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DIY: Secondary Air Filter Removal

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Old 10-08-2013, 10:16 PM   #622
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I removed the "snow filter" off my truck today. I have a 2011 4.0, I just used a knife and razor to cut out the plastic tabs holding it in place. I noticed the engine can breath a lot easier now, Im sure it frees up some hp in the very high rpm. Hopefully it will get some better mpg. I also cleaned my MAF sensor and intake box while I had it all apart. Thinking of getting a drop in high flow filter next.
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Old 10-09-2013, 05:30 AM   #623
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Old 10-09-2013, 08:00 AM   #624
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Cleaning a dirty MAF will help any vehicle. Pulling the secondary will make it only as fassst as you think it will.
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Old 10-24-2013, 05:31 PM   #625
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just did this to my 08 prerunner very easy mod, and im sure after 73000 miles that my truck has it was restricting a little. Im sure I wont notice any gains besides hopefully a couple mpg extra!
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Old 10-25-2013, 07:36 AM   #626
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The only way it might get restricted is if you had K&N type air filter. This is NOT a secondary air filter, it's a carbon trap for gasoline vapors and does nothing for filtration.
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Old 10-25-2013, 12:52 PM   #627
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And of course there will be no extra couple mpg.
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Old 10-25-2013, 06:54 PM   #628
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Quote:
Originally Posted by DonziGT230 View Post
The only way it might get restricted is if you had K&N type air filter. This is NOT a secondary air filter, it's a carbon trap for gasoline vapors and does nothing for filtration.
Turns out the truck had a k&n in it so I went to the dealer today and got a stock filter for 15$
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Old 10-28-2013, 03:25 PM   #629
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So I went through this thread and didn't see anything about this effecting dust getting into the engine as it's just required for emissions. I am considering taking this carbon filter out on my '12 4cyl, and putting it back in when it comes time for me to get smogged.

Anything I need to know?
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Old 10-28-2013, 05:00 PM   #630
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Quote:
Originally Posted by AlexHermsen View Post
So I went through this thread and didn't see anything about this effecting dust getting into the engine as it's just required for emissions. I am considering taking this carbon filter out on my '12 4cyl, and putting it back in when it comes time for me to get smogged.

Anything I need to know?
Why would you want to do it?

It has zero effect on engine performance, and no it doesn't effect dust since your air filter does that.

You will have to break the plastic rivets that hold it in place and then find a way to reattach when emission time comes.

It really is a pointless mod.
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Old 10-28-2013, 08:30 PM   #631
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+1

My truck will probably need smog next year... debating whether to chance it or just buy a new airbox lid.
I really wish I had never popped that thing out.
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Old 10-29-2013, 08:35 AM   #632
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Quote:
Originally Posted by AlexHermsen View Post
So I went through this thread and didn't see anything about this effecting dust getting into the engine as it's just required for emissions. I am considering taking this carbon filter out on my '12 4cyl, and putting it back in when it comes time for me to get smogged.

Anything I need to know?
If you really want it gone I'll trade you for my cover, already cleanly deleted the charcoal filter.
My smog guy is a buddy and won't check it, but if I could go back I'd have left it alone. There is no benefit to removing it and it'll never get dirty and need replacement. There's a minute possibility that leaving it there will help the air filter by blocking the gas fumes from getting to it; probably doesn't matter, but thought I'd throw a positive other than emissions reduction into the mix.
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Old 11-16-2013, 11:08 AM   #633
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lack of power

I just recently removed the secondary filter, replaced plugs, and ran some lucas in the fuel. I still however see a lag in power when trying to accelerate.
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Old 12-01-2013, 03:00 PM   #634
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Have any of you added the K&N 63 cold air system to replace the factory, what about improved MPG.
My 2013 V^ auto is getting 275 per tank- uggg The truck seems to be running great but milage is horrible
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Old 12-01-2013, 06:15 PM   #635
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Intakes don't improve mpg.
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Old 12-26-2013, 11:22 AM   #636
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I am new Tacoma member

I have been getting around 20MPG on 2011 prerunner which is all stock. I went ahead and purchased aFe Pro Dry S air filter. I have been on the fence about removing the second filter. I am in Texas so shouldn't be an issue with emissions test.
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Old 12-27-2013, 05:41 AM   #637
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Can't offer any real thughts on this, my 2013 is TRD is stock and runs great but gets around 14-16? I just bought the K&N and will install this week.
Hoping for a power booast and better mileage
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Old 12-27-2013, 01:24 PM   #638
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Quote:
Originally Posted by Todos Larry View Post
Can't offer any real thughts on this, my 2013 is TRD is stock and runs great but gets around 14-16? I just bought the K&N and will install this week.
Hoping for a power booast and better mileage
people have reported hp losses as recorded by a Dyno from K&N intakes iirc.

ymmv, just throwin that out there.
they also have terrible filtering properties, and ya gotta make sure to keep the oil on the filter to a minimum and clean ur maf sensor regularly.
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Old 01-28-2014, 11:09 AM   #639
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So, I know this thread is about taking of the secondary, but what about replacing it? Mine got a little wet after I went through some deep muddy water, I thought wasn't as deep as it was, and yes I did get out and check the depth but couldn't get to the middle of water.
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Old 01-28-2014, 07:07 PM   #640
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It'll dry out quickly with the air being pulled through it.

I'd be more concerned about water getting into the MAF and other sensors downstream of the filter... or did it get just enough water to dampen it and not flood out?
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