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98 injectors work on a 99ls1?

This is a discussion on 98 injectors work on a 99ls1? within the External Engine forums, part of the LSx Technical Help Section category; Have a 99 ls1, 98PCM and a painless wiring harness.. Everything is working fine, I'm even getting juice to the ...

  1. #1
    Impounded LS1 Trans am's Avatar
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    97 LT1 trans am

    98 injectors work on a 99ls1?

    Have a 99 ls1, 98PCM and a painless wiring harness.. Everything is working fine, I'm even getting juice to the injectors. But they arn't opening or something. They have the numbers (12554271 0 280 155 752) I'm guessing off a 98 ls1? The injectors came off a 97 corvette Will this work on my 99ls1 and 98pcm? Or does it have to be tuned for them specifically..

    Thanks
    Robert
    Last edited by LS1 Trans am; 11-15-2006 at 07:42 PM.

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    Life in the Fast lane sunsetorangess's Avatar
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    Ok so the motor is from a 99 correct? The injectors "intake" are from a 98.. correct? If the intake was complete then the injectors should work. Although they did come with different injectors, 98 and 99 models. What is the car doing? Just cranks and no start?
    J
    2001 SS, Its not the car its the Driver that matters....

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    Impounded LS1 Trans am's Avatar
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    97 LT1 trans am

    Correction: The Injectors came off a 1997 Corvette, they weren't off the intake I have. And yes, I have a spark, but no fire from the injectors, I can use starting fluid and it'll fire up for a min.

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    Life in the Fast lane sunsetorangess's Avatar
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    Did you check the pressure at the rail?
    J

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    97 LT1 trans am

    Don't have anything to do that I don't think.. Anything around my garage I might be able to test that with? Any help thanks

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    Life in the Fast lane sunsetorangess's Avatar
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    well a pressure guage works great and they run under 20 bucks and thats your best bet but you can try, pullin the cap off the end of the fuel rail and have someone crank it and see if your dry or pullin some fuel..
    J

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    Impounded LS1 Trans am's Avatar
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    97 LT1 trans am

    I know it's pumping fuel, I've taken a injector off and put a jar under the hole and had fuel pump right out.. With force.. I'll find out tonight for sure if the injectors are the problem or not.

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    97 LT1 trans am

    The injectors arn't the problem.. Must be either fuel pressure or computer..

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    97 LT1 trans am

    Getting a pressure guage, I know both wires that run to the injectors are hot when the motor is on, i'm thinking that maybe the computer will need to be tuned for these injectors. Any suggestions on ideas to try?

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    I went to Playboy Mansion FantaZGuy28's Avatar
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    98 injectors are 26LB and 99-00 are 28LB injectors.

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    Senior Member mrr23's Avatar
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    nope
    97-98, 01-02 are 28#
    99-00 are 26#

    the car will run with the injectors you have. the 98 PCM is set for 28# injectors. it might be a crank and /or cam sensor issue.

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    97 LT1 trans am

    Well, i'm still not sure if It was my fuel pump, that's why I'm getting a pressure guage and then I'll hook a electric fuel pump up.. BTW does anyone know where I could get a fuel pump that will work for my ls1 when I put it in a truck.. I don't think a dodge ram 50 has a big enough fuel pump? Let me know.

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    Quote Originally Posted by FantaZGuy28 View Post
    98 injectors are 26LB and 99-00 are 28LB injectors.

    Exact opposite.... '98 has 28 lb, '99-'00 has 26 lb, and '01-'02 has 28 lb.

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    97 LT1 trans am

    Ok, hooked the fuel guage up and ran a hose from my 99 trans am(working fuel pump and everyting) to the inlet on my fuel rail on my stand alone motor and put the fuel guage on the rails and it's getting around 60PSI to the guage and cranked and cranked, but nothing yet.. maybe I need a tune-up on the computer for these injectors specifically? Or maybe I'm not getting all the wires hooked up on my wiring harness to the computer? Anyone know much about what wires hook up where? Or maybe how to test them.

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    Senior Member mrr23's Avatar
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    dark bowling green
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    if you have pressure, then the injectors aren't firing. i've said it once, the 28# injectors are what was used with the 98 PCM. what you need to do is hook a scanner to the diagnostic port and see if the PCM is even trying to fire off the injectors. look to see if there is and pulse width movement going on.

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    97 LT1 trans am

    Anywhere I can test with a ohm meter to see if those wires are hot? I know the 2 wires that go into the injectors are hot when I turn the key on..

  17. #17
    Senior Member mrr23's Avatar
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    they sell a noid light tester for injector wiring.

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