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Old 07-22-2018, 10:47 AM #1
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Secondary Air Pump Mod Validity
I was doing some research on the failures Toyota owners have experienced with the secondary air injection pump and came across the thread below. I wanted to see if any 4Runner owners have done this as well and whether it’s actually effective. I’m planning on doing this mod after the warranty expires but just wanted to see what all of you experts thought about it.

https://www.metaltech4x4.com/blog/le...d-the-unimod-/
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Old 07-22-2018, 11:06 AM #2
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You've got my attention. I'd definitely try it. Can't see why it wouldn't work... But I haven't really looked at the pump in the 4runner yet. I'm gonna check it out.
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Old 07-22-2018, 11:44 AM #3
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interesting...
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Old 07-22-2018, 11:47 AM #4
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It would work just fine. Most car companies just pipe the secondary air pump to pull filtered air from the engine air box.

The only thing your loosing with this setup with the external filter is water resistance.
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Old 07-22-2018, 05:23 PM #5
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Agent you bring up a good point, in the event you were fording water you would run the risk of water entering through there. I’m wondering if the original filter element can be replaced?? I still think this is something that the 2013+ runners can use to increase the longevity of the AIP granted that the UNI filter is replaced on a regular basis (yearly).
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Old 07-22-2018, 06:08 PM #6
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I have had one on my 4runner for over a year. This is a well known problem on Tacoma's since they were one of the first victims to receive the crappy air pumps. Any way below are some pics of the one on my 4Runner never mind the air pumps location it has been moved to make room for a couple of other things. The only thing I have noticed is it makes the pump a bit louder as it probably breaths a bit better now.



With the factory cover on. Not worried about ingesting water on mine the truck will be floating before this thing takes in water on so I will have far greater issues....
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Old 07-22-2018, 06:15 PM #7
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@Taco04 thanks for the feedback looks good sir! You’ve been holding out on us for a year huh ;)?
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Old 07-22-2018, 08:05 PM #8
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Yep, this calls for an inspection when I get home.
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Old 07-22-2018, 08:27 PM #9
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Isn't this the air injection pump that only runs at start-up and shut down?

If you're really worried about water, why not run the filter out on some fuel line and mount it on the firewall just under the hood? If you've got water at that height you've got more important problems to worry about.
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Old 07-22-2018, 09:03 PM #10
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I looked at the brand of filter and they're a pretty well known brand for atv and dirt bike filters. They're made of an open cell polyurethane foam. They're oiled like a kn so you just clean them and re oil when necessary.

Not worried about water here. I've read about the success of this modification so I went and ordered the UP-107 filter. $15 on amazon.
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Old 07-22-2018, 09:22 PM #11
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I ordered mine as well.
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Old 07-22-2018, 10:00 PM #12
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seems interesting! ordering one!
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Old 07-23-2018, 01:20 AM #13
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So just to understand why this is done: is basically out of concern that the OEM foam filter will break apart and crumble into the pump impellers??

Is this an actual issue or good marketing? Never heard of such a failure on T4Rs

I'll admit its a tempting mod that looks cool for $15 but doesn't seem like it 'fixes' anything
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Old 07-23-2018, 07:44 AM #14
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When I was shopping last year for a vehicle, I was considering some of the older body style GX460s. I seem to recall some issues those vehicles had with the OEM filter deteriorating and people either removing it completely or putting an aftermarket filter on like this.

I’d forgotten all about it since then and don’t recall anyone having had an issue in the 4Runner. I suspect it is an overblown issue, but I’m interested in hearing others feedback.
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Old 07-23-2018, 07:45 AM #15
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they explain the reasoning in the link, it's to prevent air pump failure by removing the foam filter that degrades and damages the pump
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