Non cat exhaust CEL? - Toyota Yaris Forums

CASTREX · 01-10-2007, 06:48 PM

Question. Any one knows if the Yaris will throw a CEL if I take off the cat? If it does, is there a way to go around that CEL?

Black Yaris · 01-10-2007, 06:58 PM

wich cat and how many of them do you plan on removing?

Black Yaris · 01-16-2007, 07:42 PM

There are 2 pre-cats and a regular cat on our Yarii

eco · 01-16-2007, 08:59 PM

Yep,3 stage cat.confirmed,hey its even in the manual.I am also thinking of fooling the sensors aswell,I am waiting for some links.

elsteverino889 · 01-16-2007, 09:13 PM

Quote:

Originally Posted by eco

Yep,3 stage cat.confirmed,hey its even in the manual.I am also thinking of fooling the sensors aswell,I am waiting for some links.

eco is gay dont listen to him!

Black Yaris · 01-17-2007, 01:07 AM

Quote:

Originally Posted by elsteverino889

eco is gay dont listen to him!

good one elsteverino

, I am sure his sexual preferance and/or his happiness has nothing to do with his ability to confirm the Yaris has a 3 stage cat. If you were to choose to not listen to him, you would be ignoring correct information that you may want to use in the future.

jouslee · 01-25-2007, 11:25 AM

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.

largeorangefont · 01-26-2007, 10:38 AM

Quote:

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 · 01-26-2007, 02:50 PM

Quote:

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 · 01-26-2007, 11:21 PM

Quote:

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 · 01-28-2007, 01:22 PM

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

01-10-2007, 06:48 PM	#1
CASTREX Who said Yaris was slow? View User's Garage Drives: Yaris T-Sport 2008 Join Date: Nov 2006 Location: Costa Rica Posts: 1,287	Non cat exhaust CEL? Question. Any one knows if the Yaris will throw a CEL if I take off the cat? If it does, is there a way to go around that CEL?

01-10-2007, 06:58 PM	#2
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	wich cat and how many of them do you plan on removing? __________________

01-16-2007, 07:42 PM	#3
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	There are 2 pre-cats and a regular cat on our Yarii __________________

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01-16-2007, 08:59 PM	#4
eco Drives: 2007 Black Yaris sedan Join Date: Sep 2006 Location: Atlanta Posts: 884	Yep,3 stage cat.confirmed,hey its even in the manual.I am also thinking of fooling the sensors aswell,I am waiting for some links.

01-25-2007, 11:25 AM	#7
jouslee Drives: White 2007 2 Door hatch Yaris Join Date: Jan 2007 Location: Rowland Heights, CA Posts: 22	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.

01-28-2007, 01:22 PM	#11
CASTREX Who said Yaris was slow? View User's Garage Drives: Yaris T-Sport 2008 Join Date: Nov 2006 Location: Costa Rica Posts: 1,287	Well.... looks like my cat is going down in a couple of weeks.