Is this normal?
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Mountain Pass
Joined: Jul 2018
Posts: 105
Likes: 2
Is this normal?
My truck started blowing black smoke a few months ago but only at low rpm's. Cruising and going to pass someone or starting from a stop to hard. Those kind of things. It clears up when it gets above 2-2200rpms or when it down shifts or the converter locks up. Seems to run normal and no other signs of an issue. The truck is deleted and proven tuned with a single 50hp clean tune. New cold side pipe, new fuel filters, new map sensor and cac and intake sensor cleaned. I talked to proven they said it's no way the tune and to go through the air and fuel on the truck. Everything seems fine no boost leaks I can find and everything is very clean. Last night I found this and I was curious if this is normal?
Fleet Mechanic
Joined: May 2018
Posts: 1,765
Likes: 502
The oil at the opening of the turbo is likely due to the crank case vent routing back to the intake. That wouldn't cause the black smoke though. I would imagine that's due to the tune being over fueled. Does it smoke on a lower powered tune?
Hotshot
Joined: Jul 2013
Posts: 14,298
Likes: 2,197
as oil gets fuel diluted and level rises….
the excess oil gets sucked into the intake via the CCV
there are different levels of concern for oil break down depending if you started with 5W?, 10W?, or 15W?
also miles on the oil is a concern since more thining will occur.
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Mountain Pass
Joined: Jul 2018
Posts: 105
Likes: 2
So this is ok? Any ideas what could be making me dump black smoke at low rpm's? I also lost about half a mpg and it builds up down below 2200 or so rpm and it will smoke pretty thick black until it takes off or about 2-4 seconds. Would the ccv possibly need replacement? The truck only has 40k miles.
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Cargo Master
Joined: Oct 2019
Posts: 2,851
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From: Southeast MO
Soooo did this start with the delete/tune or have you been running it no issue and this just started?
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Cargo Master
Joined: Oct 2019
Posts: 2,851
Likes: 1,197
From: Southeast MO
the oil is a by product of the self leveling oil system
as oil gets fuel diluted and level rises….
the excess oil gets sucked into the intake via the CCV
there are different levels of concern for oil break down depending if you started with 5W?, 10W?, or 15W?
also miles on the oil is a concern since more thining will occur.
as oil gets fuel diluted and level rises….
the excess oil gets sucked into the intake via the CCV
there are different levels of concern for oil break down depending if you started with 5W?, 10W?, or 15W?
also miles on the oil is a concern since more thining will occur.
Lead Driver
Joined: Feb 2022
Posts: 7,975
Likes: 4,055
Reload your tune. If it happened after towing, it is possible some tables got screwed up and it is over fueling now based on prior load. If that doesn't resolve it, then check the fuel system next as you are dumping too much fuel which is either from the tune, or from leaking injectors.
Lead Driver
Joined: Feb 2022
Posts: 7,975
Likes: 4,055
If it still smokes after that, then you need to hook a computer up to it to read the injector dwells and pressures. Might be able to do it with Forscan, if not, you will need to take it to a shop that can.