Hummm can't remember offhand but there are posts on here for using one. Try going to google and putting in spark plug adapter and the + sign and add fitfreak.net at the end so it will search this site.

 

Alright man!!!!!!!

 

Experience. It doesn't take much to burn up a cat. I've seen anywhere from water down fuel burn up cats, to octane boosters, leaking injectors... The liquid in the cat and high temps will destroy the cat.

 

The spark plug adapter spacer method is for people who removed the precats, it's got nothing to do with his mods. He said stainless steel "intake" which has no relation to the cat. Now if he were to install say a T1R cat delete pipe then I understand why he has a P0420 code because it doesn't detect a cat. The spacer simply moves the secondary oxygen sensor out of the main stream to trick it to seeing less exhaust emissions. Seeing that he has nothing really cat related mods this would not explain that code unless cat honey comb is done.

Also he mentioned 95 Ron which is equal to our 91 gas. Reason why is usa gas is R+M /2 which is Ron + Mon octane avg by division of 2.

 

That all depends on the make up of the cat. Some cars use the more expensive platinum catalyst and some cheaper cars use the ceramic brick type. Most American made cars use the ceramic brick type while majority of Japan built cars use metallic bricks that is platinum coated. Not all cats are equal, our cars might be the cheaper ceramic based on price point of our cheap cars even though its mostly made in Japan.

 

Code P0420 is the cat closest to the engine, otherwise known as a precat.

 

Just a couple things.
I'm pretty sure all catalytic converters have platinum. Some oldies had ceramic BBs, some have a ceramic honey comb and some have ceramic coated steel mesh. I think the platinum is bonded to or mixed in the ceramic matrix, whatever shape it is.

Fooling the downstream O2 sensor is done with spark plug defoulers.
Back in the day, spark plugs would oil foul, especially in small engines. Rather then do a valve job etc. you could buy bushings that the spark plug would screw into and then it, with spark plug, would screw into the head. There was a small hole in the tip of the defouler to let the air/fuel near the arc of the plug but not oil mist.
You buy a set (2) and drill one out so that the bulb of the O2 sensor will fit inside. You then screw the O2 sensor and the defoulers together and thread the whole thing into the bung hole behind the cat. The little hole doesn't allow enough of the exhaust stream past the O2 sensor for ions to pass through the platinum/palladium tip into the sensor wire. No rich/lean swing = cat ok.

High octane fuel isn't going to fizzle out in a low compression engine. "Octane" is used to rate a fuels resistance to pre-ignition. The actual burn is no different for 89 or 98 octane.
Anyway, These little L series engines have 10:1 compression or more, don't they?

Last thing. If OP is talking about one of those air filters that you spray silicon oil all over, that definitely can deactivate O2 sensors and catalysts.

 

AH dude the subject of that post was higher octane not being good for an engine not burning up cats. And more BS about "needing" higher compression. And both are simply NOT TRUE.

and a ps for you the Singapore equivalent of 95 octane is the USA 93 so there is nothing to worry about.

 

Anyway i only change buddyclub throttle body and a muffler

Those mods in conjunction with each other HAVE caused MILs in other members cars.