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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: RC 415 on January 14, 2007, 03:46:00 pm

Title: Smoke on startup
Post by: RC 415 on January 14, 2007, 03:46:00 pm

Every morning when I start my 1983 chevy the truck produces a lot of grayish/blackish smoke out the tailpipes for about 3 minutes, the truck has a newer 350 crate motor with about 5k miles on it, and it also has new plugs, plug wires, and dist cap, a recent radiator and flowmaster dual exaust. What could be causing this?

Title: Re: Smoke on startup
Post by: 75 C20 on January 14, 2007, 06:00:00 pm

sounds like valve seals to me

Title: Re: Smoke on startup
Post by: RC 415 on January 14, 2007, 07:55:00 pm

so you think it oil?

Title: Re: Smoke on startup
Post by: RC 415 on January 14, 2007, 10:51:00 pm

Well I was just told that the choke needs adjustment, as the truck is running too rich in this cold weather, anyone know how I go about doing this?

Title: Re: Smoke on startup
Post by: 75 C20 on January 15, 2007, 03:19:00 pm

wut kinda carb u got?

Title: Re: Smoke on startup
Post by: RC 415 on January 15, 2007, 09:07:00 pm

Rochester 4Bbl, The choke is electric

Title: Re: Smoke on startup
Post by: VileZambonie on January 15, 2007, 10:39:00 pm

Black smoke = unburned fuel

blue/grey smoke = oil

white smoke = ATF or Coolant

So 1st determine what color smoke you have. Just take the air cleaner off and see if the choke flap is opne when it's warm