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Thread: Reduced Engine Power mode help

  1. #11
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    Here is the tune file for the truck in question, REP mode.tun.

    First off, fix the out of range cells. B6615-B6620 are all out of range when opened. Tunes can do weird things when values are out of range.

    P0068 is a rationality test for the ETC that is triggered when the airflow is above what the PCM expects. You shouldnt have to disable the test, but it might work. You've already tried to take the TPS out of the equation, cant hurt to disable this code too. Just be careful, this controls the throttle in case of a runaway situation, if it starts revving with no throttle input shift to N and kill the key.

    You are getting P0102 and P0106 because you havent turned off the codes in the Diags section. P0102 is a MAF-related code, I think all of them need to be disabled to really kill the MAF.

    Have you adjusted C6102? Might need some work, if the PCM sees more airflow that what it expects it will throw a REP code.

    Do you need to adjust C3004 Predicted MAP Min? What about C3906 and C3907, those are TPS related tables.

    I have adjusted the DTCs according to the EFILive COS tutorial and fixed the OOR values, it is REP Mode_0001.tun.

    What is up with your B3647 Commanded Fuel table? You're commanding 14.7 at ALL RPMS until 95kpa. Probably not a good thing...

    Also I just remembered there are ETC tables in the tune that are activated ONLY when you have your FlashScan plugged in. Plug in your V1/V2 and open the tune file. Look under Engine->Electronic Throttle (red folder) at the tables in there. Under the parameters section there are a few cells for idle TPS adjustment... And B2307, B2308 might need to be adjusted to eliminate your REP. Dont know what max TPS should be, but currently it's set at 98.8%, can go to 100% if need be.
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    Last edited by ScarabEpic22; November 10th, 2011 at 01:57 PM.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  2. #12
    Senior Member JUSTASBC's Avatar
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    B6615-B6620 was set that way by my original tuner. I will try changing that and see if it helps.

    I have disabled P0068, and I get the same REP results, except the DTC doesnt show up when I check my codes.

    I thought I disabled P0102, and P0106, but must not have done it properly. I didn't realize they were under the tranny too.

    I have tried messing with C6102, but with no luck. Maybe I will have better luck with the other things I am changing.

    I have changed C3004, but will try again.

    I have adjusted C3906, and C3907, but will try again.

    B3647 was set that way by my original tuner. From what I assume it will only use the STFT's when it is set to 1.00. It is at .99, and should be unactive. I am rtunning in straight OLSD now.

    Thanks Erik, I will see if this helps. I will let you know. I don't have too many good days of tuning left. It ,might have to wait till next year.

  3. #13
    Lifetime Member driver456's Avatar
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    Not sure if you are still having problems,Change B2706 to 2.8,B2713 to 18 and change B2717 to .254 Those are the Electronic Throttle tables,Let me know if that cures your REP................Paul

  4. #14
    Senior Member JUSTASBC's Avatar
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    Paul,

    I think I might have gotten it straightened out. I ended up putting my 87mm truck TB back on it, messed with the tune a bit, and have not had a problem (knock on wood). This is a summer only vehicle, so it will be a few more months before I can try your suggestions. I will try them in the spring and let you know. Thanks for your help.

  5. #15
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    Hello. I'm using the x-Link to with no problems. Did you terminate the X-Link properly?
    Chris.

  6. #16
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    Quote Originally Posted by chris10an View Post
    Hello. I'm using the x-Link to with no problems. Did you terminate the X-Link properly?
    Chris.
    Say again...!?!?

  7. #17
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    Default Car style LS2/LS7 (e.g. Corvette)

    Car style LS2/LS7 (e.g. Corvette) 90mm throttle body- The loops should be cut and the ends insulated to prevent contact.

    I'm not a specialist in this, maiby i answered wrong here..... i did not read it all...
    In that case sorry.. But this is the way we use them in Norway, with no problems. The X-Link..
    Chris..
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  8. #18
    Senior Member JUSTASBC's Avatar
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    I am still having problems with REP mode. I have tried all the suggestions. I currently do not go into REP mode idling, but I get it at WOT. I have a new LS7 throttle body on it now, and it trips every time I go WOT. Does anyone have any suggestions? Thanks. Would it help anyone if they viewed my tune or a log? I am getting P0102 on a COS SD tune.

  9. #19
    Lifetime Member driver456's Avatar
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    What code are you getting now when you go into REP mode.P0102 code,Aren't you suppose to get that code on a SD tune?

  10. #20
    Senior Member JUSTASBC's Avatar
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    Well I was advised it could be the throttle body. I am not getting any codes that would put it in REP mode. I ended up swapping to an 87mm truck throttle body, and it hasn't went into REP mode yet. I think that the air passing the blade is actually forcing it closed making it go into REP. I turned the key on with engine off, and went WOT. I then forced the blade closed with my hand and it went into REP just as if I was driving it. I am really surprised at the amount of force it took to make it go into REP. When I took a log while driving, you can see the TP% lowering right before REP mode. I am putting a 10% overdrive crank pulley on it tomorrow, so I guess we will see if too much air will effect the 87mm TB too. I will update this post with the results.

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