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Thread: Resto mod trouble Open loop when ECT going too high lost power

  1. #1

    Resto mod trouble Open loop when ECT going too high lost power

    Corvette 66 with 5.3 and 4l60e on a tci trans tool

    we have a BIG trouble.

    ECT is going crazy and once it reach 268, car switch to openloop and i have ZERO power after

    see log fil at 5:52

    it command 12.99 then i lost everything

    we try unpluging the ECT harness
    we try to make an open loop file and command 14.7 to test it.

    i really need some help...

    700r4 was reaplace w/4l60 and we replace the dash with a digital one.
    so we think a wire or bad ground but we cant find it

    ECT gauge in car is around 210 but the ECT in hptuners is going crazy.
    we made a test with a digital thermometer and the value is around 205

    i just want to eliminate the calibration trouble before going elsewhere

    19-07-21 21-03-58.hpl
    TEST1.hpt

    this is the open loop test we made
    openloop test.hpt
    Last edited by elerico; 3 Weeks Ago at 08:16 AM.

  2. #2
    Advanced Tuner
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    Try setting P0116 & P0128 to No Error Reported.

  3. #3
    Quote Originally Posted by blindsquirrel View Post
    Try setting P0116 & P0128 to No Error Reported.
    Dont have any dtc except map and its already set to no error

  4. #4
    Tuning Addict 5FDP's Avatar
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    Get a new temp sensor if the computer is reading way higher than a temp gun.

    Or you have a horrible air pocket in the drivers side cylinder head right next to the temp sensor.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  5. #5
    Quote Originally Posted by 5FDP View Post
    Get a new temp sensor if the computer is reading way higher than a temp gun.

    Or you have a horrible air pocket in the drivers side cylinder head right next to the temp sensor.

    Ok but why the car switch to openloop and command 12.99 ? At 5:52 in the log

  6. #6
    Tuning Addict 5FDP's Avatar
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    Probably hit some sort of limp code/overtemp protection. 270 degrees is going to melt stuff down if the temp really go that hot and if you had all this installed in a truck with all the CAN-BUS features and cluster working it would be screaming a bunch of stuff at you to shut it off.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  7. #7
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    Those two codes don't have to be set for the tests they run in the background to cause some really weird shit to happen. But I understand how much time and money it would cost you to disable them and write the tune so I guess it's best to go chasing down a bunch of other stuff first, eh?

  8. #8
    Quote Originally Posted by 5FDP View Post
    Probably hit some sort of limp code/overtemp protection. 270 degrees is going to melt stuff down if the temp really go that hot and if you had all this installed in a truck with all the CAN-BUS features and cluster working it would be screaming a bunch of stuff at you to shut it off.
    Enfine never go over 215
    But yes. Look like I hit something and car run in limpmode

  9. #9
    Tuning Addict 5FDP's Avatar
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    I know the engine never really was getting that warm but the computer says it was based on the sensor readings. That is where we think the limp/protection mode is coming from.

    I'd still replace the sensor with a new AC delco unit for good measure, then bleed the cooling system of air the best you can. After that see if the coolant temp through the scanner/computer match with the temp sensor you rigged up.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  10. #10
    Quote Originally Posted by 5FDP View Post
    I know the engine never really was getting that warm but the computer says it was based on the sensor readings. That is where we think the limp/protection mode is coming from.

    I'd still replace the sensor with a new AC delco unit for good measure, then bleed the cooling system of air the best you can. After that see if the coolant temp through the scanner/computer match with the temp sensor you rigged up.

    We already tey a new sensor
    Bleeding the system is the next thing

    Do i have another option if i got the same trouvle after the bleeding ?