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Thread: Does the ECM neccessarily need the signal?

  1. #11
    Join Date
    Aug 2011
    Location
    Galveston, Texas
    Posts
    225
    Well. Yeah that's what I heard and though too. I got my ECM tuned from Nelson. but it doesn't. runs like crap when the AC is on. So.. Im wondering if I pigtail a wire off the clutch positive to the AC request pin on the red ECM connector that might solve the issue? No idea. but I ordered 25 pins today to give it a shot. Cant hurt?
    1992 Full size blazer 5.3 Swap successful.
    http://www.ls1truck.com/forums/lsx-t...zer-build.html
    Galveston, Texas

  2. #12
    Join Date
    Mar 2012
    Posts
    129
    Good luck! If u have good results let me know! Cuz I don't want my fresh 5.3 to he a turd when the AC is on!! Nor do I want to suffer in this ridiculous Virginia humidity!!!

  3. #13
    Join Date
    May 2010
    Location
    Galveston, Tx
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    678
    Quote Originally Posted by Clayman View Post
    Nor do I want to suffer in this ridiculous Virginia humidity!!!
    I don't want to hear anyone complain about humidity

    95 C1500 LM7, built 4L60e, Circle D 3200, LT's, Nelson tune, open differential, 3.42, and LS1 e-fans. Tractionless

  4. #14
    Join Date
    Mar 2012
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    129
    Quote Originally Posted by silverado_lover View Post
    I don't want to hear anyone complain about humidity
    Haha va is pretty bad may-September!!! Where are u comin from?

  5. #15
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,441
    If you were using a 99-02 PCM you could give the PCM control of the AC clutch circuit through a relay and use your HVAC controller to provide a request from the PCM.
    The 2005 PCM requires a serial request for HVAC functions though. Been asking HPtuners to provide a setting for the 03+ controllers for awhile. As far as I know nothing has been done so far. I haven't been keeping up with it for the past few months though.

  6. #16
    Join Date
    May 2010
    Location
    Galveston, Tx
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    678
    Quote Originally Posted by Clayman View Post
    Haha va is pretty bad may-September!!! Where are u comin from?


    Currently at 83% humidity...and I don't have my A/C lines made yet

    95 C1500 LM7, built 4L60e, Circle D 3200, LT's, Nelson tune, open differential, 3.42, and LS1 e-fans. Tractionless

  7. #17
    Join Date
    Aug 2011
    Location
    Galveston, Texas
    Posts
    225
    Quote Originally Posted by silverado_lover View Post
    I don't want to hear anyone complain about humidity
    I second that. Were miles apart. Its HELLA hot. And the LS even though runs like a champ with no AC runs like a POS with it on. So it really needs to be addressed. I am running a drive by cable setup. Nelson provided the ECM. Does this mean its the kind I can work with?
    1992 Full size blazer 5.3 Swap successful.
    http://www.ls1truck.com/forums/lsx-t...zer-build.html
    Galveston, Texas

  8. #18
    Join Date
    May 2010
    Location
    Galveston, Tx
    Posts
    678
    Maybe you could some how splice into the e fan wire that tells the fans when the AC is turned on and run the wire from it to the PCM for it to bump idle up?

    95 C1500 LM7, built 4L60e, Circle D 3200, LT's, Nelson tune, open differential, 3.42, and LS1 e-fans. Tractionless

  9. #19
    Join Date
    Mar 2012
    Posts
    129
    Today in roanoke it was 87+/- with about 85% humidity so I feel your pain!!! Im using my old AC lines so I should be good whenever I get the thing running

  10. #20
    Join Date
    Jan 2012
    Posts
    229
    Quote Originally Posted by silverado_lover View Post
    Maybe you could some how splice into the e fan wire that tells the fans when the AC is turned on and run the wire from it to the PCM for it to bump idle up?

    Maybe splice into the clutch circuit and take that to pcm?

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