Non cat exhaust CEL?

[largeorangefont]

Originally Posted by jouslee

Yea, looking at the diagram it seems like the front two are pre-cats, I'm not quite sure what they do in the yaris but on the 86-91 Rx-7's (They also had a 3 stage cat system) they would act like combustion chambers to burn the excess hydrocarbons that were thrown out by the engine.

The precats are for when the engine is cold.

[CASTREX]

Originally Posted by largeorangefont

The precats are for when the engine is cold.

What could be a down side of removing all 3 stages of the cat on a Yar??

What is going to happen when the engine is cold and there are no pre-cats?

Besides de CEL and of course the non-legal exhaust?

A loss of torque could be expected or something like that?

[largeorangefont]

Originally Posted by CASTREX

What could be a down side of removing all 3 stages of the cat on a Yar??

What is going to happen when the engine is cold and there are no pre-cats?

Besides de CEL and of course the non-legal exhaust?

A loss of torque could be expected or something like that?

You'll gain a couple HP, some smell, and a CEL unless you use a CEL fix of some sort on the sensor.

[CASTREX]

Well.... looks like my cat is going down in a couple of weeks.