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  • smoke when i start up

    everytime i start the truck i see smoke come out the back and i dont know why...its like a white/grayish color. I just got a new cat converter u think that'll do the trick? I'll find out when i start it in the morning

  • #2
    Re: smoke when i start up

    Valve seals, very common in SBC's prior to '94.
    2016 Carlisle All Truck Nats info..
    http://www.fullsizechevy.com/forum/o...g-5th-7th.html

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    • #3
      Re: smoke when i start up

      sounds like your burning a little oil.
      02' Chevy Tahoe,projectors/angel eyes,CAI.
      91' GMC Sierra step-side
      88' Chevy Silverado step-side,new paint,all new interior,blue neon,LED taillights,chrome pipes
      http://www.cardomain.com/ride/2658628

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      • #4
        Re: smoke when i start up

        Yeah, my truck does the exact same thing. What happens is, when your truck sits, the oil just chills in the heads and the valve seals leak a little, so a little bit of oil gets into the cylinder and it burns up when you start it. I'm gonna do a valve job on my truck this summer to fix it, it's not an emergency, but it needs to be done.

        91 RCSB C1500 4.3 4L60 Cash for Clunkered 8/3/09
        09 Ford Mustang Bullitt #5998 Brenspeed Tune, LCAs. 13.35 @104.3
        94 Ford Mustang SVT Cobra ModdedSOLD 9/4/08

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        • #5
          Re: smoke when i start up

          yea most likly the valve seals, they go pretty easily over time
          daily driver: 97 obs on 22 rockstars, bagged all around with all braided steel 1/2 line

          my toy: 83 toyota rock buggy

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          • #6
            Re: smoke when i start up

            could that be the answer to how the truck performs as well? it doesnt have as much power as it used to, thought it was a clogged cat so i fixed it

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            • #7
              Re: smoke when i start up

              If the valves are leaking the same as your valve seals then you may need a head job. The best way to check this is a leak down test. Also how long since a through tune up/filter change? I had a 89 2wd I got for parts that the guy said had a worn out motor. A tune up and some other odds and ends later, the truck ran great and I sold it for a good profit.

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              • #8
                Re: smoke when i start up

                Originally posted by chevymayne
                could that be the answer to how the truck performs as well? it doesnt have as much power as it used to, thought it was a clogged cat so i fixed it
                yes because your pistion rings leak so you dont get as good a compresion at tdc and plus the oil is being burned along with your gas. your doesnt sound too but so you might be able to buy some sealer that you add to your oil, i never tried it but sounds like it works
                02' Chevy Tahoe,projectors/angel eyes,CAI.
                91' GMC Sierra step-side
                88' Chevy Silverado step-side,new paint,all new interior,blue neon,LED taillights,chrome pipes
                http://www.cardomain.com/ride/2658628

                Comment


                • #9
                  Re: smoke when i start up

                  thanks for the help guys i really appreciate it...gettin fixed tomorrow

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                  • #10
                    Re: smoke when i start up

                    this is very common with gm motors especially 350s. just the black smoke at start up. every chevy i've had except for a brand new one did this. i had a 94 z28 camaro that started doing it around 70k miles. every ford i have had didn't do it only the chevy's. i'm not making out like this means it is inferior. i never worried about it. it didn't do anything to the performance of the vehicles.
                    1990 suburban slverade 1500 4x4
                    2000 cheyenne 2500 utility body 5.7
                    1993 ford 5.0 mustang lx
                    2003 ford mach 1 mustang
                    2000 ford f350 7.3 diesel
                    1986 chevy custom deluxe 20 6.5 totalled 3/9/08

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                    • #11
                      Re: smoke when i start up

                      valve seals
                      1994 ECSB K1500 F44 Z71, 295/75/16 tires.

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                      • #12
                        Re: smoke when i start up

                        yep. valve seals. my 86 camaro did the same thing. I'm not gonna say how much it cost to fix, but it was a healthy amount
                        91 K1500 ECSB
                        LQ4/80E/241/60/14SF/4.88/38s
                        EFILive
                        98 2Dr Tahoe
                        L31/0411/60E/241/4.10/285s
                        EFILive, NBS 10b w/discs

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                        • #13
                          Re: smoke when i start up

                          lemme know some prices so i can get an idea....

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                          • #14
                            Re: smoke when i start up

                            haha i just kept running my camaro, and everything i drove with that problem. it just blew smoke at start up, but thats all. like i said it never interfered with the sufficiency of the vehicle.
                            1990 suburban slverade 1500 4x4
                            2000 cheyenne 2500 utility body 5.7
                            1993 ford 5.0 mustang lx
                            2003 ford mach 1 mustang
                            2000 ford f350 7.3 diesel
                            1986 chevy custom deluxe 20 6.5 totalled 3/9/08

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                            • #15
                              Re: smoke when i start up

                              you could run it like that for like up to a year maybe more with out any more damage being caused
                              02' Chevy Tahoe,projectors/angel eyes,CAI.
                              91' GMC Sierra step-side
                              88' Chevy Silverado step-side,new paint,all new interior,blue neon,LED taillights,chrome pipes
                              http://www.cardomain.com/ride/2658628

                              Comment

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