2007 6.2 Denali 230k smoke on start up

[Barry Grenville]

@007 6.2 230k Denali smokes intermittently on start up

 

[ls1frc]

What color?

If it's blue and goes away, it's oil and probably valve seals.

 

[Barry Grenville]

Blue yes and goes away in seconds truck runs normally 1q per 1000 miles

 

[Barry Grenville]

different issue than 5.3?

 

[blackelky]

If you fix it. Might as well do a cam and valve job while you're at. I personally would run it until it dies with the mileage.

 

[Barry Grenville]

running till dies. yes that's where I going

 

[j91z28d1]

change valve guide seals and add a catch can. should help

 

[petethepug]

Wow! Lotta high milage 07/08 Denali / 6.2L posts this week. It’s homage to the LS motors giving 2-300k in milage.

With that oil consumption waiving a flag for valve seals it’s kinda thrown a flag for a 50k ~ miles left warning. Waiting for bearing failure due to a poss unforeseen low oil sitch isn’t good because these 6.2 cores are worth big $ these days.

Just saw an episode on PowerBlock of an early normally aspirated CTS-V swap. They swap’d (what they thought was) a 400hp 5.7L to a 6.0L 2500 / 3500 iron block alum head 380hp motor. They took the 6.0L truck motor, added new aftermarket alum heads, a cam, headers and everything thing else stock.

After the tune, on the same ECU, the n/a motor made 507 hp. Just say’n, salvage the 6.2L before it grenades. Start shopping for new heads, cam & headers now.

Have a plan to pull the L92, have it machine serviced as a short block. Save $ on machining heads and get new aftermarket alum heads, cam & headers. Get it tuned and have budget 500hp budget rebuild. Milage will go up because the motor’s not going to lift a finger anymore pulling that AWD XL Denali around at 1500 rpm.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

I suggest putting an oil catch can on it first and see if the smoke goes away.

 

[donjetman]

@007 6.2 230k Denali smokes intermittently on start up

Do you know if the "improved" driverside valve cover has been installed on your engine? as decribed in this GM technical service bulletin:
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

Installing a catch can is a good thing:
https://www.tahoeyukonforum.com/threads/get-a-catch-can-before-any-mods.49716/page-53#post-1288561