Cats r cut off. How to create dummy o2 sensor.

[SunlitComet]

funny there was no mention of off-road only i think. besides the basic principal still stands: in short you f***things up when you tamper with that system. it only makes the engine run worse.

 

[1998Suburban]

How about an oxygen sensor simulator? Would keep the PCM happy:

http://www.afterthoughtsauto.com/o2sim.html

 

[Gzes]

Your thinking too hard. Just a non fouler will do dirt cheap aswell. Hell my prelude has a test pipe o2 is in fine no codes thrown

 

[saif najd]

Ok , now what is the type of connector for the rear sensors?



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[pmackiniv]

Front o2 sensors are what affect fuel misture, rear 02's monitor if cats are working. Can either get them tuned out with a PCM tune, spark plug foulers, or try what a kid in my class did and use zener diodes. His idea was to wire in a zener diode that would ground out extra voltage so the voltage going to computer would simulate a properly running catalytic converter.

Not sure if he was blowing smoke but when I drove his Tahoe there was no SES light. He had true dual straights with no cats

What are Zener diodes, and how could they be used to fix the issue?


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---------- Post added at 12:37 PM ---------- Previous post was at 12:30 PM ----------

Would I install the non fouler a in the rear sensors? I'm gonna give it a try, if I can get hold of good enough instructional video.


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[Javie]

Your thinking too hard. Just a non fouler will do dirt cheap aswell. Hell my prelude has a test pipe o2 is in fine no codes thrown

Ik now this is old but wondering if your non fowlers worked if so are they the 18 mm size?

 

[exp500]

Javie- correct, !8mm for this vintage.
Pmac- Zener diode swap in is a ford trick, doesn't seem to work reliably in this vintage GM. 50/50 results. cheap though. So are non foulers, except for the platinum ones that work for a week.
Sunlit- Glad to see you back on the board more, your input always welcome by me.