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ECMlink Running rich when letting off throttle

Posted by mattp_65, Jun 23, 2013

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  1. mattp_65

    mattp_65 Proven Member

    249
    53
    Joined Aug 16, 2004
    Lake Stevens, Washington
    Why am I running rich after letting off the gas pedal on a normal cruise. My Afr would go to about 9.0
    I'm breaking in the new motor and I just did an idle and cruise tune and still having issues of running rich after letting off on throttle. I will post log when I get home, but how to post a log when max limit is 488kb, my cruise log is about 1mb? But any one have any ideas?
    Also now I'm almost stalling out when coming to a complete stop. Idle set at 900 rpm. Running now from 500-900 rpm. Any help is appreciated.
    Thanks
    Matt
     

    Street Build 652  1

    1978 Chevy LUV
    automatic · 4G63t Swapped

    1K  1

    1995 Eagle Talon TSi AWD
    11.98 @ 125 · 2G DSM

    707  0

    1995 Eagle Talon TSi AWD
    12.04 @ 121.000 · 2G DSM
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  2. viperlp01

    viperlp01 Proven Member

    2,148
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    Joined Oct 9, 2006
    Kalamazoo, Michigan
    You TPS is not adjusted correctly and the ecu is not reverting to coasting fuel cut.
     

    2K  0

    1997 Eagle Talon TSi AWD
    9.737 @ 140.310 · 2G DSM
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  3. mattp_65

    mattp_65 Proven Member

    249
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    Joined Aug 16, 2004
    Lake Stevens, Washington
    Thanks Viper! I have my idle working now and going lean on decel like it is suppose too. Now right after I let go of the gas my AFR goes to 9.0 then directly maxing out at 18.0
    Is this Normal?

    thanks
    Matt
     

    Street Build 652  1

    1978 Chevy LUV
    automatic · 4G63t Swapped

    1K  1

    1995 Eagle Talon TSi AWD
    11.98 @ 125 · 2G DSM

    707  0

    1995 Eagle Talon TSi AWD
    12.04 @ 121.000 · 2G DSM
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  4. SNAKE_15

    SNAKE_15 Proven Member

    483
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    Joined Aug 28, 2012
    Bakersfield, California
    When you let go if the gas your afr should have 3 line dashes and not a number. Do you let go of the gas and keep it in gear or do you put ir in neutral
     

    2K  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM

    Street Build 935  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  5. mattp_65

    mattp_65 Proven Member

    249
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    Joined Aug 16, 2004
    Lake Stevens, Washington
    3 line dashes? Meaning 18.0:1 ratio

    My car is in gear due to that I am still breaking in my motor. But after motor break in I still keep it in gear til I stop.
    Thanks
    Matt
     

    Street Build 652  1

    1978 Chevy LUV
    automatic · 4G63t Swapped

    1K  1

    1995 Eagle Talon TSi AWD
    11.98 @ 125 · 2G DSM

    707  0

    1995 Eagle Talon TSi AWD
    12.04 @ 121.000 · 2G DSM
    Loading...
  6. andyb2637

    andyb2637 Proven Member

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    0
    Joined Jul 13, 2008
    Chicopee, Massachusetts
    Yeap, there should be no gas being used thus givin you a lean mixture. Are you sure you wideband isn't to close to you exhuats mani or it isn't angled 20-30* causing it to get built up with sut? What kind of external wb you using?

    Also if your using dsm link the fc offset will help you with the staling if you just went from rec bov to atmosph bov.
     
    Last edited: Jun 27, 2013
  7. MJcanada

    MJcanada Proven Member

    2,144
    48
    Joined Jun 25, 2011
    campabello, South Carolina
    This is because you cut off the engines air supply with your foot faster than your ecu cuts off the engines fuel supply.
     

    1K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  8. SNAKE_15

    SNAKE_15 Proven Member

    483
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    Joined Aug 28, 2012
    Bakersfield, California
    What type of wideband are you using
     

    2K  0

    1995 Eagle Talon TSi AWD
    manual · 2G DSM

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    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  9. mattp_65

    mattp_65 Proven Member

    249
    53
    Joined Aug 16, 2004
    Lake Stevens, Washington
    I have an innovate LM-1 wristband wideband similar up LC-1
     

    Street Build 652  1

    1978 Chevy LUV
    automatic · 4G63t Swapped

    1K  1

    1995 Eagle Talon TSi AWD
    11.98 @ 125 · 2G DSM

    707  0

    1995 Eagle Talon TSi AWD
    12.04 @ 121.000 · 2G DSM
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  10. -Erics97GSt-

    -Erics97GSt- Probationary Member

    5
    0
    Joined May 31, 2013
    Humble, Texas
    I have the same wideband installed before cat, I get the same problem when letting off the gas. I bet going I to the ECU settings and making a few tweaks will take care of that. I'm going to do mine tonight. And ill let you know what happens.
     
  11. zachwilliams02

    zachwilliams02 Proven Member

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    Joined Dec 30, 2012
    marietta, New York
    hey guys im having the same problem and i have a few ideas about what it could be.
    my bov is vented... i know i know its bad to vent but i cant recirculate it because of my crappy inner-cooler piping and yes im on the stock maf. so i think my car may be doing it because its vented. another thing is that i just switched to a big turbo a few months ago, would that have anything to do with it.
    finally my boost estimated and my air fuel estimated are both completely wrong. like 20 Hg of vacuum at idle when really i have 10
     
  12. 911gdsmboostin

    911gdsmboostin Proven Member

    306
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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Any ideas what else can cause it same problem here but tps is adjusted right to .63v likening was explained to and read so many times already any help appriciate motor is fresh woth evo 3 anD supporting mods
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
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  13. lasershark

    lasershark Proven Member

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    over yander, Idaho
    Should have started a new thread...
    Have you verified the closed throttle switch is functioning? Is this for the 1g or 2g?
     

