Oxygen Sensor Position

streetrover · Post by **streetrover** » Mon Jul 21, 2014 8:08 pm

Hello all!

I'm getting very erratic readings from my O2 sensor. The gauge will fluctuate wildly from 22.4 to 8.2. I've calibrated the sensor (Innovate MTX-L wideband. Perhaps the sensor is located too close to the collector. The information that came with the gauge specified mounting the sensor bung 24 inches from header collector. My exhaust guy placed it about 4 inches from collector. Could this be the problem? Any thoughts?

Thanks,
Bob

kjones6039 · Post by **kjones6039** » Mon Jul 21, 2014 8:37 pm

4 inches downstream from the collector?

An exhaust leak upstream from the sensor can cause the problem you describe.

Ken

streetrover · Post by **streetrover** » Mon Jul 21, 2014 9:08 pm

Yup, 4 inches downstream from the collector. No exhaust leaks though...

Matt Cramer · Post by **Matt Cramer** » Tue Jul 22, 2014 5:55 am

How far is it from the exit of the exhaust - is this one running nearly open headers, or a full length exhaust?

DaveEFI · Post by **DaveEFI** » Tue Jul 22, 2014 6:11 am

streetrover wrote:Yup, 4 inches downstream from the collector. No exhaust leaks though...

You might find this of use:-

http://www.wbo2.com/lsu/position.htm

streetrover · Post by **streetrover** » Tue Jul 22, 2014 4:07 pm

Entire exhaust pipe (from header collector on each side) is about 5ft, including dual glass-paks.

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Oxygen Sensor Position

Oxygen Sensor Position

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