Reduced Engine Power Problem

Discussion in 'Performance & Fuel' started by c_m_chance, Mar 4, 2010.

  1. c_m_chance

    c_m_chance Rockstar 100 Posts

    I've had this problem happen a 3 or 4 times now and have no idea what is causing it. Hopefully someone can help me.

    I have a diablo programmer that I use with my truck (2004 Silverado 2500 w/6.0L). I use the diablo tune and have been running 93 octane through it like I'm supposed to with the performance tune. But within the last month or so, I have had a problem when I go WOT. All of a sudden the engine dies!! It will just go down to almost no RPMs and has no acceleration. Each time this has happened the check engine light comes on as well. So I pull over to the side of the road or in a parking lot, park it, and then turn it off.

    After I wait 20 or 30 seconds, I turn it back on and the check engine light will remain on, but the RPMs are running fine and the engine has it's power back. And when I drive it it's fine after that. I then restore the factory tune settings with the handheld and that takes off the check engine light. Then I reinstall the performance tune and it's fine until it happens again.

    Out of the few times it's happened, 2 of the times one the dash it actually displayed "REDUCED ENGINE POWER."

    If anyone has any idea of what I can do to stop this from happening that would be great! And please just help me with this problem. I'm not looking for people to simply tell me "Get a custom tune!" or "Shoulda gone with SCT!" or anything like that. If you have some good helpful knowledge about this problem, then please share!
  2. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    did you have the codes read. it is going into the safe mode for one reason or another. is it at a certain rpm where it shuts down (ie it may be revving higher than the computer believes safe so it goes into safe mode) if thats the case does the diablo have the ability to adjust the rev limiter?
  3. c_m_chance

    c_m_chance Rockstar 100 Posts

    The diablo does allow you to change the rev limiter. I haven't toyed with that part yet though.

    As far as the codes, I have not had a chance to read them. When the check engine light comes back on again, if it does it again, then I can read them.

    I'm not so sure that it has any thing to do with the amount of RPMs though. It won't do it anywhere in the throttle range except for WOT. The diablo does have the ability to allow you to change different settings at various throttle percentages. But I'm not really sure what I should be adjusting.

    The safe mode that you are talking about though, what are typically the reasons that these engines will engage that?
  4. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    Usually things like revving too high, tranny temp too high, engine temp too high. Probably alot of other things too. basically any parameter that the computer sees as being too far outta whack that will cause damage to the powertrain. Hopefully a tech (on the site) can give some better info on that.
  5. c_m_chance

    c_m_chance Rockstar 100 Posts

    Ok. So you think this problem could be fixed by adjusting some of the parameters on the tune that I upload to the computer? I'm not to sure on things that would be safe to change as far as the revving and all that, but I'm sure I could figure it out.
  6. nickpatton_189

    nickpatton_189 Rockstar 100 Posts

    after installing the diablo tune on my truck it says the same thing, wats up with that?
  7. JennaBear

    JennaBear Rockstar 100 Posts

    If you are running into this problem more than once, I would suggest contacting Diablo, and not running the tune until it is sorted out.

    I would definitely get the codes read, as I am sure Diablo would want to know what it is as well. The Reduced Power is merely letting you know that it is a problem related to the electronic throttle control and is thus snapping it shut.
  8. nickpatton_189

    nickpatton_189 Rockstar 100 Posts

    well every time i install the 93 octane tune it says that after im done, but no lights ever come on exepct knock sensor low input or out put, something like that. so is that engine power reduced thing not usual?
  9. JennaBear

    JennaBear Rockstar 100 Posts

    Definitely not normal, and I would not run it like that.
  10. cable734

    cable734 New Member

    as far as the message reduced engine power my hypertech diplays that and so does my friend bully dog power pup

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