6.7 Surging during regen

Reply Subscribe

Thread Tools

Search this Thread

Dec 26, 2023 | 03:00 PM

Jmcx1969

Thread Starter

Cross-Country

Joined: Jan 2023

Posts: 62

Likes: 22

6.7 Surging during regen

I have a completely stock 2017 F350 that is approaching 300k miles and has developed an issue. During regen the engine power surges rapidly. If above 70mph you hardly notice but at lower speeds it is very apparent. To the point of almost bucking/stalling. The boost gauge even bounces up and down. If l apply more throttle the surge goes away. So l think it is not a fuel supply problem. ie dirty filters. They are new, actually.

There are no check engine lights and it runs normally when not in regen. I do have Forscan so can monitor things. Has anyone experienced this or have any insight? The truck has been almost flawless to this point.

Dec 27, 2023 | 03:59 PM

senix

Super Moderator

Joined: Aug 2008

Posts: 37,383

Likes: 1,867

From: Frederick, MD

might need a programming update. Have it in for service lately?

Dec 27, 2023 | 08:20 PM

craftsmangary

More Turbo

Joined: Jun 2009

Posts: 580

Likes: 58

From: Michigan

I'm a little surprised that the money light isn't on, scan it and see if it has any codes. If something is wrong should have a code..

Dec 29, 2023 | 10:59 AM

Jmcx1969

Thread Starter

Cross-Country

Joined: Jan 2023

Posts: 62

Likes: 22

Quote:

Originally Posted by senix

might need a programming update. Have it in for service lately?

It has never been back to the dealer.

Quote:

Originally Posted by craftsmangary

I'm a little surprised that the money light isn't on, scan it and see if it has any codes. If something is wrong should have a code..

No codes. Yet..

Dec 29, 2023 | 11:54 PM

JoeUser

Fleet Mechanic

Joined: Oct 2022

Posts: 1,822

Likes: 898

From: Dallas Metroplex

If it were mine, I'd do the basics and check the MAP sensor to make sure it isn't clogged, and the EGR for the same (just to rule out anything obvious). If it's been some time since the MAP sensor was cleaned (or replaced, with 300K on the dial) they can cause some weird behavior on the intake side with the turbo from what I've read (but haven't ever experienced myself). If the EGR is constricted that could effect the regen cycle on the exhaust side of the equation, perhaps.

Just a WAG, but I've seen pictures of both being completely clogged with much fewer miles than your 300K.

Dec 30, 2023 | 10:40 AM

Painted Horse

Lead Driver

Joined: Nov 2005

Posts: 5,231

Likes: 4,247

From: Kaysville Utah

300 K and never back to the dealer. With full emission no less. I'm impressed.

Jan 21, 2024 | 02:31 PM

Jmcx1969

Thread Starter

Cross-Country

Joined: Jan 2023

Posts: 62

Likes: 22

I cleaned the throttle valve upstream of the EGR injection point and carefully chipped out some of the carbon downstream. The problem seems to be gone.