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Thread: Cold AFR doesn't follow commanded AFR

  1. #21
    Lifetime Member hquick's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    No, the engine is a 98 454 L-29 and 4L80E trans, I just changed everything to make it work. I wish I could edit those fields so I could put in what the engine/year etc really is. In fact if I change the VIN to the firebird's I loose the PID's.
    You can....I think.
    My VIN used to show as being an Express or Savanna depending on what base tune I used....either that or 'unknown' if I used my correct Vin.
    You can go into the Program files, EFILive, V7.5, Configuration and alter the 'Vin' file to read what you want in your 'VIN' tab in the tune.
    I put my 'correct' numbers in and just added lines to make it read Chevy truck - Australia.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  2. #22
    Joe (Moderator) joecar's Avatar
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    Very nice car, very nice colour.

  3. #23
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    Quote Originally Posted by hquick View Post
    You can....I think.
    My VIN used to show as being an Express or Savanna depending on what base tune I used....either that or 'unknown' if I used my correct Vin.
    You can go into the Program files, EFILive, V7.5, Configuration and alter the 'Vin' file to read what you want in your 'VIN' tab in the tune.
    I put my 'correct' numbers in and just added lines to make it read Chevy truck - Australia.
    When I changed the VIN to the actual firebirds VIN then when I loaded it next it said it couldnt valid the PIDs or something like that so I put the original VIN back in. I think if you put in a valid VIN it would work. I suppose I could mess with it some more...

    Thanks joecar.....

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  4. #24
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    When I changed the VIN to the actual firebirds VIN then when I loaded it next it said it couldnt valid the PIDs or something like that so I put the original VIN back in. I think if you put in a valid VIN it would work. I suppose I could mess with it some more...

    Thanks joecar.....
    the firebird's VIN is probably a different format than the PCM is able to recognize due to its age. my 12200411 PCM recognizes my '96 truck VIN just fine. and I'm able to use all the LSx PID's without an issue.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  5. #25
    Lifetime Member hquick's Avatar
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    What's the firebirds VIN?
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  6. #26
    Lifetime Member waterbug1999's Avatar
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    Mines the same way on on cold start but is like 18.0 then will slowly come down to match the commanded AF once the car gets to ~130F then its pretty close..... Ive tried alot of different things but no luck, so I guess ill just have to call it normal.

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  7. #27
    Lifetime Member mr.prick's Avatar
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    Drop the commanded AFR in the cold ECT areas.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
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  8. #28
    Lifetime Member waterbug1999's Avatar
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    Quote Originally Posted by mr.prick View Post
    Drop the commanded AFR in the cold ECT areas.
    you talking in B3605?

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

  9. #29
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    Question, what is a good target AFR when cold?

    I basically just keep richening it until it stops surging, is this an acceptable practice?

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  10. #30
    Lifetime Member waterbug1999's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    Question, what is a good target AFR when cold?

    I basically just keep richening it until it stops surging, is this an acceptable practice?
    For me, I would like to get it closer to the commanded fuel (B3605).. Its in the 13 A/F range in the table, but its no where near that. So, something else is going on.

    I did load what you sent over by the way, the car didnt like it too much and barely start if not die. I did however use it for comparison and have been trying different things. I think its gotten better so thanks for the help.

    Ive been playing around with the B5934, B5935 and B5936.. My RPMS jump to ~1300 and down to ~400 (upon start up, and gets better after about 10 secs) and the timing jumps all over the place as well.. By reading the descreptions, it sounds like the car was adding too much timing one way, then taking out too much the other way...

    I was told that timing can play a big factor in surging, 25* is ideal for idle, so I have been trying to get that nailed down and its close, better then before. Now I am trying to see what I can adjust to get the AF down to the commanded.

    1999 Trans Am. 10.71 @ 126 - stock bottom end-

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