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View Full Version : LB7 smoke/haze at stoplights and idle


Hawker
09-18-2011, 08:53 PM
I was thinking it was my EGR giving me problems, but at this point im not sure. I've noticed after sitting at a stoplight for a while and then getting on it, the truck smokes, either white or blue-ish smoke/haze. As the truck is now, it has a CAT delete, 4" turbo back and PPE economy tune.

I ran GM's special sauce in a gallon of fuel to clean out the injectors just in case that was an issue, to no avail.

maine04max
09-20-2011, 04:47 AM
Do you have a scan tool so you can run some diagnostics ?
mine did something like this and turned out i had 2 bad injectors

CT SMOKER
09-20-2011, 10:04 AM
if u have a scan tool command the egr to open and close to c if its working right. U can do the same for the variable veins in turbo and injectors. I can do it on AE if u want to swing in sometime

maine04max
09-20-2011, 08:14 PM
if u have a scan tool command the egr to open and close to c if its working right. U can do the same for the variable veins in turbo and injectors. I can do it on AE if u want to swing in sometime

Lb7's dont have VVt turbos

Hawker
09-20-2011, 10:20 PM
if u have a scan tool command the egr to open and close to c if its working right. U can do the same for the variable veins in turbo and injectors. I can do it on AE if u want to swing in sometime

I have to do the tie rod ends and get it back on the road. maybe some time i'll swing out there to run AE. you there in the mornings?

CT SMOKER
09-22-2011, 10:39 AM
my home away from home, ya let me know i can open up for u anytime. My wife got pissed when i said i was gonna get a camper to park next to shop haha !!!

CT SMOKER
09-22-2011, 10:41 AM
Lb7's dont have VVt turbos

Thanks was just saying i can run a few test on AE. Thanks for the info tho

doubled
09-22-2011, 08:08 PM
Sounds like injectors. When my egr went it would lag and blow black smoke til it got up to 2000 rpm. shut it off with efi and all is good.