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fuel/carb ????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NoSmog73, Jan 1, 2002.

  1. NoSmog73

    NoSmog73 1/2 ton status

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    Ok I will be going to tpi soon but I would like to use the blazer till then here goes I start it and it will go to about 1300-1400 rpms with the choke on and then It will start going down in rpms till it shuts off. And when it is warmed up when I come to a stop it will idle way low and sometimes turn off (if I keep it in nuetural at the light the rpms stay at about 900 and then shift into gear and go) could it be the idle screw (to low)or the fuel pump, It has a new filter and fuel line.The motor is stock with a rodchester did the tune up stuff about 3 months ago???? Any ideas would help of much help thank you.
     
  2. Twiz

    Twiz 1/2 ton status

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    It idles at 900 RPM in nuetural? But in gear it'll stall-out?
    Kinda-hooky.
    Idle speed in nuetuural should be around 650-700 or so, maybe a bit more with a auto-trans. The idle speed screws are known to back-out over time. So are the A/F mixture screws.
    Does it seem to load-up at a idle? (rich-mix) Shut the engine off, count the turns it takes to lightly seat the mixture screws, on both, the left bank and right bank. If the turns are differnt, (like for example 2 turn on the left bank, 2.5 turns on the right bank) then shoot for something in the middle. (like 2.25 turns out from the seated position)
    Check for vacume leaks too.

    Still, knida goofy to be idleing at 900 RPMs out-of-gear, but will stall-out in gear.
    Good luck with it.

    <font color=blue>Wow Factor
    A SBC at 6000 RPM, Piston speed of 60 MPH.
    3- The intake charge reaches a speed 4 X greater than the piston.
    Thats 240 MPH.
     
  3. HEFTY

    HEFTY Registered Member

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    check your vacuum lines.
     
  4. NoSmog73

    NoSmog73 1/2 ton status

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    ya had nothing but problems with the carb since I bought this blazer and I will get the tpi set up soon.I will check the vac line again
     

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