    3K  5

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  14. 911gdsmboostin

    911gdsmboostin Proven Member

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    Irwin, Pennsylvania
    It's a 1g and yes idle switch tested fine and I adjusted it while tb off the car so I had a good adjustment on it I adjusted till switch was shut then gave ruffle 1/16 of a turn just enough to keep throttle blade open and I doubble cked it because ei was having idle issues and it was working fine I think I iac is acting up though I can't get it in the range it should be I dono if this would affect anything I'm not running nb simulation I'm using stock narrowban o2 and as well the nb o2 is stuck at .20v it's not fluctuating like i have read it's soposto could this be the culprit? It shutters hard enough to some times stall the car out
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
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  15. 911gdsmboostin

    911gdsmboostin Proven Member

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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Also this is an auto car if that helps
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
    Loading...
  16. lasershark

    lasershark Proven Member

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    over yander, Idaho
    Not sure what a soposto is? I would start with trying to get the o2 to cycle.
    Are you running ecmlink? Maybe post a log.
     

    3K  5

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  17. miliman13

    miliman13 Proven Member

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    tampa, Florida
    My recent experience, is i prefer simulating the narrow band, it swings based on set values, and provides a more steady AFR on the WB, also makes matching target A/F and WB A/F easier. Since your 02 is only used under 40-50% throttle (i believe) so idle and light cruise.

    Your WB should be able to provide the ECU with the simulated narrow band signal, this is a box you can check.

    Side note, its easy no make mistakes, especially with phones, but look over your text so you can catch any misspellings.

    But its expected to lean out right after letting off throttle. Idk what exactly your solving ?
     

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    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

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    1998 Mitsubishi Eclipse GSX
    13.066 @ 106.880 · 2G DSM
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  18. 911gdsmboostin

    911gdsmboostin Proven Member

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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    hera few half puls some driving arund motor still breaking in
     

    Attached Files:

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
    Loading...
  19. steve

    steve DSM Wiseman

    12,767
    549
    Joined Feb 3, 2002
    St. Charles, Illinois
    Your log show clearly that your idle position switch isn't working. Either you have lost the ground to the throttle body, misadjusted it, or there is an issue with the wiring.
     

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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    1990TSIAWDTALON likes this.
  20. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    ^^^ You beat me to it but that switch has to function to tell the ecu you are coasting or idling. Double check the ground strap to it and that it is plugged in.
     

    Street Build 3K  27

    1992 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    542  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    449  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 650  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  21. 911gdsmboostin

    911gdsmboostin Proven Member

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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Ok I do not know appearently what I'm looking at it don't understand what line or value is showing its not working.. please explain if you could please..



    Their is no ground strap to it just a wore off the back for the harness I took the brace from cas to tb out and read if doing it run a drunk to one of the bolts so that excatly what I did I have a ground right off the negitive batt terminal to tb bolt for a ground
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
    Loading...
  22. 911gdsmboostin

    911gdsmboostin Proven Member

    306
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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Also would any of this be a reason my front nb o2 is not occilating? Or moving around like it should? Or could it possibly be locked in closed loop or open loop from link.. I did buy link used and had settings in it alreafy
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
    Loading...
  23. 911gdsmboostin

    911gdsmboostin Proven Member

    306
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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Ok just checked it again switch shows contunity with tb closed as soon as tb opens it goes to 1 on ohm meter so I'd assume switch is functioning and grounded and adjusted good how would I ck the wore going to switch to make sure it's working? Also is their somthing in link that could affect this function in the tab for tb the idle switch is enabled and I'm not using tps for switch nor the second option when it won't work while moving ..
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
    Loading...
  24. steve

    steve DSM Wiseman

    12,767
    549
    Joined Feb 3, 2002
    St. Charles, Illinois
    What year is your car and what year is the ECU (Part number)?

    If you add IdleSW to your list of displayed values you'll note that it never goes to 1. In the ECU Config under the RPM/TPS tab in the TPS and Idle Switch Controls you have the idle switch operation enabled as it should be but since you not simulating it the ECU is expecting to see the voltage from the ECU to the IPS be grounded by the switch when the throttle is closed. The green wire from the runs to ECU pin 6 or 14 depending on the version of the ECU (90 or 91+).

    With the ECU on you should see close to 0v at the IPS terminal with the throttle closed and 12v with it opened.

    The IPS depends on the ground strap attached to the top of the TB over to the stud on the elbow and the ground wire from the firewall to the intake manifold bolts holding the throttle cable adjuster.

    Are you running a 2G MAF?
    What size injectors?
    Please disable the MAF Clamp function.

    And yes, it looks like your front O2 is dead but it could be a wiring problem.
     
    Last edited: Oct 13, 2015

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  25. 911gdsmboostin

    911gdsmboostin Proven Member

    306
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    Joined Sep 5, 2014
    Irwin, Pennsylvania
    Modle year was in between yrs car is titled as a 90 but all engine components are a 91 style I'm running 2g maf fic 650cc the ecu is out of a 91 I can get numbers I was concerned when I got the ecu as it had some kind of internal Conversion when I researched it it was for a 91-94 ecu Converted to a 90ecu I asked Tom ar ecm link about it he said if it was running alright not to worrie or switch pins I think we're 6&14 at that time the car had more problems to worrie about then this issue but now it's a new motor and is acting up with it what I remember reading was the pins that needed swapped for for the tach that I though but my tach was working fine so I figured it was okay so I'm assuming the pins may need swapped because the ecu was Converted?
     

    Drag Race Build 713  1

    1992 Eagle Talon TSi
    12.493 @ 117.5 · 1G DSM
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