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Thread: Getting owned by an 87 TBI

  1. #31
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    49
    Posts
    2,946
    I've got an '87 GMC V2500
    Engine is a L05, NA4
    Here is the calibration information:

    BCC= AFBW3542 Scan id= 4401 Part number= 16073539
    Release date= 11/05/86 Engine size= 5.7 Trans Type= Auto trans
    ECM/PCM: ECM #01227747
    Used in trucks: GMC
    Possibly used in:
    R20,2WD,3/4 TON R2500,2WD,3/4 TON R30,2WD,1 TON
    R3500,2WD,1 TON V20,4WD,3/4 TON V2500,4WD,3/4 TON
    V30,4WD,1 TON V3500,4WD,1 TON

    Options:
    With L05 5.7L GAS 8 CYL (5.7K) V8 TBI
    With M40 AUTO 3 SPD TORQUE CONV VAR 1
    With NA5 FEDERAL REQUIREMENTS
    With NA6 ALTITUDE REQUIREMENTS

  2. #32
    Electronic Ignition!
    Join Date
    Oct 2018
    Posts
    13
    I don't want to jinx myself, but let's say the injectors don't help, so then I take the valve cover off, measure rocker lift and find out I have an aftermarket cam? Do I have any options other than tearing the engine apart? Do I need to become really good friends with someone who can burn proms until we find settings that work?

  3. #33
    Administrator
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    May 2011
    Location
    Lakes Region, NH
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    49
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    2,946
    I think you've described the two options. IMO if you find the cam is not stock it might be cheaper and better to put a stock or very mild "computer compatible" cam back in. But if you happen to make friends with a guy that can burn proms, well, even a stock engine can benefit from tuning.

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