auto quadrajet on manual trans- might need the dashpot??

Discussion in 'The Venerable Q-Jet' started by Clanceman427, Oct 28, 2013.

  1. Clanceman427

    Clanceman427 Hardtops need not apply

    Quick thought on my car- I have a stock 1971 350-4v engine in my Special which has a 4 speed manual trans. I noticed that after I installed the replacement choke pull-off which works as it should, and set my idle speed to 850rpm warm in neutral, that while driving in gear and just rolling along with no gas pedal, I get the slight "burble" thru the exhaust and almost a popping thru the exhaust, not terrible, but there. In 3rd and 4th gear especially.

    I believe I read somewhere that on a stock manual trans quadrajet, there is a dashpot incorporated on it, that is meant for coasting. I think it holds a slight opening on the throttle, so that you don't get too lean while coasting or engine braking perhaps.

    I wonder if I should incorporate one of those? Carmantix, whacha think? Any others out there with some insight? Thanks.
     
  2. agetnt9

    agetnt9 Agetnt9 (Dan)

    I beleave the dash pot is for when U let off the pedal it slows it back down. there is a switch on the trany side cover that will adjust the timing when put in forth gear only.
     
  3. carmantx

    carmantx Never Surrender

    I am not sure about a dash pot set up for the manual tranny. There were some suptle internal differences between standard and auto quadrajets. I will do some digging.
     
  4. moleary

    moleary GOD Bless America

    Thread rehash....What did you learn about the subtle differences Mark?

     
  5. carmantx

    carmantx Never Surrender

    Well, for example, in 71 Quadrajets, the 350 manual had one size larger jets than the automatic. 69/68 the other changes were in the fast idle and regular idle settings, which are just adjustments.

    The 71 455 quadrajet had same jets manual/auto, but had different primary metering rods .045/.044 and secondary metering rods AY/AS.
     
  6. Steve Craig

    Steve Craig Gold Level Contributor

    This might help as the symptoms are the same as you describe.

    CCI20140227_0001.jpg CCI20140227.jpg
     

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