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

[pmackiniv]

I have my cats coletely cut out, and I've heard rumors that there might be a way to trick the o2 sensor into making it believe everything is normal to keep the engine from running so rich. I always have to wait a bit when I first start up the truck for it to run somewhat smoother. If it's not the o2 sensor causing a performance problem, I was going to look into vacuum leaks. I also installed a cold air intake, some have said that May not be helping my case either. Open to all suggestions. Thanks.

 

[83 Bimmer]

it's not the rear oxygen sensors causing the problem, their only purpose is to check to make sure the converters are working properly. Are there any other fault codes stored in the computer besides the converter codes?

What kind of shape is your ignition system in?

Is the intake installed properly with the MAF?

Do you still have the factory fuel injectors or the updated injectors?

 

[pmackiniv]

If the MAF. Was installed backwards, would it still work?


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[saif najd]

I don't have the cats and yes I am getting this codes (p0430 and p0420) I am looking for a solution too

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[pmackiniv]

it's not the rear oxygen sensors causing the problem, their only purpose is to check to make sure the converters are working properly. Are there any other fault codes stored in the computer besides the converter codes?

What kind of shape is your ignition system in?

Is the intake installed properly with the MAF?

Do you still have the factory fuel injectors or the updated injectors?

I still got factory injectors. What would you suggest for upgrading injectors?


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[SunlitComet]

yes. and i have said it once and i will say it again. the rear sensors do play a minor role in effecting the fuel trims to ensure that the cats work the best they can to a certain degree.

 

[saif najd]

Honda owners have a way which is to place the rear Ox sensors away from its original place by using L shape steel tube so smoke well be way less than now

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[Gzes]

Yep a non fouler will help you

 

[83 Bimmer]

sounds like to me your running problem could be caused by either something going on with your ignition system or you might even have a leaky injector that's flooding out one cylinder over night and making it misfire for a while upon first startup.

as far as the cats go the cheapest and easiest way is to use a spark plug non fouler, you can search on google and find out exactly how to do it. Technically speaking though tampering with your emissions equipment especially the converters and oxygen sensors is illegal, if you get caught or not is a different story. Do it at your own risk

 

[pmackiniv]

sounds like to me your running problem could be caused by either something going on with your ignition system or you might even have a leaky injector that's flooding out one cylinder over night and making it misfire for a while upon first startup.

as far as the cats go the cheapest and easiest way is to use a spark plug non fouler, you can search on google and find out exactly how to do it. Technically speaking though tampering with your emissions equipment especially the converters and oxygen sensors is illegal, if you get caught or not is a different story. Do it at your own risk

I'm gonna try cleaning out the MAF first along with a non fouler to start. Injectors are super expensive for me right now. Those other two options are well worth giving a try. I appreciate the help man.


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[SunlitComet]

Or you can not violate federal EPA law and put the proper converters back on. besides removing them just causes more performance issues. it effects your powerband in a negative way.

 

[saif najd]

I am not violating any laws and I couldn't find any new in the local market

So can we proceed?



The beauty of the 3rd world's


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[ccapehartusarmyINF.(ret)]

the front o2 sensors handle mixture the rear basically make sure the cats are working
to explain it better your vehicle pcm starts in open loop mode this basically ignores any siginal from the front o2 sensor and your pcm runs a rich mix untill the vehicle warms up to proper temp then it goes into closed loop and starts accepting signal from the o2 sensor to adjust the mix properly

 

[SunlitComet]

I am not violating any laws and I couldn't find any new in the local market

So can we proceed?



The beauty of the 3rd world's


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well aren't you special.

---------- Post added at 08:41 PM ---------- Previous post was at 08:31 PM ----------

the front o2 sensors handle mixture the rear basically make sure the cats are working
to explain it better your vehicle pcm starts in open loop mode this basically ignores any siginal from the front o2 sensor and your pcm runs a rich mix untill the vehicle warms up to proper temp then it goes into closed loop and starts accepting signal from the o2 sensor to adjust the mix properly

popular misconception and not accurate, entering closed loop is not engine temperature dependent. heated oxygen sensors are used because they can heat up faster and activate to provide mixture feedback. once activation temperature of the sensors have been reach it will enter closed loop mode. while coolant temp can effect change in the mixture it is not simply rich or lean, it can change it to anything in between.

 

[Gzes]

Cats are over rated... Well not my guy he just likes to sleep and go outside

 

[SunlitComet]

mine are underestimated.

 

[retorq]

LOL Removing cats causes negative performance issues ... someone better tell all the guys at the race track to put some back on so they can perform better.

Guys with cats ... you need to turn in your man cards hahahaha

 

[autolover3]

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

 

[SunlitComet]

again, the rear sensors do have an effect on the fuel trim. put the proper parts in there and stop trying to screw with your emissions system.

 

[saif najd]

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

True he is right that is my idea too, after studying how the O2 rear signal emulator works, it is the same the idea is it send or respond to the ECU so if we found away to figure how it should respond and do it then it well be solved

Sun: our talk is for off road use only and other countries (don't have emission laws)

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