Air filter,primary and secondary - Toyota Yaris Forums

floydisrock · 07-24-2009, 12:22 PM

Anyone replace the primary and secondary air filters?
Anyone have the mileage interval?
I ordered some wix secondaries,but the primary's seem mighty expensive.

Kaotic Lazagna · 07-24-2009, 02:02 PM

Primary and secondary? Do you mean the carbon trap?

Yaris Hilton · 07-24-2009, 02:33 PM

What?

WolfWings · 07-24-2009, 02:35 PM

Yeah... the Yaris only has one air filter for the engine, and one for inside the A/C in the cabin. There's no primary or secondary to it, just one filter for each entirely-seperate purpose. And both are bone-simple to change and cheap as dirt.

floydisrock · 07-24-2009, 02:44 PM

http://www.car-stuff.com/store/?N=11...725+11921+9157

I guess I ordered 4 wix primary filters at about $10 each.
I kept running into the listing for secondary filters,and couldn't figure out what they were talking about.
I'm guessing maybe it's the plastic cover?
The filter comes out easily,but I imagine it's easy to crack the hinge/housing.
Just a heads up.

Yaris Hilton · 07-24-2009, 02:50 PM

I haven't looked in my air box yet. I've seen filters before that had a foam filter to catch the bulky coarse dirt before the air goes through the finer paper filter that removes the smaller dirt particles but clogs faster.

BLH · 07-24-2009, 07:14 PM

The break down on ToyoDIY.com actually shows a sub filter in the top of the housing.
I never even looked in the top part for a second filter.

CTScott · 07-24-2009, 09:37 PM

The part shown on ToyoDiy is a white mesh filter that is probably there to keep anything that gets freed up when the filter is changed from making it to the MAF sensor. The EPC doesn't show it as being a separate part from the air box, so it is probably not intended to ever be replaced.

b_hickman11 · 07-26-2009, 06:51 PM

It's called a Carbon Trap.

RedRide · 08-25-2009, 08:13 PM

I just replaced my air filter with a K&N.

I must admit that I'm a bit piuzzled by this secondary fillter.
I could understand if airflow was from top to bottom as it would keep anthing from "falling" into the intake.

However, since air flow is from bottom to top, it doesn't make much sense to me.
What is ment by it being a "carbon trap"?

eric81 · 08-25-2009, 09:28 PM

Carbo trap keeps stuff from going into the engine that doesn't belong, and stuff from leaving the engine the wrong way. Pointless, IMO. I took mine out right away, and had no problems. Take yours out, and try blowing through it. It's kinda hard. Now, imagine your engine going through that same strain. The less work the engine does to create power, the more power it has to put to the ground.

RedRide · 08-25-2009, 11:06 PM

Quote:

Originally Posted by eric81

Carbo trap keeps stuff from going into the engine that doesn't belong, and stuff from leaving the engine the wrong way. Pointless, IMO. I took mine out right away, and had no problems. Take yours out, and try blowing through it. It's kinda hard. Now, imagine your engine going through that same strain. The less work the engine does to create power, the more power it has to put to the ground.

Isn't that what the "main" air filter is for? If the air filter is filtering as it's designed to do, what is the purpose of the secondary?

I agree that it limits air flow. Perhaps that's precisely what it's for?
Maby it's part of toyta's "tuning" to limit performance to increase MPG?

YarisSedan · 08-25-2009, 11:51 PM

I think its there just as a precation. Which is why you have a noticible difference swapping to a performance intake verses stock. Because there is so much restriction to begin with.

RedRide · 08-26-2009, 12:20 PM

Ok.... I just came from the Toyota dealer. I got my initial oil change using the VIP card they gave me. They are right down the road and have been changing the oil on my Celica for years. With a cupon it's realtively cheap also.

Anyway, I just happen to run into the service manager and I asked him about the purpose of the secondary air filter.

Now, he has been there for years (a major dealer in the NE) and we have had a few conversations in the past.
However, as far as the secondary filter, he admitted to me that he really didn't have clue about its purpose.

When I ran by him the things I heard it might be for (carbon trap etc) he when on to say that he has heard all that but, he has never heard or read anything official from Toyota to indicate what it was for and as far as he knows, it has nothing to do with emissions, etc as some suspect.

So, the mystery continues.

BTW, the K&N filter definately made a dfference in throttle response and is well worth it.

b_hickman11 · 08-26-2009, 01:07 PM

Quote:

Originally Posted by eric81

Carbo trap keeps stuff from going into the engine that doesn't belong, and stuff from leaving the engine the wrong way. Pointless, IMO. I took mine out right away, and had no problems. Take yours out, and try blowing through it. It's kinda hard. Now, imagine your engine going through that same strain. The less work the engine does to create power, the more power it has to put to the ground.

More Power=Lower MPG

RedRide · 08-26-2009, 02:38 PM

Quote:

Originally Posted by b_hickman11

More Power=Lower MPG

Exactly my point in a previous post.
I suspect its only purpose is to increase MPG.

RedRide · 08-26-2009, 02:55 PM

I just found this and it seems to shed some light on the matter:
A C&P---

".....;I have to rant...I love how everyone calls the carbon filter a "secondary air filter" even though it's not an air filter at all. It just keeps gas fumes from leaving the engine and adding to pollution. Those fumes get trapped in the carbon and then sucked back into the engine when you start it back up. So by removing the carbon filter, everyone's just venting those fumes into the atmosphere instead of using them when the engine is running. Might as well leave the gas cap off too. Personally, when I pay for all that gas I like to use it in running the engine rather than just letting it evaporate into the air."

I then read that this was done mainly to apease Califorinia's stricker emissions standards.

If all this is true, removing it will do no harm and will not effect emissions tests, except maby in California.

