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Thread: 2 CTS sensors, what do I do?

  1. #1
    Join Date
    Nov 2011
    Location
    Stuart, FL
    Posts
    78

    2 CTS sensors, what do I do?

    I am so close to driving my truck I can taste it. I have the LM7 in and the carb conversion is complete. I have a TPS sensor wired to the carb, I have the VSS hooked up as well. I noticed there are two coolant temperature sensors, one on the drivers side head and one that was on the TBI 5.7 intake next to the thermostat. Of course the new LM7 dosent have a port for the other CTS sensor and I believe my Trans needs that signal correct? Can I just splice the wire to the one hooked up on the head or do I need to tap into the water system somewhere for the 2nd sensor?
    1994 Silverado 2 door sport side

    Soon to install:
    5.3 LM7, Thumpr Cam, LS6 lifters/springs, LS1 1.7 rockers, 862 heads milled 0.015 and 45 degree cut valves, LS2 timing set, Performer RPM intake, Holley 4150 750cfm carb, MSD 6LS ignition, 2" Primary LT headers 3" X-pipe and two Loudmouth II Mufflers. Vigilante 9.5" 2,800 Stall.

  2. #2
    Join Date
    Sep 2011
    Posts
    264
    I don't see why your trans would need a signal for what the coolant temp of the engine is......

  3. #3
    Join Date
    Jan 2013
    Posts
    21
    Quote Originally Posted by 94_OBS View Post
    I am so close to driving my truck I can taste it. I have the LM7 in and the carb conversion is complete. I have a TPS sensor wired to the carb, I have the VSS hooked up as well. I noticed there are two coolant temperature sensors, one on the drivers side head and one that was on the TBI 5.7 intake next to the thermostat. Of course the new LM7 dosent have a port for the other CTS sensor and I believe my Trans needs that signal correct? Can I just splice the wire to the one hooked up on the head or do I need to tap into the water system somewhere for the 2nd sensor?
    remove the allen head bolt on the rear passenger side head and you can put another sensor there with an adapter fitting

  4. #4
    If he is still using the trans from the truck it will not let the torque converter lockup until the engine reaches a certain temp.

  5. #5
    Join Date
    Sep 2012
    Location
    Quakertown, Pa.
    Posts
    363
    I thought converter lockup was controlled by the PCM. ?????
    '93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!

    New toy: 2001 2500 HD 4X4 Extended Cab Long Bed


    John

  6. #6
    Join Date
    Nov 2011
    Location
    Stuart, FL
    Posts
    78
    I am using the original 4L60E. I have it running but it is stuck in Limp mode. I can't seem to find the purple/wht wire that runs from the old distributor to the ECM, I need to run a tach wire to it. I guess I can order another adaptor for the passenger head. I was hoping not to spend money, but it is worth it being that I have a vigilante lock up converter.
    1994 Silverado 2 door sport side

    Soon to install:
    5.3 LM7, Thumpr Cam, LS6 lifters/springs, LS1 1.7 rockers, 862 heads milled 0.015 and 45 degree cut valves, LS2 timing set, Performer RPM intake, Holley 4150 750cfm carb, MSD 6LS ignition, 2" Primary LT headers 3" X-pipe and two Loudmouth II Mufflers. Vigilante 9.5" 2,800 Stall.

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