Catalytic converter cleaning
Senior Member
Joined: Jul 2012
Posts: 9,014
From: C-Town
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Senior Member
Joined: Apr 2019
Posts: 854
From: Albuquerque NM
Interesting looks like the old Spark plug extender, didn't know it was the same profile as on O2 sensor!
Funny, I see the wheels tuning, I have a feeling many some H2 Cat's are going to get some internal mods, lol
Funny, I see the wheels tuning, I have a feeling many some H2 Cat's are going to get some internal mods, lol
Senior Member
Joined: Jul 2007
Posts: 831
From: Pacific NW
Thanks Hummerz.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
Senior Member
Joined: Jul 2012
Posts: 9,014
From: C-Town
Thanks Hummerz.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
Super Moderator
Joined: Jul 2007
Posts: 13,101
From: Boat Town USA MI
Thanks Hummerz.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
So just by installing that spacer on the downstream O2 sensor, that somehow eliminates the O2 sensor from throwing a code even when there is no catalyst charge in the catalytic converter?
1. Does anyone know how exactly that happens, in a chemical sense? Without catalyst, the downstream O2 sensor should be seeing too much O2 (as a result of unburnt fuel) and trip a code, right? How does the spacer "reduce" the amount of O2 that the sensor is seeing? Am I looking at this correctly?
2. Also, does lower back pressure (due to no catalyst) throw a code, or make the engine run WORSE? Engines need a certain amount of back pressure to work correctly.
I would love to yank out the cats. Pollute more per gallon used, but use less gallons. And get more power. Looks like a win to me.
2) There is still restriction in the muffler/resonator. Restriction did not go to zero and what the engine is looking for and knows can be adjusted with HP Tuners etc...
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Senior Member
Joined: Apr 2019
Posts: 854
From: Albuquerque NM
So much for the test pipes,
Years ago you used to be able to purchase a H2 dual cat delete pipe setup for off road and test purposes but no more...
I guess if you still could you and were having problems with clogged cats you could just pull the dual cat assembly, install your delete pipe, install a downstream O2 sensor spacer and you would be good to go (as long as you live where inspections are not necessary)
I guess if you still could you and were having problems with clogged cats you could just pull the dual cat assembly, install your delete pipe, install a downstream O2 sensor spacer and you would be good to go (as long as you live where inspections are not necessary)