think you still have a bad injector but a fuel knock and smoke won't show with the balancing rates, to diagnose that you disable with a scanner one at a time and see which makes it stop. Then you replace that one. Unplugging is not an option. If you unplug an injector, it disables the group of 4 and causes many other codes.

Customer: replied 1 year ago.
You are right on the cylinders I replaced and no my scanner will not allow me to shut any off only see balance rates. The truck does not smoke at idle only on a pull above 2500 rpm not sure this will show that way
Customer: replied 1 year ago.
Oh it's Jay
Expert:  GM Tech (Cam) replied 1 year ago.

Ok Jay. Does it show balancing rates at 2500 rpm?

Customer: replied 1 year ago.
Expert:  GM Tech (Cam) replied 1 year ago.

Ok, I hate to say it but the next option is to get our hands on a scanner that will allow us to disable injectors one at a time. That way we can narrow down the injector.

Customer: replied 1 year ago.
Would efi live do it
Expert:  GM Tech (Cam) replied 1 year ago.

I have not used EFI live so I cannot say for sure.

Customer: replied 1 year ago.
I appreciate your help keeping me in the right direction
Expert:  GM Tech (Cam) replied 1 year ago.

My pleasure. We will get this sorted out for you.