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Hey all, new to the forum and having an issue with my 2016 6.7L megacab that I recently bought used. It’s got 55k miles and is bone stock. For about a month now, the truck surges noticeably bad at low throtttle application, especially when cold. It feels like the engine revs up and down quite a few times before shifting gears. If I push the throttle more, or let off more, it goes away. It’d does it with the tow/haul mode on as well. I also notice a slight surge when at highway speeds, usually around 60-70MPH. It feels like the truck keeps hitting a huge frontal gust of wind is the best way to describe it. Fuel filters were replaced 6k miles ago. No CEL ON. Took to dealer and they called me back the same day and said it was done....they did a transmission relearn and it was “fixed”. I insisted they keep the truck until the morning and have the tech drive it when it’s cold to reassure that was the issue. They called back and said it was driving normal. I pick it up today (Sunday) and it’s acitng like they did nothing to it, still surging. I had to take it home because the service dept was closed. Any one have any idea? Any help appreciated.
 

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Bubba8,

Welcome to the forum!
Sounds like a fuel issue. Have you changed the fuel filters since you've had it? That is the first thing I would do. Can't be sure what was done before you got it.
 

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Make sure both fuel filters were changed then check the active air box mechanism to be sure both flaps are connected.
I removed the active air box system from my truck as I have had one almost stall the engine when it was alternating positions. You have to remove the front flap off the stem so the control box stays plugged in or it’ll throw a code.
Also, pull the air tube off all the way to the turbo and check to make sure the silencer foam is not disintegrating.
 

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My truck has done this since new. Esp when cold. You can actually see the rpms move about 100 or so and goes away when you press the pedal down a fair amount. If you barely touch it, it’s worse. Asked dealer about it several times. They say there’s nothing wrong.
 

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Could this possibly be a faulty fuel control actuator?
 

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Hey all, new to the forum and having an issue with my 2016 6.7L megacab that I recently bought used. It’s got 55k miles and is bone stock. For about a month now, the truck surges noticeably bad at low throtttle application, especially when cold. It feels like the engine revs up and down quite a few times before shifting gears. If I push the throttle more, or let off more, it goes away. It’d does it with the tow/haul mode on as well. I also notice a slight surge when at highway speeds, usually around 60-70MPH. It feels like the truck keeps hitting a huge frontal gust of wind is the best way to describe it. Fuel filters were replaced 6k miles ago. No CEL ON. Took to dealer and they called me back the same day and said it was done....they did a transmission relearn and it was “fixed”. I insisted they keep the truck until the morning and have the tech drive it when it’s cold to reassure that was the issue. They called back and said it was driving normal. I pick it up today (Sunday) and it’s acitng like they did nothing to it, still surging. I had to take it home because the service dept was closed. Any one have any idea? Any help appreciated.
I have the same exact problem to the dot. So I started with replacing my Air filter, then my MAF sensor, then I checked all the connections and made sure everything was plugged in properly and still nothing. I then replaced the exhaust pressure sensor and noticed it was plugged with soot, after seeing that I decided to remove and clean the Pressure Sensing Tube which is where the exhaust pressure sensor attaches to. It was plugged up so bad that I couldn’t even blow into it at all. So I took a piece of thin sheet metal and cut out a thin shiver just enough to feed it through the tube and push all the soot out. Took about 20 mins or so but got it all clean out and sprayed it with brake cleaner knowing I have 100% freed all the soot out, I then installed it back in with my new pressure sensor and the problem went away. Now when I start it up in the morning - no more pulsing and looping. Idles very quietly. Hopefully this will help someone out there.
 
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