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Thread: Highway enable not activating

  1. #1
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    Highway enable not activating

    I have enabled the hiway patch and it shows it is enabled but it is not going into OL, which to my understanding it should when all the qualifiers are met and it goes into hiway mode. Is that not correct?
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  2. #2
    Fuel Injected! jim_in_dorris's Avatar
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    I just looked at the highway lean cruise code, it is supposed to be in closed loop.
    Square body stepsides forever!!!

  3. #3
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    Can you post up a link to the write-up you found that information? I was under the impression that it would go into OL during the highway mode due to the AFR moving toward the 16:1 area and if it remained in CL the ecm would constantly adjust to get back to 14.7:1 thereby working against itself.
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  4. #4
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    http://www.gearhead-efi.com/Fuel-Inj...t=7747+highway

    This is where I seen the reference to it running in OL during Hiway lean. EagleMark made the reference.
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  5. #5
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    This is my latest datalog and bin file. The hiway lean isn't engaging and I do not see why...all parameters are being met and the patch is showing up as installed
    Attached Files Attached Files
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  6. #6
    RIP EagleMark's Avatar
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    I'll try to take a look at your data log later tonight.

    But it does go Open Loop when it enters Hyway Lean Cruise. Sure hope your tune is in order before you enabled it!

    Post your bin file too!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  7. #7
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    Thanks...I have washed and rinsed the VE tables and everything else seems right on. Spark Plugs are looking spot on, No codes, knock counts are around 3 at startup, but I feel that is the exhaust leak I am chasing around. I haven't did any WOT tuning yet but didn't think that would be important at this point. Am I wrong? Should I back off on the lean cruise till after I get WOT tuned in? Its a 4x4 cruiser so I am not racing it, just pulling my boat and hauling hay.
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  8. #8
    Fuel Injected! jim_in_dorris's Avatar
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    Mark, I thought that what happened is that it uses the open loop AFR tables in closed loop. Look at this piece of code.

    DOREST:
    ; LDAA $08 ; status
    ; BPL NOWAY ; no hiway unless cls lp ok !!! here is where it checks the closed loop status Jim

    LDAA $78 ; timer, hiway spark
    CMPA $D025 ; threshold (same as hiway SA)
    Square body stepsides forever!!!

  9. #9
    RIP EagleMark's Avatar
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    Quote Originally Posted by EagleMark View Post
    Post your bin file too!
    I need to look at your bin file.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  10. #10
    RIP EagleMark's Avatar
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    Quote Originally Posted by jim_in_dorris View Post
    Mark, I thought that what happened is that it uses the open loop AFR tables in closed loop. Look at this piece of code.

    DOREST:
    ; LDAA $08 ; status
    ; BPL NOWAY ; no hiway unless cls lp ok !!! here is where it checks the closed loop status Jim

    LDAA $78 ; timer, hiway spark
    CMPA $D025 ; threshold (same as hiway SA)
    Yes it has to be in CL then checks the qualifiers, if all OK? Then it goes OL to HLC AFR table etc.... outlined in Hyway Lean Cruise Mode. I've checked mine many a time and it goes OL, you can watch the O2 sensor stop cross counts IIRC...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  11. #11
    Fuel Injected! jim_in_dorris's Avatar
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    Okay, Mark I found the set to OL in the code. I was just looking at the patch, not the rest of the code. I WAS WRONG!!! Sorry
    Square body stepsides forever!!!

  12. #12
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    Sorry guys...I thought it was in the zip file I uploaded. I appreciate you guys looking at this for me.
    Attached Files Attached Files
    Jason
    1987 Silverado V-10 TBI
    Goodwrench 350 260hp/350tq motor
    3.08 gear 400 trans
    Moates Tuning Equip
    TunerPro Software
    Level, Plumb, and Square

  13. #13
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    I would try removeing and reapplying the hlc patch and see what happens.

  14. #14
    RIP EagleMark's Avatar
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    Quote Originally Posted by jim_in_dorris View Post
    Okay, Mark I found the set to OL in the code. I was just looking at the patch, not the rest of the code. I WAS WRONG!!! Sorry
    No reason to be sorry, conversation is good and if we make a mistake well we all learn that day!

    I do my best learning from mistakes!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  15. #15
    RIP EagleMark's Avatar
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    Always have to check for error codes when data logging and fix before log. You have an Error 51 Prom (very bad, nothing works right) set.

    30 MPH is a little low to enable, your still accelerating. You want to be up to hiway cruise speed and not working hard when it goes into HLC.... unless you have other plans? It does not work well under load! Like around town...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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