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Does a 98 PCM work with a 99 Engine!

This is a discussion on Does a 98 PCM work with a 99 Engine! within the Computer & Tuning forums, part of the LSx Technical Help Section category; When I bought my car, ( 98 Z28 ) it came with an engine out of a 1999 Z28. Heres ...

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Does a 98 PCM work with a 99 Engine!

    When I bought my car, ( 98 Z28 ) it came with an engine out of a 1999 Z28.
    Heres what I don't understand. The (98)PCM is set up for 28lb. injectors, but the (99) engine comes with 26lb. injectors. How is this making my engine run? Theres no check engine on. Would they have had to tune it? What difference does it make with them being 28lb. and 26lb. ? How can I tell the difference between?

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
    1998 camaro ss vert

    nope they are different.

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
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    that small of an amount on the injectors wouldn't matter, or even really be to noticable.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by 1fastcamarosss11 View Post
    nope they are different.
    What is different?

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
    1998 camaro ss vert

    Quote Originally Posted by 9t8z28 View Post
    What is different?
    from what i have read, in 98 the pcm can go either auto or m6, 99- 02 has to have one or the other. hence m6 pcm with m6 trans.
    but i also read recently that there is an adaptor for that. someone will clear this up i'm sure.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by 1fastcamarosss11 View Post
    that small of an amount on the injectors wouldn't matter, or even really be to noticable.
    Why then, did GM change the injector size?

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
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    Quote Originally Posted by 9t8z28 View Post
    Why then, did GM change the injector size?
    probably because it was cheaper and that little bit didn't effect much.

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    Mrs.'s Boobies
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    The 1998 ECM will only work on a 1998 Engine Harness, it has nothing to do with the engine. The previous owner possibly swapped the injectors from the 1998 car to the 1999 engine.

    Also a 1998 PCM will work on a manual or auto, it is in the prgram and can be flashed to either. Same thing with a 1999-2002 PCM ... you can use them on either auto or manual, it is just a simple reflash for the proper trans.

    Basically, don't worry about.
    George P. Lara
    Mine 2001 Camaro SS #0391: FQuick Garage
    Mrs.'s 2002 Camaro SS #7072: FQuick Garage

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    Im gonna do tune, I need engine control only .
    Does it matter which car computer comes, if its gonna be reprogrammed? Supposing that, harness is fixt for given sensors.

    Do all ls1 ecm:s have same internals, or is there more differences than programs?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Well, from what I have heard, the 98 PCM is the worst one!

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
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    Quote Originally Posted by 9t8z28 View Post
    Well, from what I have heard, the 98 PCM is the worst one!
    just hardest to tune.

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    Quote Originally Posted by 1fastcamarosss11 View Post
    just hardest to tune.
    What do you mean by that? What will be the difference in tuning my 98 PCM compared to a 99> PCM?

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
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    Quote Originally Posted by 9t8z28 View Post
    What do you mean by that? What will be the difference in tuning my 98 PCM compared to a 99> PCM?
    tuner say it is harder to tune the 98's, and some charge more.

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    Is it posible to convert my car to a 99 PCM? What would it take?

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    your parts guy!!! 1fastcamarosss11's Avatar
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    trans am 00 ws6
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    Quote Originally Posted by 9t8z28 View Post
    Is it posible to convert my car to a 99 PCM? What would it take?
    i would guess just wiring, check the tech section here i think someone has done it but i can't remember.

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    Quote Originally Posted by 1fastcamarosss11 View Post
    i would guess just wiring, check the tech section here i think someone has done it but i can't remember.
    Thanks man! You've been a big help!

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    If I had to guess why the injectors are slightly larger it is probably due to the slightly larger cam in the 98.

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    Quote Originally Posted by 1fastcamarosss11 View Post
    tuner say it is harder to tune the 98's, and some charge more.
    I would not go to a tuner that says that. Tuning a 1998 ECM is no different then a 1999+. Many of the fastest cars were running OEM 1998 computers back in the day. I do not charge extra for a 1998, because they are not harder to tune. Granted, there are some tables that are not available to 1998 as there are to 1999+, but you can still tune the idle, part throttle and WOT just that same and with great results.

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    Allright. The next step is to find someone good to tune my car on the EastCoast. Bolt-ons exc.exc. Anybody know of a good tuner near Philadelphia?

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    Quote Originally Posted by 12secSS View Post
    I would not go to a tuner that says that. Tuning a 1998 ECM is no different then a 1999+. Many of the fastest cars were running OEM 1998 computers back in the day. I do not charge extra for a 1998, because they are not harder to tune. Granted, there are some tables that are not available to 1998 as there are to 1999+, but you can still tune the idle, part throttle and WOT just that same and with great results.
    Finally someone who knows what they're talking about, from experience, regarding the 98 PCM. Thanks for the input.

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