# 2012 Ford F-250 carbon buildup questions

**URL:** <https://community.cartalk.com/t/2012-ford-f-250-carbon-buildup-questions/160078>\
**Category:** Maintenance/Repairs\
**Tags:** super-duty-f-250-srw, ford\
**Created:** [March 1, 2020, 8:54pm UTC](https://community.cartalk.com/t/2012-ford-f-250-carbon-buildup-questions/160078 "2020-03-01T20:54:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![RandeFarrow](https://avatars.discourse-cdn.com/v4/letter/r/2acd7d/32.png) [@RandeFarrow](https://community.cartalk.com/u/RandeFarrow)\
**Post date:** [March 1, 2020, 8:54pm UTC](https://community.cartalk.com/t/2012-ford-f-250-carbon-buildup-questions/160078/1 "2020-03-01T20:54:32Z")

</div>

I own a 2012 Ford F-250 with the 6.7 liter Powerstroke Turbo Diesel with 152,000 miles. I bought the truck when new and it has not been modified in any way. Factory original. I recently changed the vacuum line to the turbo due to a buzzing noise on the engine after shutting the key off. The service manager at my Ford dealer produced a service bulletin on the noise back in 2013. To change the vacuum line you must remove the throttle body. What I discovered on my truck was a significant accumulation of soft black carbon immediately downstream of the throttle body for about two inches in length. The engine has never used any oil. So I have numerous questions. Where did the carbon come from? Do I have a problem that I need to address? Is this a harmful development on this engine or is it “normal”? Should I clean this out more frequently? The truck has always run very well, produces great fuel mileage and continues to perform as good as new. When I asked the service manager about this, he would not make any comments on the condition. Has anyone got any information on how to deal with the soft carbon buildup problem?

---

<div class="post-metadata">

**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [March 3, 2020, 7:49pm UTC](https://community.cartalk.com/t/2012-ford-f-250-carbon-buildup-questions/160078/2 "2020-03-03T19:49:30Z")

</div>

the carbon is from the EGR valve and the PCV valve.

A can of Seafoam top engine cleaner will get rid of the carbon.

> **[Sea Foam | Makers of Sea Foam Motor Treatment & Other Engine Products](https://seafoamsales.com/)**
>
> Sea Foam makes the awesome Sea Foam Motor Treatment and other quality Sea Foam products for all types of gas and diesel engines! Trusted since 1942.

Tester