Recent content by LoggNM
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2019 GMC Yukon Denali Rough Idle
In case this helps someone - I resolved this issue as a hairline crack in one of the (new) AC Delco sparkplugs. The plug was fresh from the motor reinstall, and appeared fine out the box, but was damaged during manufacture or got bumped/dropped somehow on its journey to me. Very subtle...- LoggNM
- Post #9
- Forum: Engine & Drivetrain
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2019 GMC Yukon Denali Rough Idle
I have a similar symptom on a 2011 6.2L Yukon Denali that has been recently overhauled. Seems to run fine when cold, and accelerates with no discernable miss, but once it's warm an intermittent miss-like condition occurs when idling at a stoplight. The miss doesn't develop right away when at a...- LoggNM
- Post #7
- Forum: Engine & Drivetrain
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22" chrome wheel leaks
I had my local tire shop remount two of my 22 inch chrome rims with bead sealant - worked well to address slow leaks - like 5 psi down after 2 weeks. They said the chrome finish around the rim loosens and creates an air path that's between the base rim (alloy) and the chrome finish. They'd... -
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IAT Always Reads 32°
I ended up purchasing a diagram for this model - may be slightly different for different models and engines. On the 2011 Yukon Denali with the L94 6.2 AFM Flex Fuel motor, the IAT is integrated with the MAF and there are two separate wire connections between the sensor and the ECM X1...- LoggNM
- Post #10
- Forum: Engine & Drivetrain
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IAT Always Reads 32°
Hey CruelJung (et al.) - I have an open circuit somewhere between my ECM and IAT sensor on my 2011 Yukon Denali XL L04, so the ECM recognizes the voltage is above range and substitutes a plug value. Truck runs but has a permanent P0113 code that I need to resolve. I know the tan and tan/blk...- LoggNM
- Post #9
- Forum: Engine & Drivetrain
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Good reason to run a 6.2 on premium fuel
Crazy old thread but I just tore down my L94 that was very locked up (no rotation at all), and I appears the root cause of the engine damage may have started with a dropped intake valve seat that took out the #1 piston and cracked the small end of the conrod. I understand valve seats can loosen...- LoggNM
- Post #100
- Forum: Engine & Drivetrain
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Pulling L94 engine and 6L80 trans as a unit
Its not clear if the connecting rod failed first or the piston fractured, but it clearly wasn't an oil starvation issue - once I removed the windage tray and unwedged the part of the rod that didn't break loose - it turned freely. I suspect the piston fractured, got pushed up and down and... -
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Pulling L94 engine and 6L80 trans as a unit
I just removed a seized L94 and 6L80 trans together as a unit, and wanted to describe the process I used in case it helps others. 2011 Yukon XL Denali AWD. My engine was seized, and I knew it wasn't a bearing issue because the motor wouldn't turn much at all, and it was a hard lockup. Since I...
