Blue smoke when I back off the throttle

Swanny307 · Apr 24, 2016

I've noticed the last few times getting in my truck when it's cold, oil temp and coolant temp around 50 to 60 degrees. But when I take off from a stop get up to speed then let off the throttle the truck starts smoking. Bluish smoke not really sure what it is, was gonna change the tuning but figured I'd ask on here first. It's a 2013 been de*eted for almost 50,000 miles running GH tuning any info would be great thanks.

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Sterling6.7 · Apr 24, 2016

Sounds pretty normal when the truck is not warmed up. I experience the same thing.

dsmracing1 · Apr 24, 2016

That's raw unburnt fuel my friend.... Normal when the truck is cold.

jetskier · Apr 27, 2016

Mine did the same thing. The second you tap the throttle, it goes away. It seems bizarre that barely touching the throttle fixes it because the temps just don't magically jump.

Notneb · Apr 27, 2016

Youtube heavy equipment cold start, or big cam 400 cold start. You'll feel better

sootie · Apr 28, 2016

jetskier said:
Mine did the same thing. The second you tap the throttle, it goes away. It seems bizarre that barely touching the throttle fixes it because the temps just don't magically jump.

in cylinder temps DO dramatically jump when you blip the throttle. The smoke you are seeing is poor atomization of the fuel with low cylinder temps. the instant the rpm goes up, there is enough heat to atomise the fuel perfectly.

Swanny307 · May 10, 2016

Smoke like this? https://vimeo.com/166147502

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Swanny307 · May 10, 2016

I replaced the turbo with a tow max from Midwest think maybe the stock turbo seals were bad and pushing oil by. But even with the new turbo ok I still get the same smoke when engine temp is cold. The truck has been de*eted for 50,000 miles and it's never done it before.

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