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Thread: '87 350 TBI, custom application, looking to go bare-bones

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  1. #1
    Fuel Injected! Mrgto68's Avatar
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    Quote Originally Posted by Fast355 View Post
    The A/C on signal is +12VDC off the cycling switch.
    Ok, so If I connected 12v to the AC wire from the ECM, this in theory should then increase the idle?
    If it does, then I could Mcgyver up a "fast idle" switch by running that AC wire to a switch.

    This could solve one of the problems.. Thanks for the info!

  2. #2
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    Quote Originally Posted by Mrgto68 View Post
    Ok, so If I connected 12v to the AC wire from the ECM, this in theory should then increase the idle?
    If it does, then I could Mcgyver up a "fast idle" switch by running that AC wire to a switch.

    This could solve one of the problems.. Thanks for the info!
    Hello, i fear you have to set rpm manualy by a choke.
    I opened AHWZ.bin ( you can find it here on the forum) with the $42.xdf
    Wenn looking to scalars I found that there is no acceleration for A/C.
    Off course can you give the eprom to s.b. here on the forum to change this setting!
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    Fuel Injected! PlayingWithTBI's Avatar
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    Hello, i fear you have to set rpm manualy by a choke.
    I opened AHWZ.bin ( you can find it here on the forum) with the $42.xdf
    Wenn looking to scalars I found that there is no acceleration for A/C.
    I have bin AMUS for my 7747 ECM, it has IAC RPM added to Desired Idle with A/C on in Scalars, read the comment for setting this.
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    Last edited by PlayingWithTBI; 02-19-2019 at 09:23 PM.

  4. #4
    Fuel Injected! Mrgto68's Avatar
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    Quote Originally Posted by PlayingWithTBI View Post
    I have bin AMUS for my 7747 ECM, it has IAC RPM added to Desired Idle with A/C on in Scalars, read the comment for setting this.
    I sent you a private message. Would love to see if I can get my rig set up with this.

  5. #5
    Fuel Injected! Mrgto68's Avatar
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    Quote Originally Posted by mecanicus View Post
    Hello, i fear you have to set rpm manualy by a choke.
    I opened AHWZ.bin ( you can find it here on the forum) with the $42.xdf
    Wenn looking to scalars I found that there is no acceleration for A/C.
    Off course can you give the eprom to s.b. here on the forum to change this setting!
    Thank you for looking into this for me. S.B.? is that a member on the forum?

  6. #6
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    " S.B.? is that a member on the forum? "
    a lot of them : somebody . lol

  7. #7
    Fuel Injected! Mrgto68's Avatar
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    Ok, well it took a little while, but I was able to clean up and remove a lot of the old wiring in the engine compartment that had nothing to do engine operation. I installed the heated O2 Sensor and most of the sensors that weren't attached.

    I was able to take the rig for a test drive and data logged the journey. Hitting max speed (25mph) the fastest the rig would ever travel. 5 mph is average.

    Dave W, thank you for the original bits of info, it looks like shes running closed loop now and not running as rich! I'm still having some low end power issues, which I believe is the transmission not shifting down as she sounds like it's bogging down just to get up short inclines.


    3-16-2018a is from first firing up the rig and heading up the driveway
    3-16-2019b is the full drive session.

    DaveW do you think you can glance these over and let me know your thoughts?

    -Mike
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  8. #8
    Super Moderator dave w's Avatar
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    Quote Originally Posted by Mrgto68 View Post
    Ok, well it took a little while, but I was able to clean up and remove a lot of the old wiring in the engine compartment that had nothing to do engine operation. I installed the heated O2 Sensor and most of the sensors that weren't attached.

    I was able to take the rig for a test drive and data logged the journey. Hitting max speed (25mph) the fastest the rig would ever travel. 5 mph is average.

    Dave W, thank you for the original bits of info, it looks like shes running closed loop now and not running as rich! I'm still having some low end power issues, which I believe is the transmission not shifting down as she sounds like it's bogging down just to get up short inclines.


    3-16-2018a is from first firing up the rig and heading up the driveway
    3-16-2019b is the full drive session.

    DaveW do you think you can glance these over and let me know your thoughts?

    -Mike
    The chip does not have the Spark Advance (SA) *Hack*or Injector Base Pulse Width (PWM) *Hack* applied. SA & PWM is very useful data! I recommend installing a custom chip with the SA & BPW *HACKS*.

    Knock Counts are excessively high! I'm wondering about the Knock Sensor, ESC Module, and related wiring. Not knowing SA is limiting the understanding of Knock Counts.

    The BLM's are sometimes ZERO, which I don't think I've ever seen that before. Not knowing BPW is limiting the understanding of the ZERO BLM's.

    The data log show MPH, sometimes 100 MPH? I wonder about the VSS wiring?

    dave w

  9. #9
    Fuel Injected! Mrgto68's Avatar
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    Hey Dave, absolutely appreciate your input and help!! Thank you.

    I'm going to do some research on the forums and read up on the SA *Hack* and the PWM *Hack* this is new to me. As per your recommendation, where would I find and how much would I be looking to spend on a custom chip?

    I'm going to head back out to the shop and take a look at the knock sensor, esc module wiring.

    I purchased and installed the 2PRS Speed sensor from JTS and wired it directly to the VSS sensor wire to the ECU.

    I don't have the Automatic P / N wired up, I assume that's why it reads that it's always in drive. Would this be an issue to leave disconnected?

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