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When should secondaries open on factory q-jet

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ColAdo82K5, Oct 16, 2001.

  1. ColAdo82K5

    ColAdo82K5 1/2 ton status

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    Hey all,
    Should the secondaries on the q-jet open when you rev the engine in park or neutral ? If so/not is it the same for all year q-jets with the different style of chokes etc ?
    Blake
     
  2. POWERMAD

    POWERMAD 1/2 ton status

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    On a Q-jet the secondaries will not usualy open when the rig is parked and in nuetral.
    There is usualy not enough demand for the secondaries to open for more than a second.
    The throttle plates will be open but the air valve will only open up as the demand for more air is needed.
    When the air valve opens it raises the metering rods allowing fuel to flow into the secondaries.
    All Q-jets are this way.

    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  3. Triaged

    Triaged 1/2 ton status

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    The secondarys will open BUT the secondary air door (looks like a choke plate over the secondarys) will only open under load (low vacume). The secondary butterflys should start to open at about 1/2 throttle.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  4. FWP

    FWP CRS

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    Powermad's right on. A quick WOT will open the air valve for a second, till the gulp of air gets in the motor, then it will close again.

    <a target="_blank" href=http://coloradok5.com/gallery/75K5>http://coloradok5.com/gallery/75K5</a>
     

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