73 TCS -"Transmission Controlled Spark System Check" Help! - NCRS Discussion Boards

73 TCS -"Transmission Controlled Spark System Check" Help!

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  • Jimmy P.
    Extremely Frequent Poster
    • June 24, 2014
    • 1695

    73 TCS -"Transmission Controlled Spark System Check" Help!

    I'm making some last minute checks on my car before having it judged in June. The 73-74 TIM&JG says that all manual transmission cars are equipped with a transmission controlled vacuum advance system. To see if it is working properly, with motor running put the car in neutral after the engine is sufficiently warm to release the choke put the car in 4th gear and the distributor will receive full vacuum bumping up the idle. And the JG says this should also occur in 3rd gear after 20-30 sec. on the 73 with a manual transmission. Following this procedure on my car it only bumps up the idle in 4th gear and NOT in 3rd.
    My question is- Is my system functioning properly, and is the TIM&JG in error here?
    Hopefully I'll hear from you 73 guys.
    Jimmy
    1973 Convertible
    L48,M20,N40
    Mille Miglia Red/Oxblood

  • Harmon C.
    Extremely Frequent Poster
    • August 31, 1994
    • 3228

    #2
    Re: 73 TCS -"Transmission Controlled Spark System Check" Help!

    Your system is working as it should.
    Lyle

    Comment

    • John S.
      Very Frequent User
      • June 15, 2015
      • 505

      #3
      Re: 73 TCS -"Transmission Controlled Spark System Check" Help!

      Jim, +1 on the '73 TCS system working in 4th gear only. The TCS in my '73 L82 4 speed allows vacuum advance on initial cold start then shuts off when the time/temp cuts it off. After that it only allows vacuum in 4th gear, nothing in 3rd.
      1973 L82 M21 4 Speed, very original and well documented driver/survivor
      NW Chapter Member, 2016 Bend Regional Top Flight
      73/74 TIM&JG 3rd Edition Revision Team Member

      Comment

      • Jimmy P.
        Extremely Frequent Poster
        • June 24, 2014
        • 1695

        #4
        Re: 73 TCS -"Transmission Controlled Spark System Check" Help!

        Lyle and John,
        Thank you both for responding. I'm glad my TCS is working as it should. I'll make a note of this in my TIM&JM.
        Jimmy
        1973 Convertible
        L48,M20,N40
        Mille Miglia Red/Oxblood

        Comment

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