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Old 09-20-2010, 07:01 PM   #1
Scooby Newbie
Member#: 45808
Join Date: Oct 2003
Chapter/Region: NESIC
Location: Pepperell, MA
2003 WRX Wagon
JDM Sedan'd Sonic Yellow

Default Installed Wideband...is it working right?

So, I recently installed an innovative LC-1 wideband o2 gauge in my 03 WRX. For those of you who are not familiar with this particular wideband, you need to calibrate the sensor to the LC-1 controller. Calibration is a multistep process, but still fairly easy. Now, I still have a previous open source tune from about 2 years ago, running 19 lbs on a TD04. It runs pretty well, idles fine, nice and smooth through the power band. The problem is, my wide band is reading 11.5-12.0 at idle, and around 9.0 at WOT. Bare in mind, I am blowing NO smoke, and my car has been 100% reliable and drivable for 2 years. Is it possible that my tune really is that rich? or is it more likely that the gauge is still not properly calibrated.

I tried to troubleshoot this on my own through the following steps which all yielded no change: The first location of the o2 sensor was in the downpipe, about 4 inches from the turbo (the DP had a bung already there, so I started it there) the readings were all about the same as above. I re-calibrated it using the directions, and got the same results. My mechanic friend suggested that it was possibly the location that was causing it to read incorrectly (he strongly believes that there is NO WAY my car is running that rich and is still drivable) ...So, we moved the sensor to the rear o2 sensor bung in the midpipe, re-calibrated it according to the directions...still reading the same. Do you think that either the LC-1, or the sensor may possibly be faulty? Or can a WRX really run that rich and still be reliable? Thanks!


PS Mods, if this should be in engine management, please feel free to move it.
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Old 09-20-2010, 08:39 PM   #2
Dutch Scooby lover
Scooby Specialist
Member#: 32452
Join Date: Feb 2003
Location: The Netherlands
1998 Impreza Turbo


Maybe the Wideband is DOA.
I've seen it happen twice.

One was a PLX with incorrect wiring (after rewiring it worked flawlessly), the other was a Innovate which would loose its calibration, or just plain calibrate itself into false values.

I some time ago read a post on another forum about how the wiring of the Innovate could be a factor.Do you have the gauge connected to the switched 12v of the car, or are you powering the WB with a dedicated fused wire straight from the battery (with a on/off switch, or a relay triggered by the switched 12v) as Innovate itself think that could be a possible source.

If you are using the 12v switched factory wiring, try and run a fused wire directly from the battery, to try and eliminate as much variables as you can.

Wot a AFR of 9 is way too rich, and would lead to drivability problems, smoke out of the exhaust, and general misfiring.
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