Turbo surging
Tuned
Joined: Oct 2007
Posts: 285
Likes: 4
From: Jackson,WY
4800 miles on my 15 and not one bit if surge, which is good.
Logistics Pro
Joined: Jul 2002
Posts: 4,821
Likes: 19
From: South Dakota
I think I still have the shop ticket in my truck. I try to find it this afternoon.
Logistics Pro
Joined: Jul 2002
Posts: 4,821
Likes: 19
From: South Dakota
I think the surging on the 11-14 is the dual compressor side if the turbo. I think the ECM gets confused between the VGT on the exhaust side and then the intake side opening/ diverting air around, then the surge starts. Just my thinking on that.
4800 miles on my 15 and not one bit if surge, which is good.
4800 miles on my 15 and not one bit if surge, which is good.
Logistics Pro
Joined: Jul 2002
Posts: 4,821
Likes: 19
From: South Dakota
To be clear, this issue is not easily resolved by just pulling into a dealership.
There usually aren't any codes with this issue. A tech has to test drive the truck and replicate the issue, which is not easy. If they get it to replicate, they they should be looking at the vgt signal for oscillation as a starting point.
There usually aren't any codes with this issue. A tech has to test drive the truck and replicate the issue, which is not easy. If they get it to replicate, they they should be looking at the vgt signal for oscillation as a starting point.
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
It's just over compensating to try to hold a power level. Like a bad governor....
Needs power, spools up, gets going a hair too fast, spools down, slows down a tick too slow, bounces back up. Mine has always done this while in regen for some reason, only with an unloaded truck.
It just can't find a neutral power level at that speed without any external load like a trailer.
Makes sense that the fix would be an adjustment to whatever governs the turbo boost, or, by adding resistance to the system so it has something to drag on and stabilize.
Needs power, spools up, gets going a hair too fast, spools down, slows down a tick too slow, bounces back up. Mine has always done this while in regen for some reason, only with an unloaded truck.
It just can't find a neutral power level at that speed without any external load like a trailer.
Makes sense that the fix would be an adjustment to whatever governs the turbo boost, or, by adding resistance to the system so it has something to drag on and stabilize.
Lead Driver
Joined: Jan 2010
Posts: 6,600
Likes: 84
Mine only does this under a regeneration as well but not all of the time which makes it interesting as to why this happens.
The conditions are usually under 60 MPH and with cruise control in command.
I can watch the boost gauge move and the CTS reports it.
It's more noticeable some days than others. Sometimes I see it happening but I don't feel anything.
The conditions are usually under 60 MPH and with cruise control in command.
I can watch the boost gauge move and the CTS reports it.
It's more noticeable some days than others. Sometimes I see it happening but I don't feel anything.
Logistics Pro
Joined: Jul 2002
Posts: 4,821
Likes: 19
From: South Dakota
Mine only does this under a regeneration as well but not all of the time which makes it interesting as to why this happens.
The conditions are usually under 60 MPH and with cruise control in command.
I can watch the boost gauge move and the CTS reports it.
It's more noticeable some days than others. Sometimes I see it happening but I don't feel anything.
The conditions are usually under 60 MPH and with cruise control in command.
I can watch the boost gauge move and the CTS reports it.
It's more noticeable some days than others. Sometimes I see it happening but I don't feel anything.
My truck was in and out of the shop since march of this year.
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Logistics Pro
Joined: Jul 2002
Posts: 4,821
Likes: 19
From: South Dakota
It's just over compensating to try to hold a power level. Like a bad governor....
Needs power, spools up, gets going a hair too fast, spools down, slows down a tick too slow, bounces back up. Mine has always done this while in regen for some reason, only with an unloaded truck.
It just can't find a neutral power level at that speed without any external load like a trailer.
Makes sense that the fix would be an adjustment to whatever governs the turbo boost, or, by adding resistance to the system so it has something to drag on and stabilize.
Needs power, spools up, gets going a hair too fast, spools down, slows down a tick too slow, bounces back up. Mine has always done this while in regen for some reason, only with an unloaded truck.
It just can't find a neutral power level at that speed without any external load like a trailer.
Makes sense that the fix would be an adjustment to whatever governs the turbo boost, or, by adding resistance to the system so it has something to drag on and stabilize.
Thread Starter
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Freshman User
Joined: Jan 2006
Posts: 47
Likes: 0
From: Wisconsin
Turbo Surge
I ended up getting my Nox sensor reprogrammed after a power down, and it helped a little. Hopefully they will come out with a "fix" for this. LOL. Thanks for all the good info.
Junior User
Joined: Oct 2008
Posts: 54
Likes: 0
I know. Would be nice! My truck has been in and out of the dealership since May of this year. The Engineers at Ford are now telling my service manager that they are to do no additional work. Hows that for treating a loyal customer?