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Exhaust Emission Control System

Discussion in 'Early CJ5 and CJ6 Tech' started by Fresbone, Sep 10, 2022.

  1. Sep 10, 2022
    Fresbone

    Fresbone Member 2022 Sponsor

    Fresno, California
    Joined:
    Jul 29, 2022
    Messages:
    67
    My serial number is 8305 S 221570. The SM indicates that a letter S following the serial number prefix indicates the engine is equipped with an exhaust emission control system, but I don’t have one. I also don’t have an oil bath air cleaner (I have an edelbrock air filter). Would the EECS have been removed when the oil air bath cleaner was swapped out, or am I misunderstanding the meaning of the “S” on my S/N?
    Thanks.
     
  2. Sep 10, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
    Messages:
    3,808
    The main emission system was a v belt driven air pump with injection in the head exhaust ports. Do your heads have plugs in those? There was also a "valve" in at least the dry type airfilter inlet to help warm the air during cold weather. I do not recall that feature on my 67 with the oil bath air filter but it did have the pump. The FSM describes all that in detail.
     
  3. Sep 10, 2022
    Fresbone

    Fresbone Member 2022 Sponsor

    Fresno, California
    Joined:
    Jul 29, 2022
    Messages:
    67
    I don’t have any of that, which is why when reading the FSM I was thrown off by what it said the S in the serial number meant.
     
  4. Sep 11, 2022
    Twin2

    Twin2 not him 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Virginia Beach, VA
    Joined:
    Apr 28, 2011
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    5,290
    air pollution stuff . almost always gone
     
  5. Sep 11, 2022
    Cj5dale

    Cj5dale Member 2022 Sponsor

    Knoxville, Tn
    Joined:
    Aug 19, 2021
    Messages:
    382
    Heres a pic of part the smog contraption that was on my v6 when I bought the jeep.

    upload_2022-9-11_9-36-2.jpeg

    along with this on the drivers side
     
    Fresbone and Stakebed like this.
  6. Sep 11, 2022
    Cj5dale

    Cj5dale Member 2022 Sponsor

    Knoxville, Tn
    Joined:
    Aug 19, 2021
    Messages:
    382
  7. Sep 11, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
    Joined:
    Sep 17, 2009
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    3,808
    They run better without that stuff. In a lot of places, not having the system isn't a problem but maybe in the peoples republic that isn't the case. Do you need to reinstall it? Place a WTB add in the classified.
     
  8. Sep 11, 2022
    dnb5853

    dnb5853 Member 2021 Sponsor

    Grand Mesa, CO
    Joined:
    Aug 13, 2006
    Messages:
    942
    That bracket may have been for the air pump, but also looks ALLOT like a portion of the power steering bracket of the era. Keep that part!
     
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  9. Sep 11, 2022
    Rozcoking23

    Rozcoking23 RUN & GET BIT!

    Stockton, CA
    Joined:
    Mar 29, 2008
    Messages:
    492
    California does not require smog on any year before 1976. I have all the smog equipment that came off my 1970 in a box in the shop.
     
    Fresbone likes this.
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