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2008 Yukon Denali XL: Rough Idle/Accel after changing spark plugs
Hi Swathdiver, OK, so I’m a ignorant guy when it comes to some things you just asked me about. I’m not exactly sure what a “flat or lumpy lifter valley cover” is that you’re asking me about. I do know that we purchased our 2008 Yukon Denali XL at 60,000 miles. We did the car fax on it, and...- Reid near Seattle
- Post #12
- Forum: Engine & Drivetrain
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2008 Yukon Denali XL: Rough Idle/Accel after changing spark plugs
Hi Swathdiver, You are so right. I just checked another location that lists all the GMC Yukon’s spark plug gaps, and the 2008 6.2 liter is 0.04. Maybe the guy simply read it wrong, and saw that the very next line for 2009, is a 0.044, but not the 2008. So I went in and pulled out each plug...- Reid near Seattle
- Post #9
- Forum: Engine & Drivetrain
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2008 Yukon Denali XL: Rough Idle/Accel after changing spark plugs
Thanks for the suggestions. A few things: Swathdriver, the auto parts store told me that I needed to gap the plugs (Yes, NGK was the correct name...) at 0.044 for a 2008 Yukon Denali XL. If you have different more correct info, please let me know. I have a scan tool, (as Hi-psi suggested)...- Reid near Seattle
- Post #6
- Forum: Engine & Drivetrain
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2008 Yukon Denali XL: Rough Idle/Accel after changing spark plugs
Hello everyone, I’m new to this forum. I have a 2008 Yukon Denali XL, with 160,000 miles on it. I decided to change the spark plugs the other day because the original ones were still in it. I pulled out the old plugs, put in the new ones, added some dielectric grease to the boot/caps, and...- Reid near Seattle
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- Replies: 23
- Forum: Engine & Drivetrain
