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Thread: 97 camaro lt1 obd2 to obd1 conversion

  1. #1
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    97 camaro lt1 obd2 to obd1 conversion

    I have a 97 camaro lt1 that wanna do a obd2 to obd1 conversion on . can any one point me to the right path and whats needed

  2. #2
    Super Moderator dave w's Avatar
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    Quote Originally Posted by 71-nova-lt1 View Post
    I have a 97 camaro lt1 that wanna do a obd2 to obd1 conversion on . can any one point me to the right path and whats needed
    I would re-pin the LT1 OBD2 computer connectors to an LT1 OBD1 computer. Good information here: http://www.gearhead-efi.com/Fuel-Inj...rmation-EE-EEB

    The vast majority of the pins are the same between the LT1 OBD2 vs. LT1 OBD1. The LT1 OBD2 has two additional O2 sensors, and a crank position sensor not used in the LT1 OBD1 system.

    dave w
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    Last edited by dave w; 01-19-2014 at 11:37 AM.

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    EFI GearHead ! EagleMark's Avatar
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    The swap to OBDI will plug right in. The only extra wires to PCM, which I did not remove are the Crank Position Sensor and rear O2 sensors.

    You also need to change Knock Sensor or sensors to the earlier OBDI as they are different resistance. I've read but never done... that you can add a resistor to the wire?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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    Fuel Injected! steveo's Avatar
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    yeah, it's just a matter of pluggin the new ecm in and running an earlier knock sensor. i've done this a lot, my current daily driver included.

    be sure to run a '95 bin instead of a '94 if you're using the original 4l60e trans.

    the resistor does work just fine, i did use it once, but i don't trust it, i'd swap the knock sensor out.

    eaglemark missed one extra set of wires you can yank out - the flow sensor for the EVAP system (OBD-I doesnt use that shit either)

  5. #5
    No need to change anything
    Just plug the OBD-I computer and turn off the knock sensor code. I have done a few and they work good, the knock sensor works normal.
    If you want, you can do the resistor mod to the PCM instead, both ways work good. No need to change knock sensors

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    Really sweet any one have a obd1 ECM trade for my obd2 one

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    O. And I wanna tune it with tuner pro. I made a uber easy cable to work with obd1 but it's got a obd2 port how do I wire it

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    Fuel Injected! steveo's Avatar
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    no dumbass would make that trade; an obd-i ecm goes for about $100, just buy one

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    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by 71-nova-lt1 View Post
    O. And I wanna tune it with tuner pro. I made a uber easy cable to work with obd1 but it's got a obd2 port how do I wire it
    Get an OBDI ALDL port and swap the wires over. Check this page for wiring.

    http://www.aldlcable.com/

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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    Hey it was worth a shot there some body that would

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    Fuel Injected! steveo's Avatar
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    or this, in the meantime:

    http://shbox.com/1/xraycable.jpg

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    I guess I'm the only one ever to like the obd2 pcm in the LT1? Its a faster processor... OBD2 diagnostics.... Worth tuning..

    Chris

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    Super Moderator dave w's Avatar
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    Quote Originally Posted by Rocko350 View Post
    I guess I'm the only one ever to like the obd2 pcm in the LT1? Its a faster processor... OBD2 diagnostics.... Worth tuning..

    Chris
    Many people like the OBD2 LT1 computer. The extreme downside to the LT1 OBD2 computer is cost, cost and more costs are involved to use it. Which low cost / no cost tuning software can be used with the OBD2 LT1 computer? What low cost / no cost flashing software / hardware can be used with the OBD2 LT1 computer.

    For most OBD1 LT1 owners, the price of TunerPro RT and TunerCats WinFlash are well within the budget!

    dave w

  14. #14
    Fuel Injected! steveo's Avatar
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    its even more poorly documented and researched than the obd-I ecm. *that's* why it sucks to tune. its not just cost. unless things have changed...

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    That's the only reason I'm doing it is the cost. Is there a cheap way to tune a obd2

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