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California Emissions hack

Offroadshowtruck

Offroadshowtruck

New Member
Joined
Dec 27, 2020
Messages
6
Location
CA
Has anybody ever wanted to get their catalytic converters gutted in California and still be able to pass smog.. well friends I did it not to mention did it and passed the flying colors as well as left my chip my super chip f5 flash pack set on my performance setting and I didn't have to do any funny program or any type of o2 sensor delete or anything. Let me start this thread off by saying that I have a 2005 Chevy avalanche 6 in of lift 37s inch tires rcd lift with King shocks oh yeah with a cat delete dark horse racing headers and a 3-in exhaust to a 10 series flowmaster with 50 state legal k&n fipk intake. Okay so California's gas sucks and it is hell on catalytic converters and at the time my catalytic converters had gone bad my truck was running like crap and I didn't have the money to take it to a shop or buy new catalytic converters so a little magic fairy AKA oxyacetylene torch . Unbolted the exhaust from the back of the headers made a small incision around the weld on the top side of my cat and proceeded to get all the crap out of the center of it (FYI don't try to recycle the stuff inside the cat you could get in trouble) anyways once both my cats were clear I simply made marks where I had took them apart on each side and then line those marks back up and put a nice weld back around the top for the o2 sensors the downstream or the ones closest to the back of the truck I simply used a spark plug gap Fowler but you can actually buy o2 simulators for 15 bucks a piece either way is up to you and it's as simple as installing the o2 sensor simulators install the o2 sensors back on top of the simulator and then take it to the smog shop it will not throw a check engine light still hasn't every part that I've listed besides the cat delete is completely a hundred and ten percent legal and the reason why I just left the catalytic cans instead of just putting a pipe in there is simply because when they do their visual inspection it will pass now I know there's a lot of people out there that are just going to say you can't do that can't do this that's not right and I agree but my truck produces more power noticeable power and I don't have to worry about California gas messing up my catalytic converters and if you've ever bought a California's compliant catalytic converter you know that they run about 450 bucks a piece so this is just simply a little bit of information some free horsepower and doesn't take a lot of time or money hope this helps everybody out
 
Another reason I'm glad I live where I do.

No smog checks.

:) (y)
 
yes some have deleted their cats... See older threads.

Deleting CATS is not a good thing to do for street cars and trucks IMHO.
 
A modern version of the old check ball in the EGR vacuum hose trick. If you don't understand the system, just disable it.

I'm surprised the mods here allow posts about defeating emissions on vehicles driven on the street.
 
2004Slickside said:
A modern version of the old check ball in the EGR vacuum hose trick. If you don't understand the system, just disable it.

I'm surprised the mods here allow posts about defeating emissions on vehicles driven on the street.
Click to expand...
We do not recommend this mod but we agree it can be discussed without personal attacks,

So if you think it is wrong say so... I already have
 
OK. I think it is wrong. Better to fix the reason for a catalytic converter failure. Typically misfires or running out of the AFR specification generating too much heat.
 
Just like one guy posted some places don't get emissions testing. Being salty because someone found an alternative that you may not agree with isn't right. So deleting or bypassing said system is up to the owner no matter where they live. Wether it's driven on the street or not i don't see the problem. If the "boy scouts" who want to keep wasting their money on repairing or replacing parts that don't have any bearing on the vehicle other than to be emission compliant then so be it. For the MacGyver who found away around it and saved some money and didn't do anything but hurt someone's feelings. Congrats and keep up the good work.
 
My argument is that he is only covering up a problem that is still there, and not fixing it. Are you saying that ignoring misfires or being too rich/lean is an acceptable fix?
 
He bypassed the second o2 sensor which is only there to show that the converter is doing it's job for emissions. The first o2's affect the fuel mixture and in turn would Make it throw a code. As for misfires that would also throw a code and the converter has no effect on that. Emissions are just that and have no effect on how the engine runs just to make the tree huggers happy.
 
You might want to think about why the converter would stop doing it's job. It's just the last move in a chess game of problems. An effect, not a cause. I'm done with this.
 
2004Slickside said:
A modern version of the old check ball in the EGR vacuum hose trick. If you don't understand the system, just disable it.

I'm surprised the mods here allow posts about defeating emissions on vehicles driven on the street.
Click to expand...
Hey I go off road in my snowflake
 
Midwestmk2 said:
Just like one guy posted some places don't get emissions testing. Being salty because someone found an alternative that you may not agree with isn't right. So deleting or bypassing said system is up to the owner no matter where they live. Wether it's driven on the street or not i don't see the problem. If the "boy scouts" who want to keep wasting their money on repairing or replacing parts that don't have any bearing on the vehicle other than to be emission compliant then so be it. For the MacGyver who found away around it and saved some money and didn't do anything but hurt someone's feelings. Congrats and keep up the good work.
Click to expand...
Hey thanks man from one gearhead to another that really means a lot to a guy like me and if ever ya have any cool things to tell me or any questions about all my other hacks please feel free to email me at urunnecessaryroughness@gmail.com thanks for the compliment
 
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