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2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

This is a discussion on 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up within the Technical / Maintenance forums, part of the General Discussion category; Well... My new baby is at the dealer today. Started keeping a log of how often it was smoking on ...

  1. #1
    Resident Dick Quyonmob's Avatar
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    2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up


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    Well...

    My new baby is at the dealer today. Started keeping a log of how often it was smoking on start-up...

    3 times in 2 days was too many (thats 3 times out of 4 starts). This tells me it is more than one bad valve seal or valve guide. Happens completely inconsistently.

    The amount of blue smoke varies from puff to a cloud. Any amount is embarrasing for a 50,000mi truck.

    I made reference to the TSB regarding "nicked valves" and gave them the "smoke log".

    160,000km (100,000mi), 5 year powertrain warranty has 14 months and 50,000mi to go yet.
    Last edited by Quyonmob; 09-02-2010 at 08:15 AM.

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    "Could not reproduce customers complaint. Engines under stress or load at start-up will smoke due to fuel trim not being correct until engine at operating temp. Color of smoke would have been help."

    1- Color of smoke was at top of work order, BLUE. Had it not been, they had the truck for 2 days, a phone call could have solved that.

    2- Engines under stress?!?! Is the tech implying I start my truck with the pedal to floor or slam it into gear before the starter has even disengaged? I told him the smoke is immediately after the engine fires...

    3- Fuel trim? Its Blue oil smoke after the engine starts. Not gray smoke with a cold engine under a load...

    I'll be talking to the service manager.

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    Registered User Tweaks's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    The service manager is probably the mechanic's drinking buddy, but you gotta start somewhere I guess. At least this has been documented and while still under warranty. This will help as you keep a log of what color smoke, how often, and what oil consumption per 3k miles or even less might be when it all comes to a head and action needs to be taken.
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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Quote Originally Posted by Tweaks View Post
    This will help as you keep a log of what color smoke, how often, and what oil consumption per 3k miles or even less might be when it all comes to a head and action needs to be taken.
    I handed them EXACTLY this. Have kept a log for the last 2500km (1550mi) of when, quantity of smoke, driving distances and down time between occurrences.
    Last edited by Quyonmob; 10-18-2010 at 09:46 PM.

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Service Manager is "willing to work to solution".

    The smoke is driving me crazy.

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Truck is going in in 2 weeks for PIP4492K.

    That little gem wasn't easy to find, but certainly made the difference in getting the ball rolling.

    http://www.camaro5.com/forums/showthread.php?t=70853

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Fixed under warranty. Fixed orifice PCV fail.... Valve cover was replaced as mentioned in the PIP above.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    "its normal. all gm vehicles smoke like that."

    :LOL: I bleed GM Blue, but I had to lol. Those valve stem seals in SBCs suck. My 88 IROC used to look like a 2 stroke dirtbike on a cold start. Glad you got yours fixed.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    My dad has two 5.3Ls, both burn oil and coolant. They don't leak, the GMC doesn't smoke and the Chevy smokes black and sometimes blue at startup. But this is very common for some reason with these engines.
    Last edited by 94_c/1500; 10-10-2010 at 04:35 PM.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Problem seems resolved. 800km smoke free km and counting.

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Almost 20K miles since this, no smoke, oil consumption is an excellent 1/4qt in 3000mi.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    I hope it keeps up like that for you. As I posted in that other thread we're responding in, it seems a lot of people with the 5.3/AFM are having oil consumption issues and the dealers are all giving them the runaround on it. Some have had all order of attempts at fixing it including replacing all the pistons, etc. and the problem often comes right back.

    Richard

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Quote Originally Posted by someotherguy View Post
    I hope it keeps up like that for you. As I posted in that other thread we're responding in, it seems a lot of people with the 5.3/AFM are having oil consumption issues and the dealers are all giving them the runaround on it. Some have had all order of attempts at fixing it including replacing all the pistons, etc. and the problem often comes right back.

    Richard
    L33 does not have AFM.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Kewl. I didn't look long enough to see which engine you had...just saw 5.3 and late-model.

    Richard

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    Resident Dick Quyonmob's Avatar
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Quote Originally Posted by someotherguy View Post
    Kewl. I didn't look long enough to see which engine you had...just saw 5.3 and late-model.
    Richard
    Took me a while to find an L33 truck, as that AFM was not my cup of tea, lifters have a hard enough life in Canada.

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    glad to hear it's fixed
    Last edited by Benny00Z71; 12-10-2011 at 10:48 AM.
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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    Quote Originally Posted by 94_c/1500 View Post
    My dad has two 5.3Ls, both burn oil and coolant. They don't leak, the GMC doesn't smoke and the Chevy smokes black and sometimes blue at startup. But this is very common for some reason with these engines.
    my 05 did the same thing had it at two dealerships and nothing, finally took it to the "big city" dealerships and in an hour they told me cracked heads. it was fixed under warranty. i figured that since it was random as in i could let the truck sit overnight and wouldnt smoke but drive it to town and get back in after 30 min it would smoke. so far so good no more smoking or coolant loose. hope this helps
    2012 greystone grey chevy silverado crew cab 2wd stock

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    Re: 2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up

    to the OP glad to hear they got you taken care of. I know what you mean embaressing about driving a new truck and it having smoke, espically when i had a 1990 z71 with 300k and didnt smoke.
    2012 greystone grey chevy silverado crew cab 2wd stock

 

 

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