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Thread: 7.4L- 0411ecm - WAY! TOO RICH AT CRANKING

  1. #11
    Joe (Moderator) joecar's Avatar
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    Robby, are IAT and ECT showing sensible values...?

  2. #12
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    Quote Originally Posted by joecar View Post
    Robby, are IAT and ECT showing sensible values...?
    They are within sensible range while logging going down the road.... haven't looked at it "not running" but key on yet though.

    I will attach my last log file from tonight below.

    In the last tune posted on here I leaned the cranking ve table 20% more and it didn't seem to change anything... I bought a new fuel pressure guage... I might see if the fuel pressure is staying up while key is off of see how long it takes to bleed off. Are I might see if I can "open" up the iac more to allow more air in to it during cranking to see if that helps if I can figure out how to do that. The tables were previously set up for a 350 in a van so maybe there is a airflow table or count(s) for the iac where its not allowing in enough air?
    Just brainstorming I guess.
    Attached Files Attached Files

  3. #13
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    Try my tune just for kicks, I'm sure it will need a lot of changes but for now adjust the B4001 and B0101 to match yours and give it a try. Mine is a 98 454 with holley throttle body running CLSD mode.

    I looked at your log and to me the IAC is too high at 133 at idle so I would open your throttle blade to get it down to 30-40 at idle(you must do this with my tune). Also, it looks like your timing is pretty low. I'm not sure what cam you have. Also there are some errors that need to be fixed.

    I just noticed your B3647 is out of whack too.

    I dont see any wideband O2 PID in your log, what are you using?

    Lee
    Attached Files Attached Files
    Last edited by LS1_Dragster; October 22nd, 2009 at 08:58 AM.

    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. #14
    Lifetime Member hquick's Avatar
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    Robby....I don't see your commanded fuelling change from 14.68 (stoich) throughout that entire log..even at high KPA WOT ????

    EDIT: Logging too many channels also Rob. (27). Try and knock it down to 24 or less.
    Last edited by hquick; October 22nd, 2009 at 02:45 PM.
    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

  5. #15
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    Yup, B3647 is not setup correctly.....

    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

  6. #16
    Lifetime Member hquick's Avatar
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    PE {B3601} is set to stoich (14.68) across the board. Any reason for this?
    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

  7. #17
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    You need to set that to stoich so that it will run semi-open loop, then the commanded fuel is done with B3647

    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

  8. #18
    Lifetime Member hquick's Avatar
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    Really....I never knew that.
    I thought you just set the areas in the B3647 to stoich...that you want to run in SOL.
    Even when looking at the log and comparing with the tune....when he's hitting cells in the commanded table les than 14.68...his log is still saying 14.68.
    Am I missing something? At 99Kpa and 100% TPS I wouldn't think stoich was a good idea?
    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

  9. #19
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    Your not missing anything, he's just got it all wrong! This is why I think he should try my tune. It will still need to be customized to his engine but all the parameters are correct.

    Load my tune then load his as an alternate and look at the tables. When B3647 and B3601 are equal and B3618 are stoich the computer will run semi-open loop meaning it will use the STRIM's to maintain stoich, the LTRIM's are no longer used at all. There are more settings then I mentioned to get semi-open loop working and that's covered in the manual.

    Then use B3647 to command your AFR, no more PE mode. This is very tunable through out the RPM and MAP range and to me is the perfect way to go. Very easy to always command the AFR the engine likes under various driving conditions.

    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. #20
    Joe (Moderator) joecar's Avatar
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    B3618 does not have to be EQ 1.00 (same AFR as B3601) for SOL to enable...

    SOL enables from the EQ 1.00 cells in B3647 (or in B3605 if B4206 is enabled) if those cells are the richest of the enabled tables at that moment...

    B3618 enables when the PE enablers B3608-B3816 are met, but B3618 provides the commanded EQ (or AFR) only if it is the richest of all the enabled tables.

    Setting B3618 to EQ 1.00 does not "disable" PE... it merely makes it leaner than the high MAP columns of B3647 or B3605.


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