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AEM wideband problems

Discussion in 'Non-Turbo Tech questions' started by VIPERBLUELX, May 24, 2009.

  1. VIPERBLUELX

    Joined:
    Dec 21, 2004
    I bought a 98 Cobra that had recently had a new AEM wideband with gauge installed. At idle the thing seems to work ok. But at even the lightest throttle pressure it goes fully lean and just shows ---- on the display. At WOT it'll move toward 11.7:1 and then flashed to fully lean and goes ---- again. Also does the same thing when coasting. So basically this thing is worthless in it's current state. Any ideas?
     
    VIPERBLUELX, May 24, 2009
    #1

  2. 96b.boy

    Joined:
    Oct 20, 2008
    coasting if you didn't not turn costing fuel shut off off it will go off the gauge lean . at wot does it break up at all like you are going lean ? mine did the same thing at wot and the sensor was bad swapped it out and no issues since . the light load has me wondering if you may have a hole in the tune .sensor going bad will start to show lean at wot then once it completly goes it will sit ay 14.6
     
    96b.boy, May 24, 2009
    #2

  3. VIPERBLUELX

    Joined:
    Dec 21, 2004
    The car was just tuned this past week on the dyno, 11.8:1 or so pretty much till redline. The car is in closed loop at cruise and light throttle so there's no way at light throttle the a/f is really leaner than 17:1(highest the gauge goes) because the fuel trims would be way off.
     
    VIPERBLUELX, May 24, 2009
    #3

  4. 96b.boy

    Joined:
    Oct 20, 2008
    i'd say swap the sensor and was it dyno tuned then driven or just dynoed?
     
    96b.boy, May 24, 2009
    #4

  5. Mike93SVT

    Joined:
    Feb 26, 2006
    i would just double check the ground and power wires and replace the sensor. if that doesn't work for you, then it may be bad. but those are nice widebands, i ran one in the past
     
    Mike93SVT, May 25, 2009
    #5

  6. furchaser

    Joined:
    Sep 15, 2007
    I kept this link that someone put up before the server crashed.
     
    furchaser, May 27, 2009
    #6

  7. VIPERBLUELX

    Joined:
    Dec 21, 2004
    Well I unplugged the harnesses from the back of the gauge just to check things and when I plugged them back in the gauge goes through it's normal setup stuff and then stick at 14.8. I guess I'll pull the sensor out and try the brake cleaner trick, but I think I've got bad wiring in the harness or something.
     
    VIPERBLUELX, May 27, 2009
    #7

  8. lilcobrar

    Joined:
    Sep 28, 2004
    well I hooked the hot and ground directly to my boost box and nothing changes, the sensor doesn't heat up. I checked continuity and all the wiring is good. What's the best source for the sensor and isn't there a VW part number I can order from a local parts store?
     
    lilcobrar, Jun 2, 2009
    #8

  9. 96b.boy

    Joined:
    Oct 20, 2008
    VIPERBLUELX your sensor is bad i just went throw this on mine
     
    96b.boy, Jun 2, 2009
    #9
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