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Thread: Heat soak effecting Inlet Air Temp sensor and making engine run rich after hot start

  1. #1
    Tuner Force's Avatar
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    Heat soak effecting Inlet Air Temp sensor and making engine run rich after hot start

    As the title says, I am having a minor issue after stopping the engine when hot and restarting after 5 minutes or more, the engine runs rich(about 13.9:1- should be 14.7) for about 45 seconds and then goes back to normal. It seems like heat soak at the iat sensor may be doing this. Is there a table in the E40 tune that I can adjust to change this supposed IAT versus fuel issue? I don't have a scan showing this, but can easily make one. I will attach my tune.

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    BoostedLS2_NEW_TUNE_03 with higher spark change 12.hpt

    This is my tune.(MAF SD) The engine is a LY6 404 cubic inch, Trickflow 225cc cnc heads, With Harrop 2300 PD blower, cam is 226/[email protected]" .600 lift 114LSA. Fuel stoich 14.69. 60lb siemens deka iv injectors @ 4bar. Maf sensor is Ls7 card type in a 100mm intake pipe. ECM is a E40. The reason I think it is heat soak of the IAT sensor is that in a scan the sensor reads high after restarting (around 50C or more) and then goes back to normal 5 -12C within a short time (up to 45 secs). The fueling goes from reading 13.9 to 14.7 in this same time. I will do a scan of this tomorrow night my time and put it up.
    No DTC's are showing.
    Last edited by Force; 07-21-2014 at 11:39 AM.

  3. #3
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    Engine-fuel---- flow rate mult vs IAT..

    On and E38.. just assuming an E 40 has the same table.

    Personally if its just for less than a minute, and starts well, I wouldn't worry about it.
    2007 Corvette C6 Vert. A6
    LME LS402, Pat G custom cam, ATI 10% OD Damper
    Circle D triple disc 2600, 3.42 Diff
    YSI, 3.0 pulley, ID 1000's
    Alky Control Meth,
    ARH 1 7/8 headers,
    1009 RWHP @ 7000, 817 RWT @ 6000

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    Thanks for that. I think I will leave that table alone. My table has 1.000 across the board and is the same as a stock tune.