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Take me to school...

Discussion in 'The Venerable Q-Jet' started by gbodyfan, Sep 5, 2006.

  1. gbodyfan

    gbodyfan Gbodyfan

    I have a 1986 Regal with the POS 307 Olds in it; the car is not a daily driver and is just waiting for the Buick 455 to be transplanted. I want to keep the car drivable for now and am attempting to fix several problems including non-functioning SMOG equipment and several carb problems. I have pulled out some of the SMOG stuff including disabling the EGR (this was done due to the carbon buildup and the many broken vacuum connections).

    What I need to know is this; what are the electrical connections for on the carb?

    Any feedback is appreciated.

    gbodyfan
     
    gbodyfan, Sep 5, 2006
    #1
  2. scottie

    scottie Member

    That carb is a feedback (CCC) model. One electrical connection is to the TPS sensor and the other is to the mixture control solenoid(MCS), which adjusts the main metering based on what different sensors are doing. The main sensors are the O2 sensor, the throttle position sensor (TPS), and the manifold air pressure sensor(MAP). The computer takes these imputs and calculates how rich or lean the main metering jets need to go.These calculations are based on all the smog junk connected and working, so it will work but not as intended. If you removed some smog junk on the engine I would just swap over to a non-computer carb and distributor. Otherwise I would get all the smog junk hooked back up and get the CCC q-jet working. Either way its going to be some work. If you really want to go the second route, I suggest picking up a factory service manual.
    Good luck.
    Scottie
     
    scottie, Sep 18, 2006
    #2
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I agree, if you want the engine to run well, you need to swap out the carb and distributor. The 86 307 used EST(Electronic Spark Timing). The computer set the timing under varying RPM, and adjusts the mixture in the carb based on input from the other sensors. If you disconnect the smog stuff, the computer will light the check engine light and go into "Limp Home" mode. It will set timing and mixture so the engine will run well enough to keep you on the road, but the engine will not run efficiently and gas mileage and performance will suffer.
     
    LARRY70GS, Sep 18, 2006
    #3
  4. gbodyfan

    gbodyfan Gbodyfan

    Thanks guys...

    Thanks for the feedback guys, I knew that there would be someone who would know. This carb has been a pain in my behind -- right now it dumps a ton of gas into the engine.

    I suspected that I would have to make the swap. I have already have another non-smog Q-jet but am looking for a non-smog distributor. I'm hitting the junkyard Friday.

    gbodyfan
     
    gbodyfan, Sep 27, 2006
    #4

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