1. Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

ECMlink GM Style 4 bar map sensor (generic) - runs rich after replacement

Posted by ErikTande, Apr 30, 2018

Please Support Fuel Injector Clinic
Please Support Rix Racing
  1. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    I'm having a problem that I think I have narrowed down to a bad map sensor. On the car now is the OmniPower GM-style 4-bar MAP sensor that I ordered from ECMLink with my SD setup.
    http://www.ecmtuning.com/product_info.php?products_id=47

    However, I think it's going bad (car randomly won't run but if I unplug the MAP sensor and plug it back in the problem goes away temporarily).

    So I ordered this cheap replacement from Amazon, and it looks identical to the unit from ECMLink, minus the OmniPower markings.


    https://www.amazon.com/gp/product/B01M59MHRF


    When I plugged it in the car starts but runs WAY rich (10.9). Does this generic unit need to be calibrated in anyway? Or do I just need to shell out the $100 for a real one from ECMLink?

    Thanks!


    sensor1.gif sensor2.gif
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
  2. lasthope05

    lasthope05 Proven Member

    965
    230
    Joined Mar 31, 2006
    Philadelphia, Pennsylvania
    You need to find the spec sheet on that particular sensor and input those values as a user defined sensor.

    You could also log raw map voltage and use a hand held vacuum/pressure gauge. Pull full vacuum and input as min voltage @ 20kpa. Do the same for boost and that is your max voltage @ 400kpa. Give that a try and hope the sensor is linear.
     
    Last edited: Apr 30, 2018
    ErikTande likes this.
  3. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    I messaged the seller and I'm still waiting for a response. In the mean time I found this link:
    https://perfecttuning.net/en/accessories/59-gm-4-bar-map-sensor.html
    and they have the specs listed as "3.5 kPa at 0 volts and 416.5 kPa at 5 volts."

    Assuming that is correct for my sensor, what values would I enter into ECMLink and where?

    Thanks again!
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
  4. bastarddsm

    bastarddsm Proven Member

    4,525
    1,074
    Joined Aug 26, 2003
    Mendota, Illinois
    Convert those 2 points to psi. then plot them and find the slope (psi/volt) and where 0psia (offset)is.
     

    Showcar Build 6K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
    Loading...
  5. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    OK so google tells me
    3.5 kPa = 0.507632 psi
    416.5 kPa = 60.408218 psi

    How do I plot them and find the slope and where the offset is? (That's all greek to me sorry : P)
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
  6. lasthope05

    lasthope05 Proven Member

    965
    230
    Joined Mar 31, 2006
    Philadelphia, Pennsylvania
    Easiest way to find it is to use the method I told you above with a vacuum pump and log raw voltage for min volts. Since it's a 4 bar use a -29inhg for min volts and 45psi for max volts. Use a compressor(or the same pump if it has pressure) to Max out the sensor to get your max volts. That will get you into the ball park and you can fine tune from there.
     
  7. Mello

    Mello Proven Member

    1,074
    314
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    From the values you posted your slope would be 11.9801172 psi/volt
     
    ErikTande likes this.
  8. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    5,353
    2,665
    Joined Nov 14, 2013
    Independence, Kansas
    Try a different sensor so you KNOW its the sensor giving you problems Erik.
     

    Street Build 4K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    749  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  13  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
    Dstarperformance01 likes this.
  9. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    That's what I'm trying to do :p
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
    Dstarperformance01 likes this.
  10. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    5,353
    2,665
    Joined Nov 14, 2013
    Independence, Kansas
    Got ya! I had a funky Omni bar sensor too and just replaced it with a new one from EcmLink. (they offered to replace mine, and look at the old one, but that was a couple years ago). It seemed to fix the problem I was having and I am not sure now exactly what was goofy with it but I did replace it. Surely someone in the Colorado area has one to test with.
     

    Street Build 4K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    749  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  13  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
    ErikTande and Dstarperformance01 like this.
  11. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    Ok, so I'll plug that number into the spot in link. What would the "volts(user defined)" be in that case?

    Thanks again!
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
  12. Mello

    Mello Proven Member

    1,074
    314
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Try -042373 volts.
     
    ErikTande likes this.
  13. ErikTande

    ErikTande Supporting Member

    910
    300
    Joined Dec 17, 2012
    Centennial, Colorado
    Cool, no decimal, right? Also, how did you come up with those numbers? Hopefully I can try do it myself next time!
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
    Loading...
  14. Mello

    Mello Proven Member

    1,074
    314
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    sorry has a decimal. Use -.042373 volts
     
    ErikTande likes this.
  15. Falcon91

    Falcon91 Proven Member

    31
    5
    Joined May 14, 2018
    Fredericksburg, Iowa
    Don't mean to thread jack here, i'm currently running a GM 3 Bar map, i'm upgrading my turbo and will be running more boost (30-35psi). Can i use the plug for the 3 bar for the new 4 bar or are the plugs different?
     

    Street Build 527  7

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
    Loading...
  16. Vegas smith

    Vegas smith Proven Member

    3,129
    1,672
    Joined Dec 2, 2002
    Houston, Texas
    Should be the same if it's the same brand.
     

    Street Build 4K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
    iugrad92turbo likes this.
  17. iugrad92turbo

    iugrad92turbo Supporting Member

    10,549
    439
    Joined May 22, 2007
    Kalamazoo, Michigan
    Same plug .
     

    7K  5

    1992 Eagle Talon TSi
    awd · manual · 1G DSM
    Loading...
  18. Falcon91

    Falcon91 Proven Member

    31
    5
    Joined May 14, 2018
    Fredericksburg, Iowa
    Both GM, The plug looks the same just didn't know if they pinned out differently. Thanks!
     

    Street Build 527  7

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
    Loading...

Share This Page

Support Vendors who Support the DSM Community
ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications OHM Racing RixRacing RockAuto SouthBay Fuel Injectors STM Tuned Track Decals Track Sculptures VR Speed Factory