UEGO not Reading the Same on the computer compared to gauge?

[turbofox]

Hey guys,  Getting the car put back together now and I'm still hunting for an answer from last year when the car was running.  the problem is that when the AEM wide band gauge says let say...  15.0 the AEM computer sees a 13.5, and it's pretty much never actually on target from what I've seen.  I've set everything up the way the instructions say to do it with the gain and air fuel map etc etc..  Still doesn't see right...  it's really annoying since WOT will read 11.5 on the gauge and like 9.8 at the computer...  also same for cruse...  I'm not sure what it could be.  I've played with the gains, did the off set with a volt meter (looked for signal loss etc) and everything check out except for it not matching up...  Has anyone else run into this problem?  Or know of what it could be?  thanks again guys!

[mld54]

I'm using a UEGO 1000 with mine. When I set mine up, I got a adjustable DC voltage controller that has a rheostat to adjust the voltage. I hooked it to my wide band display ( input from the wide band sensor ) and the AEM input ( from the wide band ) then I slowly adjusted the voltage up ( starting from 0 volts ) every time it came to a break point I adjusted the table so the AEM reading matched the wide band display. Now the AEM matches the wide band display exactly.

[turbofox]

Ahh interesting, thats what I was curious on if there was a way to throw the input through the wideband sensor and then read the display to adjust...  Did you just hook it up to one of the pins going into the wideband comming from the sensor?  (i'm just afraid to burn something out) I never really understood what signal the wideband would see, i just alwasy knew that it was a 0-5V output usually...

On a side note, was yours pretty far off or fairly good for the most part?

[mld54]

the sensor I had wasn't in the wizard so that is the way I calibrated it to begin with, I just hooked it up to the display using the input wire from the controler, my wide band has a sensor, a controller for the sensor and a display

[NMccann]

Hey,

I had the same problem when setting mine up, well specifically the right side only.  Anyway, with the sensor unplugged, seems to me the gauge reads 14.7, well I did that so it wouldn't move around while I was fooling around with the software.  There was a global gain I had to adjust, it's buried in the submenues, (there are separate ones for left and right) but as soon as that was tweaked everything was good.  If that's not set right, closed loop adjustments will be waaayyyy off.....  I'm assuming you're tieing in right over at the computer.... and not under the car into the stock harness.

[mld54]

I hooked in at the display for the wide band (at the input from the sensor controller) and the wire from the AEM EMS that hooks to the output from the wide band (at the display). That way I was using all the wiring that will be used during normal operation. If I remember correctly the global gain is set to 1 so there is no correction. I'm not using any of the original wiring on the car. The sensor is not under the car, it is in the down pipe in the engine compartment. The original narrow band sensors are gone.

[turbofox]

I hooked in at the display for the wide band (at the input from the sensor controller) and the wire from the AEM EMS that hooks to the output from the wide band (at the display). That way I was using all the wiring that will be used during normal operation. If I remember correctly the global gain is set to 1 so there is no correction. I'm not using any of the original wiring on the car. The sensor is not under the car, it is in the down pipe in the engine compartment. The original narrow band sensors are gone.

Yep thats how mine is setup.  I used the O21 input on the AEM box which comes directly from the AEM gauge, and then the gauge is hooked up the the wideband controller, then to the 02 sensor.  Did the map with the points that the AEM gauge said to put in for the EMS, and gain at 1.  coudl never figure out why tuning was sucha pain but all the O2 trims etc are never correct.  So we put it on the dyno and had 2 o2's running, 1 from the dyno, and the AEM.  the dyno and the AEM gauge we're the same readings, so I know the sensor is good, and the gauge is correct as well.  but the AEM computer was not reading close to what the gauge was ready.  Set it up 3 times to make sure it correct but never has been. So i'm hoping to try and set it off the gauge.  I'll have to try and get a power supply fgrom work and plug it into the o2 sensor plug on the gauge.  Does anyone know what pin is the signal pin for the gauge box?  I'm hoping to just sowly turn up the supply and then just cross over from what the gauge says to the AEM computer.  (which it sounds like it's been done before)...

[turbofox]

Got it working last night!  Thanks for the info MLD54!  Thats what I needed to get it right.  The curve was nowhere near what they said to have it set for.

[mld54]

That's good to hear