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Thread: New to me 82 auto trans running rich

  1. #1
    Senior Member SBL's Avatar
    Join Date:  May 2011

    Location:  Treasure Island, FL

    Posts:    103

    My VIN:    10342

    Club(s):   (DCF)

    New to me 82 auto trans running rich

    Hi all:

    Well I could not keep out of it for long. Picked up a 1982 automatic. Ran poorly with a lot of bogging. I reasoned that it was running too rich and probably not in closed loop. Worked on wiring and hoses, and then had to turn CO screw a half turn CCW and to get it to run reasonably well. I have always had manual Deloreans, so I don't know how it is supposed to run, but so far it has reasonable power even with AC on from a dead stop (which it did not have before) so I feel I am headed in the right direction.

    Here are my tests of frequency valve duty cycle (actually dwell method, 8 cylinder setting, data shown is multiplied by 2) :

    cold 52 stable
    warm 40-60 varying
    warm O2 sensor disconnected 54 stable
    warm O2 sensor input to ECU grounded 80 stable
    warm O2 sensor input to ECU +1.5 VDC 32 stable
    warm WOT switch engaged 60 stable

    When driving, WOT second gear kick-down works.
    Idle 750-800.

    To me, I think I am still a bit too rich. Agree?

    Steve Liggett
    Treasure Island, FL
    1982 automatic, VIN 10342, grey int

    Previous: VIN 5983, VIN 3670
    Who knows where my previous 1981 with 6 cylinder Chevy engine is these days (cannot find that VIN) ?

  2. #2
    Administrator Ron's Avatar
    Join Date:  Jun 2011

    Location:  North GA

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    1/2 turn is a lot, but it looks like you might be good if you set it to 40 (+/- ~5 swing).
    Don't forget to plug the adjustment hole when reading...

    P.S. Congrats!!

  3. #3
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

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    Congrats Steve!

    1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
    Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
    2006 Dodge Magnum R/T (D/D)
    2010 Camaro SS (Transformers Edition)

  4. #4
    Delorean Guru
    Join Date:  May 2011

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    You want to aim for 35-45 dwell but if you have vacuum leaks you will still be running rich. Adjusting the mixture screw is the very last thing you do after fixing any vacuum leaks, cleaning the injectors, and changing the spark plugs and filters. Also check the timing and ignition advance. Depending on the mileage you might have to change the O2 sensor and adjust the valves.
    David Teitelbaum

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