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Thread: 98 Grand Prix Engine wiring diagram

  1. #1
    The Pink Car 3400-95-Modified's Avatar
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    98 Grand Prix Engine wiring diagram

    Looking for a 1998 Grand Prix wiring diagram, Engine diagram or complete car diagram will do... I really just need to compare ECM pinouts and the physical engine circuits. So I can see if I could possibly wire in a 98 ECM to gain more engine controls for a tuning aspect.

    "Engine Performance" section of the system wiring diagrams would be ok... as noted I really just need to see the circuit layouts to compare and definitely be able to see the pinouts of the Blue and Clear connectors.
    Last edited by 3400-95-Modified; 03-20-2007 at 05:42 PM.

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  3. #2
    Kaiō-ken X 10 blackbombshell95's Avatar
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    I hear the 98/99 monte carlo/lumina harness is the best swap if your original engine/trans was a 3100/4t60e.

    I have my spare 95 3100/4t60e wiring harness already spliced upto a 98 lumina harness plus the lumina pcm. BT racing did it for me. Check out the forum on www.motorswap.org
    Corey's 95 GP - Engine/Trans installed
    02 GTP - 90* > Failboat
    www.blackbombshell95.com

  4. #3
    The Pink Car 3400-95-Modified's Avatar
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    I'm not swapping harnesses again.... I just want to re-pin the ECM plugs if possible and use the newer 98 ECM... that’s why I need wiring diagrams for the best donor...

    Bottom line I want a 98 3100/4t60e combo car wiring diagram so I can compare circuits.

    I figure if I go with 98 then it is less likely to have all the new BCM controls and hud stuff and whatnot.
    Last edited by 3400-95-Modified; 03-23-2007 at 03:43 PM.

    Got Lope?
    3500/3400 Hybrid, Custom Cam 216/240 .050 dur .517/.568 lift 112LSA
    Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Modified headers.
    Stage-1 Raybestos/Alto 4t60e, 3600 RevMax Converter, EP LSD, 3.69FDR
    12.67@107.43 Chevy Fest, Epping NH Oct 2010 Nitrous 100shot
    2007 Legacy GT Limited 5-speed 3" Turbo Back, Stage 2 - 255whp/310wtq

  5. #4
    I know this is late, but I have a complete 1999 Grand Prix wiring diagram.

    Is that something you can use? I should warn you. It SEEMS to be sound as far as the engine goes, but a lot of it is marked PROTOTYPE.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  6. #5
    I have '98 Lumina PCM pinout diagrams at home. I'll have to scan them though, and my only scanner is at work. So I can have them up for you on monday if you still need them.

    This is something I was planning on doing too, but there are a few issues to deal with. first thing that comes to mind is the '98+ uses a pressure sensor for the fuel tank, and the PCM uses that reading to determine when to open up the EVAP purge solenoid. I don't really think there's much more to deal with, other than every PCM pinout being different.
    Brian

    '95 Cutlass Supreme- "The Rig"
    3400 SFI V6, 4T60e
    Comp Cam grind, LS6 valve springs, OBD2 swap, Tuned
    2.5" DP/ 2.5" dual exh/ Magnaflow Cat/ crap mufflers/ 3500 Intake manifold/ 65mm TB
    TGP steering Rack/ 34mm Sway Bar/Vert STB/ KYB GR2's

    '08 Chevy Trailblazer SWB 1LT "Smart Package"- LH6 5.3L V8/4L60e, A4WD

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