Kaotic Lazagna · 08-26-2009, 03:09 PM

So would it really be worth it to remove it and cause more pollution? I doubt it that it would cause a noticeable power increase.

07-24-2009, 12:22 PM	#1
floydisrock 73 Centurion droptop 455 Drives: 2009 S Sedan Join Date: Oct 2008 Location: Phoenix Arizona Posts: 64	Air filter,primary and secondary Anyone replace the primary and secondary air filters? Anyone have the mileage interval? I ordered some wix secondaries,but the primary's seem mighty expensive. __________________ "THIS SITE HAS BEEN HACKED BY www.bimmerfest.com. YOU FUCKERS!"

07-24-2009, 02:35 PM	#4
WolfWings View User's Garage Drives: Silver 2007 3Dr - Gryph Join Date: Jul 2007 Location: Kansas City, MO, USA Posts: 310	Yeah... the Yaris only has one air filter for the engine, and one for inside the A/C in the cabin. There's no primary or secondary to it, just one filter for each entirely-seperate purpose. And both are bone-simple to change and cheap as dirt. __________________

07-24-2009, 02:44 PM	#5
floydisrock 73 Centurion droptop 455 Drives: 2009 S Sedan Join Date: Oct 2008 Location: Phoenix Arizona Posts: 64	http://www.car-stuff.com/store/?N=11...725+11921+9157 I guess I ordered 4 wix primary filters at about $10 each. I kept running into the listing for secondary filters,and couldn't figure out what they were talking about. I'm guessing maybe it's the plastic cover? The filter comes out easily,but I imagine it's easy to crack the hinge/housing. Just a heads up. __________________ "THIS SITE HAS BEEN HACKED BY www.bimmerfest.com. YOU FUCKERS!"

08-25-2009, 11:51 PM	#13
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	I think its there just as a precation. Which is why you have a noticible difference swapping to a performance intake verses stock. Because there is so much restriction to begin with. __________________ http://www.cardomain.com/ride/3210549

08-26-2009, 12:20 PM	#14
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	Ok.... I just came from the Toyota dealer. I got my initial oil change using the VIP card they gave me. They are right down the road and have been changing the oil on my Celica for years. With a cupon it's realtively cheap also. Anyway, I just happen to run into the service manager and I asked him about the purpose of the secondary air filter. Now, he has been there for years (a major dealer in the NE) and we have had a few conversations in the past. However, as far as the secondary filter, he admitted to me that he really didn't have clue about its purpose. When I ran by him the things I heard it might be for (carbon trap etc) he when on to say that he has heard all that but, he has never heard or read anything official from Toyota to indicate what it was for and as far as he knows, it has nothing to do with emissions, etc as some suspect. So, the mystery continues. BTW, the K&N filter definately made a dfference in throttle response and is well worth it. Last edited by RedRide; 08-26-2009 at 01:02 PM.

07-24-2009, 02:02 PM	#2
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	Primary and secondary? Do you mean the carbon trap?

07-24-2009, 02:33 PM	#3
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	What?

07-24-2009, 02:50 PM	#6
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	I haven't looked in my air box yet. I've seen filters before that had a foam filter to catch the bulky coarse dirt before the air goes through the finer paper filter that removes the smaller dirt particles but clogs faster.

07-24-2009, 07:14 PM	#7
BLH Drives: 2007 Yaris Sedan Join Date: Apr 2009 Location: CT Posts: 271	The break down on ToyoDIY.com actually shows a sub filter in the top of the housing. I never even looked in the top part for a second filter.

07-24-2009, 09:37 PM	#8
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The part shown on ToyoDiy is a white mesh filter that is probably there to keep anything that gets freed up when the filter is changed from making it to the MAF sensor. The EPC doesn't show it as being a separate part from the air box, so it is probably not intended to ever be replaced.

07-26-2009, 06:51 PM	#9
b_hickman11 Drives: 08 Sedan Join Date: Oct 2008 Location: Tyler, TX Posts: 899	It's called a Carbon Trap.

08-25-2009, 08:13 PM	#10
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	I just replaced my air filter with a K&N. I must admit that I'm a bit piuzzled by this secondary fillter. I could understand if airflow was from top to bottom as it would keep anthing from "falling" into the intake. However, since air flow is from bottom to top, it doesn't make much sense to me. What is ment by it being a "carbon trap"?

08-25-2009, 09:28 PM	#11
eric81 View User's Garage Drives: Toyota Salesman Join Date: Nov 2008 Location: Clarksville, IN Posts: 297	Carbo trap keeps stuff from going into the engine that doesn't belong, and stuff from leaving the engine the wrong way. Pointless, IMO. I took mine out right away, and had no problems. Take yours out, and try blowing through it. It's kinda hard. Now, imagine your engine going through that same strain. The less work the engine does to create power, the more power it has to put to the ground.

08-26-2009, 02:55 PM	#17
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	I just found this and it seems to shed some light on the matter: A C&P--- ".....;I have to rant...I love how everyone calls the carbon filter a "secondary air filter" even though it's not an air filter at all. It just keeps gas fumes from leaving the engine and adding to pollution. Those fumes get trapped in the carbon and then sucked back into the engine when you start it back up. So by removing the carbon filter, everyone's just venting those fumes into the atmosphere instead of using them when the engine is running. Might as well leave the gas cap off too. Personally, when I pay for all that gas I like to use it in running the engine rather than just letting it evaporate into the air." I then read that this was done mainly to apease Califorinia's stricker emissions standards. If all this is true, removing it will do no harm and will not effect emissions tests, except maby in California.

08-26-2009, 03:09 PM	#18
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	So would it really be worth it to remove it and cause more pollution? I doubt it that it would cause a noticeable power increase.

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