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Bump Stop Mod Question

This is a discussion on Bump Stop Mod Question within the External Engine forums, part of the LSx Technical Help Section category; I know if I am doing this I should use a scanner to see what percentage the throttle is open ...

  1. #1
    CrapMaster samson_420's Avatar
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    Bump Stop Mod Question

    I know if I am doing this I should use a scanner to see what percentage the throttle is open to. But, I don't have a scanner. Can I just eye ball it? Or use a Volt meter. . . . .

  2. #2
    MOTOR CITY MARO' SSTODD's Avatar
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    I would not "eyeball it" if you are wrong the damage cannot be undone and it will send the error code.

  3. #3
    Senior Member Danger731's Avatar
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    It can be undone by threading it, then re adj. back fwd w a screw. Seen it done.

    Actually some just shave it, drill , thread it, then adj w the screw to get it nats ass 89.5 degrees. I wouldn't eye ball it btw.
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    old timer blue02Z's Avatar
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    mark shaner eyeballs it

  5. #5
    CrapMaster samson_420's Avatar
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    Can I use Volt meter somehow?

  6. #6
    Impounded
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    Quote Originally Posted by samson_420 View Post
    Can I use Volt meter somehow?
    I dont think so.

  7. #7
    old timer blue02Z's Avatar
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    i dunno, when i went to mark's house i asked him about it and he said he never used it, just as long as you dont over do it

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    Quote Originally Posted by samson_420 View Post
    Can I use Volt meter somehow?
    Yes, that is how the TPS is checked for position and to determine if the signal remains linear through its travel. This is a 5 volt signal that is modified by resistance. The closer to the maximum travel the lower the resistance. I'm sure you already know the maximum voltage signal for WOT. BTW, mine was correct without the mod.

  9. #9
    used and abused at wot ibanez7's Avatar
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    Quote Originally Posted by samson_420 View Post
    Can I use Volt meter somehow?


    YES YOU CAN!!!!


    Make sure the volt meter does not go past 4.6 volts. most cars before the bumpstop mod read 3.3 - 3.9.

    4.6 volts is right under 90 degrees open. Anything more will set off a SES light

    connect the positive end of the voltmeter to the TPS and the negative end to the negative battery terminal for ground.

  10. #10
    Impounded
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    I stand corrected lol

  11. #11
    Member ApexVIII's Avatar
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    Quote Originally Posted by ibanez7 View Post


    YES YOU CAN!!!!


    Make sure the volt meter does not go past 4.6 volts. most cars before the bumpstop mod read 3.3 - 3.9.

    4.6 volts is right under 90 degrees open. Anything more will set off a SES light

    connect the positive end of the voltmeter to the TPS and the negative end to the negative battery terminal for ground.
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  12. #12
    Impounded
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    Any pics on the idea of an adjuster screw for the bump stop>?

  13. #13
    Member Pntbll309's Avatar
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    Drill a hole in the bump stop, thread it and put a screw towards the plate that opens the butterfly, then you can thread the screw in or out to adjust how far the TB will open.

  14. #14
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Any pics of it tho>?? I thought about doing this... that way if i let my g/f ever drive my car i can crank it all the way out.. lol

  15. #15
    M6 King Hot Black Trans-Am's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    Any pics of it tho>?? I thought about doing this... that way if i let my g/f ever drive my car i can crank it all the way out.. lol

    Good idea! I'm happy mine doesn't drive a manual.

  16. #16
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    I told her as soon as she gets her license I would like her drive it.. my mistake.. a guy a couple of miles from me is going to do the bump stop mod for me and P&P..

    I could always do the set screw anytime tho

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