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Thread: NE1: WTF Scanner keeps asking for more Fuel

  1. #1
    Lifetime Member Chalky's Avatar
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    Default NE1: WTF Scanner keeps asking for more Fuel

    I have been trying to get a decent BEN Map.

    I installed stock VE Table and went out fileld in BEN Map, came back and did a paste/multiply into my VE Table. Most changes were within the 1.04-1.06 range. Loaded tun, went back out and BEN Map was now calling for anywhere from 1.14-1.28.

    Not sure what is going on. I have checked everything from teh 02 to the wiring for V2 and my SM-AFR.

    Also had an issue with BEN Map values performing wrong multiplication when updating VE Table.

    Tech support, Hello?
    2015 Z06 A8

  2. #2
    Joe (Moderator) joecar's Avatar
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    G'day Chalky...

    Some things to check:
    - are you using EQ or AFR units and NOT Lambda...?
    - are you using the right calc pid for your WB...?
    - are your MAP units the same in the scantool and the tunetool...?


  3. #3
    Lifetime Member Chalky's Avatar
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    Quote Originally Posted by joecar
    G'day Chalky...

    Some things to check:
    - are you using EQ or AFR units and NOT Lambda...?
    - are you using the right calc pid for your WB...?
    - are your MAP units the same in the scantool and the tunetool...?

    Joe:

    G'day to you mate:

    Joe using same pids as I have always used and that have worked in the past for PLX SM-AFR. AFR in a cruise state seems to be fine, a tad rich but so is my CFOL table.

    I use AFR when doing working with fuel calc. it's easier for me as I can relate to AfR. Lambda and EQ require me to think to much.

    I am getting ready tos tep out and have soem dinner but will look at these parameters when i get back and let you know what I find.

    what has me puzzled is the fact that I take my BeN cell values and paste/multply into my VE table and the next BEn Map asks for even more fuel than the time before.
    2015 Z06 A8

  4. #4
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Chalky
    ...what has me puzzled is the fact that I take my BeN cell values and paste/multply into my VE table and the next BEn Map asks for even more fuel than the time before.
    This has me thinking that something is "upside-down"...

    Are you losing fuel pressure...?

  5. #5
    Lifetime Member mr.prick's Avatar
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    if you keep adding fuel and you are still getting high BENs
    you might have a bad wideband sensor.
    this happened to me , and i kept getting lean spikes in the
    upper kPa areas and hard throttle , but in lower kPa and moderate throttle
    i had normal BENs.

    also after restarting your IAT temp will be high.
    filter out IAT above 96*F and see if that helps.

  6. #6
    EFILive Crew Site Admin Tordne's Avatar
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    Given that you have the RoadRunner you could just do a simple stationary test.

    With the car idling just raise and lower the VE table in the idle region and watch the resulting WBO2 AFR and also the calculated BEN figure. As you lower the VE the WB should show leaner and the BEN should increase. As you raise it the WB should go rich and the BEN lower.
    Andrew
    EFILive Crew


  7. #7
    Lifetime Member Chalky's Avatar
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    Quote Originally Posted by joecar
    This has me thinking that something is "upside-down"...

    Are you losing fuel pressure...?
    Joe:

    I did check it @ idle. My guage shows 60 psi @ idle. No way to check it at speed.
    2015 Z06 A8

  8. #8
    Lifetime Member Chalky's Avatar
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    Quote Originally Posted by Tordne
    Given that you have the RoadRunner you could just do a simple stationary test.

    With the car idling just raise and lower the VE table in the idle region and watch the resulting WBO2 AFR and also the calculated BEN figure. As you lower the VE the WB should show leaner and the BEN should increase. As you raise it the WB should go rich and the BEN lower.
    Andrew:

    I bumped my VE table by 15% and BEN was still adding fuel. The moe fuel I add, teh more it commands.

    If i go to CL, the same VE table that I added 15% to shows lower FTC as rich and high rpm/HIGH KPA cells need a bit of fuel. I would expect this out of a modified car.
    2015 Z06 A8

  9. #9
    Joe (Moderator) joecar's Avatar
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    Possibilities:
    - IFR may not be correct.
    - airleak.
    - fuel pressure dropping.

    You need the extension hose for the fuel pressure gauge; and try to route the hose to the left rear corner of the hood (my F-body has a gap that I can squeeze the hose thru and tie the guage to the wiper arm using a nylon ziptie... ...it's only temporary...; I don't know how you would do this on a Y-body, but I imagine it's do-able)

  10. #10
    Lifetime Member Chalky's Avatar
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    Quote Originally Posted by joecar
    Possibilities:
    - IFR may not be correct.
    - airleak.
    - fuel pressure dropping.

    You need the extension hose for the fuel pressure guage; and try to route the hose to the left rear corner of the hood (my F-body has a gap that I can squeeze the hose thru and tie the guage to the wiper arm using a nylon ziptie... ...it's only temporary...; I don't know how you would do this on a Y-body, but I imagine it's do-able)
    I thought air leak to and have had the intake on and off more than I care to talk about.

    I have an extended warranty and a good service writer I work with. Car is going in Monday for a diagnosis. Maybe they can find something.
    2015 Z06 A8

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