GM Quadrajet Rebuild Tips

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  • Published on:  Sunday, March 3, 2019
  • #Qjet #Quadrajet #Carb

    The next, and final generation Q-Jet employed electronically controlled metering rods, a 36 mhz computer, throttle position sensor, oxygen sensor, MAP sensor and coolant temp! That's right, it used all the same inputs as GM's first DFI, only instead of driving fuel injectors, it used the feedback loop from the O2 to PWM (modulate) the metering rods in attempt to maintain the proper fuel/air ratio. The system worked amazingly well ! However, once DFI (throttle body injection) hit in 1982 (Cadillac) and in 1988 for the rest of GM, the under hood complexity (vacuum lines, wires, etc) was vastly improved.... and the beloved Q-jet was part of history
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