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  1. #1

    Default Need Help 1994 Gmc Suburban, 5.7 L 350 4x4

    Hi,

    i got a smoking problem, lol not health wise but with the truck
    sucks.

    At Cold Start it blows blueish white smoke heavly, and if i try to put the truck
    in drive or Reverse it bogs out and dies. But if i leave it in Neutral and rev for about 1 to 3 mins and blows
    smoke even more but i can then drop it in gear and drive. but once truck starts driveing theres no more smoke
    and it runs fine sounds fine. But once i shut off the truck it restarts the proccess. blows smoke like no tommarow, have to rev to
    get it clear so i can put it in drive or reverse. Any Ideas what it is ?

  2. #2
    Jr. Mechanic
    Join Date
    Mar 2013
    Location
    adirondacks,n.y.
    Posts
    113

    Default

    you might have shot valve guide seals,remember a motor pulls the most vacuum at idle,quick test,at end of commute,shut down quickly,start up in morn.get in and go,try for a day or two,see if you get less smoke.back to high vacuum at idle,it is just sucking oil past the seals cause it is the quickest route to cylinder

  3. #3

    Default

    thank you for the response ill have to give this a try....

  4. #4
    Legend


    Enkeiavalanche's Avatar
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    Piermont,NY, back in Northern NJ now, But may be in IL soon....
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    Default

    Have you ever used Seafoam? Get some at most Autoparts stores and try it.. I would get the spray and Gas/oil Additive.
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  5. #5

    Default

    Quote Originally Posted by Enkeiavalanche View Post
    Have you ever used Seafoam? Get some at most Autoparts stores and try it.. I would get the spray and Gas/oil Additive.
    No i never used seafoam. wha does it do ?

  6. #6
    Legend


    Enkeiavalanche's Avatar
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    Piermont,NY, back in Northern NJ now, But may be in IL soon....
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    Cleans out all the Crap in your intake, Motor, Lubes your top end.. Try it..

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