I have a 2007 Yukon Denali XL with 27,500 miles on it. My wife and I just got back from a 600 mile weekend road trip and on the way home I noticed the truck surging/jerking every now and then when I was going around 75-80mph. It almost felt like the compressor kicking on and off but very harsh. It felt like it was coming from the transmission area. Didnt feel like an engine misfire but I'm kinda at a loss. I would appreciate some thoughts. Thank you.
Serge, while driving...
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Rockytfox
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It sounds like maybe the trans was trying to determine which gear to get into. Did you notice any fluctuation in the rpms?
iwaslowr
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I thought there would be a pic of Soulsea driving (literally) in here based on the title of the thread...
I thought there would be a pic of Soulsea driving (literally) in here based on the title of the thread...
Omg, I thought the same thing!
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X3 on the Soulsea thing
Back on topic....sounds like it was the fuel management system going from 4 cylinder to 8 cylinder to 4 cylinder mode
Back on topic....sounds like it was the fuel management system going from 4 cylinder to 8 cylinder to 4 cylinder mode
Thank you for your responses, sorry if the title was misleading to some I wasn’t sure exactly how to explain it. The RPM didn’t fluctuate when this occurred, and please correct me if I'm wrong but I do not think the 07 model came at the cylinder deactivation on it. I'm really at a loss to what this could be.
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My 07 has fuel management ("cylinder deactivation") on it and does something similar to what you're describing. I was worried about it too until I decided to investigate further and flipped my DIC where I could monitor when it was using all 8 cylinders and when it'd move to just using 4 cylinders. I was able to determine that when I felt the "serge" happen was exactly when it was moving between modes. You might check it out. Not saying its for sure the root of your issue but it's easy to determine if it is before you spend money on parts or diagnosis.
sumo
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