Manual choke adjustment

Discussion in 'Troubleshooting & Diagnosis' started by 70RSZ28CAMARO, Dec 30, 2017.

  1. 70RSZ28CAMARO

    70RSZ28CAMARO New Member

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    Dec 19, 2003
    Long Island, NY
    Hey guys I got a 1970 Z 28 with a Holley 4150 and it has a manual choke setup with coil and rod what is the best way to do a choke adjustment with this type of setup. Thanks
     
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Nov 4, 2004
    Ringgold, GA
    A manual choke will not have a coil, just a cable running into the cockpit and you adjust it by pulling out on the knob until the engine is warmed up, then push it back in. I'm going to assume you have an electric choke. Here's a quick u-tube video that will get you started in the right direction.


    If you need more assistance, feel free to post back up.
     
  3. Gary S

    Gary S Administrator Lifetime Gold Member

    21,259
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    Apr 14, 1999
    Bismarck, North Dakota
    Corky is correct. There is no coil or rods for manual choke, only a choke cable.

    The simple way to adjust the electric choke on quadrajets (holley might be similar) is to set is so it just closes lightly at 70 degrees outdoors.
     
  4. roeville

    roeville Veteran Member

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    Oct 9, 2000
    SF East Bay CA
    Sounds like you’re describing the stock automatic choke with a thermostatic coil mounted on the intake manifold.
     
  5. 70RSZ28CAMARO

    70RSZ28CAMARO New Member

    28
    0
    Dec 19, 2003
    Long Island, NY
    Sorry for the confusion it’s one of those chokes that works with a coil that’s mounted to the intake manifold. There’s a rod connected to the small box that holds the coil. When it’s cold the coil pushes the rod up which closes the choke plate n the opposite when it’s hot.
     
  6. McCune

    McCune Veteran Member

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    Aug 22, 2015
    st.george utah
    Just a reference photo B24EEA1C-EEBE-406D-A922-9ECE686FE6F8.jpeg
     
  7. 70RSZ28CAMARO

    70RSZ28CAMARO New Member

    28
    0
    Dec 19, 2003
    Long Island, NY
    Yes, McCune that is it. Although mine looks slightly different. What's the best method for adjusting the choke plate so that it's just barely open when cold using this thermostat coil and the rod that connects to it ? Thanks
     
  8. Gary S

    Gary S Administrator Lifetime Gold Member

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    Apr 14, 1999
    Bismarck, North Dakota
    This is what GM calls the divorced choke. The recommended way to adjust it is to bend the rod connecting the coil to the choke on the carb. Again, you want it to just close lightly with the temp at 70 degrees.
     

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