Kept getting throttle body faults on my 6.7 so I pulled it to clean/inspect. Wow what a filthy lower intake manifold. A combination of black soot and an oily substance mixed together to make a wet sludge. Built up to about 1/8”-1/4” thick.
Truck has about 98k miles on it.
any thoughts on if this is coming from the CCV or the EGR?

 

Here's mine at 90k. I've been told mine is cleaner than most. For whatever it's worth, I think my truck has been on 10W30 Motorcraft oil its entire life, and my idle hours are 1/3rd of my driving hours according to the dash. I still have plans to permanently fix this issue as soon as my truck is near end of warranty. EGR is going bye bye.

 

It is from the EGR and CCV. One way to reduce the build up is to remove the CCV and route the gasses to the rear of the truck, and cap off the opening into the intake. Adding a catch can may or may not help, depends on where the oil is coming from. The other way is to lose some weight, but that comes at a potential $45,000 fine. That round thing in the middle is a cone, the EGR gasses come in behind it. That "throttle" plate is used to block off incoming air so the gasses are sucked in.

 

Not that it applies here, but I wish that I had the pics of the grid heater on my 6.7 Cummins at 55K miles. It was choked almost 75% closed.

 

Did the performance drop at all from the crud?

 

I had all kinds of CEL issues which lead to my having to do the EGR cleaning procedure about 10k miles before the factory recommended 65k miles.

 

Wow, I wonder if that was from low rpm driving...I try to keep my rev's up while city driving, assuming I'm keeping the gases flowing, IDK. Thanks for the share.

 

Just curious (as I'm fast approaching 65K): What steps are performed for the factory recommended EGR cleaning procedure, anyone know? Is it just cleaning the build-up at this spot, or does it also include removing and cleaning the EGR, cooler, etc.?

I'm wondering if it's worth doing it myself, or paying to have it done professionally...

 

I plowed a small amount with that truck...just my and my parent's driveways. Early on I'd sometimes get a DPF at 70% or higher warning. It would clear out on my 10 mile drive to work. I seldom drove locally w/o locking out 5th and 6th...just to keep the rpm at 2000. The truck got worked quite a bit...pulling a 12k toyhauler all over the east coast.

As I mentioned, this was with a 6.7 Cummins that I had the carbon issue...a pre-def, BlueTEC clogged 6.7 Cummins. I don't know that the 6.7 PS has a scheduled EGR cleaning requirement.

 

You can remove the throttle plate assembly (four bolts) that the cold air pipe goes into and clean that out carefully, and on the intake side, use a shop vac and scraper and get what you can. As far as the egr cooler service goes.... I will wait until mine indicates a service needed.

 

Ah, must've overlooked that, thanks.