Secondary Air Filter

R6L8ver · 02-01-2008, 04:21 PM

I just joined this forum today with the purpose of improving HP and gas mileage on my 99 2.7 Tacoma. I read somewhere about taking out the secondary air filter. I have a few questions:

What is that?
Where is it?
How do I take it out?
Will it affect anything negatively?
What is it supposed to help?
What else can I do to improve MPG's and HP?

I'm not even really worried about HP, otherwise I wouldn't have bought a 2.7 Tacoma. My father-in-law is an Amsoil dealer, so I just switched over to Amsoil oil and filters and I've consciously dropped my speed by about 10mph on the highway and I'm not really seeing much of a difference. Right now, I'm getting about 19.5mpg which I don't think is that great for a 4 cylinder. Everyone asks me what mpg I get and they're all suprised with the usual response being "Wow, I'd have thought you'd have gotten better mileage out of a small enging like that". ME TOO!! I searched quite a bit and found information on the newer trucks in the 1st Gen forum, but couldn't find much about my 99. Any help would be appreciated.

Roland · 02-01-2008, 04:27 PM

I'm pretty sure you don't have the secondary filter. It was added to appease the tree huggers starting with the 2005 model.

R6L8ver · 02-01-2008, 04:30 PM

yeah, I was looking around and i guess I asked before I read up...still a newb on this.

Janster · 02-02-2008, 06:25 AM

Quote:

Originally Posted by R6L8ver

yeah, I was looking around and i guess I asked before I read up...still a newb on this.

Yeah, only 2005+ models.

Just an FYI for anyone else to read the thread...

It's a thin filter (reminds me of a fishtank filter) with carbon stuff in it I think. It's like 1/4" thick (if I had to guess) and mounts inside the airbox in front of (engine side) of the air filter.

I took mine out.

concrete jedi · 02-02-2008, 07:45 AM

Quote:

Originally Posted by Roland

I'm pretty sure you don't have the secondary filter. It was added to appease the tree huggers starting with the 2005 model.

I resemble that remark, but me and my tree are friendly, there is plenty of room over here, I'll save you a seat.

concrete jedi · 02-02-2008, 07:46 AM

Oh by the way my favorite tree is a Norwegian spruce.

Roland · 02-02-2008, 09:08 AM

My contribution to the "green" movement is sailing. Wind moves us and solar powers us so my total fuel use is less than 15 gallons a year for 6 months of fun on a 35 ft boat!

02-01-2008, 04:21 PM	#1
R6L8ver Junior Member Joined: Feb 2008, #4526 Posts: 5 Shortbed, Regular Cab, 4X4 1999 Regular Cab Automatic	Secondary Air Filter I just joined this forum today with the purpose of improving HP and gas mileage on my 99 2.7 Tacoma. I read somewhere about taking out the secondary air filter. I have a few questions: What is that? Where is it? How do I take it out? Will it affect anything negatively? What is it supposed to help? What else can I do to improve MPG's and HP? I'm not even really worried about HP, otherwise I wouldn't have bought a 2.7 Tacoma. My father-in-law is an Amsoil dealer, so I just switched over to Amsoil oil and filters and I've consciously dropped my speed by about 10mph on the highway and I'm not really seeing much of a difference. Right now, I'm getting about 19.5mpg which I don't think is that great for a 4 cylinder. Everyone asks me what mpg I get and they're all suprised with the usual response being "Wow, I'd have thought you'd have gotten better mileage out of a small enging like that". ME TOO!! I searched quite a bit and found information on the newer trucks in the 1st Gen forum, but couldn't find much about my 99. Any help would be appreciated.

02-01-2008, 04:27 PM	#2
Roland My other ride has sails Joined: Jan 2008, #4149 Location: Rhode Island Age: 45 Gender: Male Posts: 2,042 06 Impulse Red I4 2WD Access Cab 2006 Access Cab Manual 2.7 UnderCover Tonneau, Bed mat, Bug Deflector, aFe Pro Dry S, Secondary Air Filter removed, Synthetic 5W-30 oil, Scanguage II with blendmount, WeatherTech floorliners, Toyota seat covers, Installed OEM intermittent wipers, TacomaWorld sticker, Defrost without AC mod, Hidden Hitch	I'm pretty sure you don't have the secondary filter. It was added to appease the tree huggers starting with the 2005 model. __________________ "Life's journeys End is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy shit what a ride!"

02-02-2008, 09:08 AM	#7
Roland My other ride has sails Joined: Jan 2008, #4149 Location: Rhode Island Age: 45 Gender: Male Posts: 2,042 06 Impulse Red I4 2WD Access Cab 2006 Access Cab Manual 2.7 UnderCover Tonneau, Bed mat, Bug Deflector, aFe Pro Dry S, Secondary Air Filter removed, Synthetic 5W-30 oil, Scanguage II with blendmount, WeatherTech floorliners, Toyota seat covers, Installed OEM intermittent wipers, TacomaWorld sticker, Defrost without AC mod, Hidden Hitch	My contribution to the "green" movement is sailing. Wind moves us and solar powers us so my total fuel use is less than 15 gallons a year for 6 months of fun on a 35 ft boat! __________________ "Life's journeys End is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy shit what a ride!"

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02-01-2008, 04:30 PM	#3
R6L8ver Junior Member Joined: Feb 2008, #4526 Posts: 5 Shortbed, Regular Cab, 4X4 1999 Regular Cab Automatic	yeah, I was looking around and i guess I asked before I read up...still a newb on this.

02-02-2008, 07:46 AM	#6
concrete jedi Senior Member Joined: Oct 2007, #3142 Location: Rochester N.Y Age: 43 Posts: 2,507 06 Tacoma 4 door indigo blue 2006 Double Cab Manual V-6 4.0 liter Broken and scratched tailgate, cracked rear tail light lens, coffee stain in driver seat.	Oh by the way my favorite tree is a Norwegian spruce.