L18 8.1L swap resource thread

Discussion in 'The Engine Bay' started by Larry, Jun 14, 2013.

  1. SpeedlabDan

    SpeedlabDan Keepin it trashy never classy Premium Member GMOTM Winner

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    Does the ecm need programed after the throttle body is changed? I have no throttle and it's running worse than before. I'm suspecting it may be the ecm.

    2020-07-31 12.37.29.jpg
     
    Last edited: Jul 31, 2020
  2. Wes Harden

    Wes Harden 1/2 ton status Premium Member

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    it does learn, when the throttle is change adjusted, but it should run decently until throttle minimum air is learned.
     
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  3. ZooMad75

    ZooMad75 #crawlabago Premium Member GMOTM Winner

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    According to the service manual, if the throttle body is replaced no programming is required. It does recommend that you plug in a scan tool to monitor the following:
    1. Connect a scan tool in order to test for proper throttle-opening and throttle-closing range.
    2. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
     
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  4. SpeedlabDan

    SpeedlabDan Keepin it trashy never classy Premium Member GMOTM Winner

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    tac module on order. no throttle right now and same assues as before
     
  5. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    Make sure the TAC module is for the same application as the throttle body. The early throttle bodies with the big round motor use a different TAC module part number and have different drivers in them than the later one like you installed. It’s a pisser you’re having so many issues with this but this is the exact reason why the 8.1 recipe here includes using a cable driven L29 454 throttle body. Plus the pedal feel of the DBW 8.1s feels weird off-road, especially with a manual trans
     
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  6. SpeedlabDan

    SpeedlabDan Keepin it trashy never classy Premium Member GMOTM Winner

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    Sadly, I've pro been chasing these issues due to this the entire time. It has been a long road but at least at this point I know everything except the block at brand new... Here's the part number and application I ordered. It covers a lot of models but should be correct for my application.

    Screenshot_20200801-063950_Firefox.jpg

    Screenshot_20200801-063855_Firefox.jpg
     
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  7. Larry

    Larry 1/2 ton status Premium Member GMOTM Winner Author

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    I added a blurb for oil pump priming at the bottom of Post #24 Page 2
     
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