Lets play a game of what caused it....

[rockola1971]

The subject: 2005 Yukon Denali...for those that dont know....that means factory 6.0 and AWD.
Short background: Yukon has been sitting in drive for an extended period of time.
Symptoms: Hard to start, Blowing major white smoke, Reduced Engine Power on the DIC, wont get to normal idle speed, idles erratically.

I suspected bad gas so I threw in some octane booster, 4 gals of new 87 octane and some HEET. Didnt fix anything.

Ill take all guesses as to the cause of this mess until 10/26/23 1700 EST before I post pic of the cause.

Ill give you 3 clues. (1) Its not a bad battery (2) There are no fuel leaks (3) I dont live in the City.

 

[swathdiver]

Coolant into the combustion chamber(s).

 

[Doubeleive]

VARMIT IN THE INTAKE, NEST ETC,doesn't really explain the white smoke but that's my guess

 

[OR VietVet]

Lean condition caused by a rodent. Haven't figured how yet. I suspect something to do with harnesses effecting fuel delivery or.......

The part about major white smoke can be a lot to one person and not so much to another. The consistency of the smoke tells me something too.

Anyway....good luck and hope one of us gets it. Puzzles are interesting.

 

[nonickatall]

Good game....

My guess is that the car didn't have enough antifreeze in the coolant, there is a coolant connection at the top of the throttle valve, it broke due to frost and coolant was sucked in the intake, which caused the corresponding problems...

 

[Mudsport96]

Coolant reservoir leaking and running down into the airbox....

 

[SpareParts]

Im going to guess you show us a Diesel fuel can.

 

[OR VietVet]

According to my military time figures, we should have known the answer by 1400 PST or 2 p.m. for the non military. I wonder what happened?

 

[Mudsport96]

I use the 24 hour clock most of the time as well, and was wondering when the update was coming.

 

[Doubeleive]

The subject: 2005 Yukon Denali...for those that dont know....that means factory 6.0 and AWD.
Short background: Yukon has been sitting in drive for an extended period of time.
Symptoms: Hard to start, Blowing major white smoke, Reduced Engine Power on the DIC, wont get to normal idle speed, idles erratically.

I suspected bad gas so I threw in some octane booster, 4 gals of new 87 octane and some HEET. Didnt fix anything.

Ill take all guesses as to the cause of this mess until 10/26/23 1700 EST before I post pic of the cause.

Ill give you 3 clues. (1) Its not a bad battery (2) There are no fuel leaks (3) I dont live in the City.