04 sierra z71 smoking when I start. HELP

[jberry]

My 04 GMC sierra z71 is now smoking quite a bit when i start it in the morning. I have been told it is probably leaking valve seals. I know the fix is expensive so I am looking for options...

Additive?
shade tree mechanic that can do it cheaper?
Thoughts?

 

[338Shooter]

Does it quit after it warms up?

 

[tran]

Sounds like Valve seals to me.

 

[advmotoxc]

Yeah, if it only does it when you start it and then it goes away its def valve seals. Thicker oil could possibly make it smoke less, but only way to fix is replace them.....

Sorry

 

[Shoot Summ]

Does it do it every time? My 05 Sierra used to do it every once in awhile.

 

[Double_tap]

Yup, typical for a GM engine when the valve seals start wearing out.

 

[Deleted member 6551]

Sure its smoke and not just condensation? If smoke then yea, valve seals.


Mileage & engine?

 

[smax]

Just to rule it out you should probably check that your pcv valve isn't stuck. Whey they get stuck in these trucks it fills the bottom of the intake manifold with oil. You can pull the throttle body off pretty easy and see if there is any oil in the intake.

 

[jberry]

You guys are awesome.
It has 174k. Been well taken care of. I am second owner.
5.3 liter V8 4x4.

 

[OutdoorTulsa]

Another vote for a possible stuck or clogged PVC valve, worth checking this before spending any big money. That is if you don't have a permanent one. Remove and shake to see if it rattles, start the engine and see if it sucks. Might be worth seafoaming the engine. In the end it's likely the valve seals but worth a shot.

My 06 Sierra smokes and rattles all the time especially under hard acceleration. Course it’s a Duramax!!!