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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: subforry on March 24, 2014, 01:33:14 PM

Title: O2 sensor
Post by: subforry on March 24, 2014, 01:33:14 PM

I have been meaning to ask this for awhile now.  What does the O2 sensor do?  Is it before the cat air/fuel ratio or after the cat emissions stuff?  Does it need to be replaced since mine is 18 years old, though low mileage of 24k?
Thanks.

Title: Re: O2 sensor
Post by: Scott_ on March 24, 2014, 06:06:35 PM

It is after the cat converter to monitor the effectiveness of the converter and adjust the fuel mixture based upon it's readings.

Title: Re: O2 sensor
Post by: johnny on March 25, 2014, 12:26:22 AM

i took mine out and installed a sparkplug to effective utilize unburned gas... when i getts my valves adjusted i will put the 02 sener back in there...

j o

Title: Re: O2 sensor
Post by: wmax351 on March 25, 2014, 03:56:15 AM

I added one to my K75.

Title: Re: O2 sensor
Post by: Motorhobo on March 25, 2014, 06:21:27 AM

Quote from: wmax351 on March 25, 2014, 03:56:15 AM

I added one to my K75.

Why would you do that? Not that I doubt you have a good reason besides it being a conversation starter.

Van.

Title: Re: O2 sensor
Post by: wmax351 on March 25, 2014, 05:48:43 PM

I have an aftermarket, custom fuel injection system (megasquirt) running the fuel on my K75, replacing the ancient L-Jetronic. I'm going to add in ignition control this summer (currently, it still uses the stock ignition brain under the steering  head). That's a wideband O2 sensor, that can measure accurately from 10:1 AFR to Free air, though in the current setup, it can only measure to 20:1, which is more than sufficient for tuning purposes. A normal O2 sensor only does above or below stoichiometric (14.7:1).