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Thread: B5916 base spark closed throttle threshold vs. tps voltage

  1. #1
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    Default B5916 base spark closed throttle threshold vs. tps voltage

    from searching and reading about idle screw adjustments a tps reset will be required, if idle screw adjusments are made.

    also i assume the voltage needs to stay between .4-.6 volts. or am i not understanding?

    does voltage make a differance beside making a mil if tps sensor fails?

    my iac counts are maxed. i have to hold about 7% throttle to make car idle and it likes to see 36-40* to idle more so (smooth) you could say.
    im trying to do all this w/o making the hole in the tb bigger, which will be the last resort if needed.

    what are the limits to the tps reset?

    any comments or questions will be appreciated!

    thanks.
    2004 joe gibbs, rcsb, t-56 6 speed, 4.8l supercharged 10#, cam, bolt-ons, etc
    1987 gnx
    d-21 allis chalmers 3000 hp 504ci on alcohol
    2004 dmax tow pig

  2. #2
    Lifetime Member BLK02WS6's Avatar
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    I don't understand everyone's issue with making the hole bigger... In my opinion, trying to make the IAC motor control large amounts of air doesn't work - if you look at the plunger on the IAC, you will see why I say that. The further it opens, the more surface area is exposed very quickly (due to the pointed shape) and therefore, it can't react quick enough and the result if hunting. Valves like that are meant for fine control within a small range. For that reason, I drill the hole to get the control back in the normal range of the IAC motor. Fine tuning is then possible with the IAC tables...

    And from what I have experienced, yes, opening the blade too far will push you into tables outside of the idle tables - even if you reset it to read 0% - it seems they are based on voltage, not %.

    Just my 2 cents...

    That is an aweful lot of timing for idle - what size cam do you have?
    GM EFI Tuner
    02 WS6 9.41 @ 143 MPH 3675#, drag radials, pump gas, through the mufflers - sold


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    Quote Originally Posted by BLK02WS6 View Post
    I don't understand everyone's issue with making the hole bigger... In my opinion, trying to make the IAC motor control large amounts of air doesn't work - if you look at the plunger on the IAC, you will see why I say that. The further it opens, the more surface area is exposed very quickly (due to the pointed shape) and therefore, it can't react quick enough and the result if hunting. Valves like that are meant for fine control within a small range. For that reason, I drill the hole to get the control back in the normal range of the IAC motor. Fine tuning is then possible with the IAC tables...

    And from what I have experienced, yes, opening the blade too far will push you into tables outside of the idle tables - even if you reset it to read 0% - it seems they are based on voltage, not %.

    Just my 2 cents...

    That is an aweful lot of timing for idle - what size cam do you have?
    I second that, drill the hole and get it done!!!

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    Quote Originally Posted by BLK02WS6 View Post
    I don't understand everyone's issue with making the hole bigger... In my opinion, trying to make the IAC motor control large amounts of air doesn't work - if you look at the plunger on the IAC, you will see why I say that.

    i had to make the hole bigger... not the first time i have... and yes i did port the iac.

    And from what I have experienced, yes, opening the blade too far will push you into tables outside of the idle tables - even if you reset it to read 0% - it seems they are based on voltage, not %.

    Just my 2 cents...


    thought it was based off voltage. did some tinkering and yes they are rather than threshold...


    That is an aweful lot of timing for idle - what size cam do you have?
    its a customer car, and its a .657 .664 244-248 dur @.050 and 110lsa with 106 icl custom grind. and i finally got it to pull 15 in. hg
    2004 joe gibbs, rcsb, t-56 6 speed, 4.8l supercharged 10#, cam, bolt-ons, etc
    1987 gnx
    d-21 allis chalmers 3000 hp 504ci on alcohol
    2004 dmax tow pig

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    You ported the iac? Could you give a description as to why you would do that and how you did that?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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    What engine are you talking about in this thread?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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    Are you getting it to pull 15 in. hg with 36-40 degrees timing?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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    Quote Originally Posted by slows10 View Post
    You ported the iac? Could you give a description as to why you would do that and how you did that?
    just like a cylinder head.....................

    Quote Originally Posted by slows10 View Post
    What engine are you talking about in this thread?
    ls1

    Quote Originally Posted by slows10 View Post
    Are you getting it to pull 15 in. hg with 36-40 degrees timing?
    36 more than 38 engine doesnt like the negative torque
    2004 joe gibbs, rcsb, t-56 6 speed, 4.8l supercharged 10#, cam, bolt-ons, etc
    1987 gnx
    d-21 allis chalmers 3000 hp 504ci on alcohol
    2004 dmax tow pig

  9. #9
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    So you ported the iac versus drilling a hole in the tb? If you did that how are you going to calculate whats needed in the iac tables?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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