Toyota 4.7 V8 Secondary Air Injection System Bypass (SLYFOX KIT)- 4th Gen 4Runner/Tundra/GX470
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- Опубліковано 8 вер 2024
- In my opinion, this mod is an absolute no brainer for anyone with a Toyota 4.7l V8. That includes 4Runners, Tundras, and GX470s. As many people are finding out, the SAIS (Secondary Air Injection System) can fail and be a very costly repair. In light of this, many kits have been developed to help bypass this system so you aren’t left with a faulty pump or stuck valves. Due to my installation being preventative, I did not have to install block plates, rather just a simple relay bypass. I got my kit from SLYFOX on T4R.org. Jeff was awesome to work with and I am so thankful that his brilliance led us to such a simple fix. Please enjoy!
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I installed a Hewitt Tech gen 1 kit on my 05 Tundra over a 1-1/2 years ago because my truck went into limp mode. The truck runs great and I just passed smog in CA.
Fantastic news. Well done! This is helpful for a lot of those that have questions.
There are lots of these bypass systems this is the most simple there are ones that need Modules added and variable Resistors added and they can get complicated i like how simple thks bypass is
Thanks for this. Going to do my 4.7 4runner this week. Knowing specifically what wire to splice into helps!
Hi John!
You are most welcome. It can be a little intimidating at first, but it’s relatively simple once you put it all together. I’m so glad it helped!
Nice simple Bypass
Where can I buy this kit from?
Will this work if you automatically know that all your system is messed up. according to the codes, I’ve been getting in the way it’s running. Can I put this on and will be back to the way it ran before which was real good?
I would get in touch with SlyFox himself on the T4R forums - I posted his email in response to a few comments.
Where do I get this kit for my 2007 Toyota tundra 4.7 l
SlyFox on the forums! His email is jeffcolemaps@gmail.com
I got 240 thousand trouble free miles on my 4.7. What problem is this so posed to fix. I am going to get Doug Thorley headers in future but interested in what potential issues I might have in future.
Hi Alan! Nice idea with the DT headers - I know a lot of people swear by the updated version.
This mod works to eliminate the secondary air system procedure to ensure the pump doesn’t fail and leave your valves stuck open. It’s a decently common problem in these 4.7s and a costly repair if you don’t catch it early!
Is there a video anywhere of installing the plates people speak of?
I believe so
great informational video
For 100% clarification, this is the 3 valve Gen 2 bypass not the plug and play Gen 2 bypass?
I would reccomend checking in with SlyFox himself as I am not too sure.
I saw height control on your Dash cluster does yours have adjustable height control
I used to with the XREAS that came with the limited!
@@looseaxles awww got ya
Awesome video! Unfortunately I didnt catch mine soon enough and am in limp mode. How/where are these block off plates installed too?
They go within the smaller intake manifolds just beside the valve covers!
@@looseaxles awesome thank you!
Will this happen eventually to every VVTi V8? I have 176k on my 06' 4Runner with no issues. Does the SAIS fail at a certain mileage?
It’s hard to say for sure, but I myself did it as a preventative measure.
If the pump is already bad and it’s making the noise and my check engine light came on today does that mean I have to pull the pump out and clean out the system or can I just put a bypass kit in and clear the codes and call it a day ? ?? 😮😮
Great question. I’d touch base with SlyFox over email to confirm. My guess is that your time would be better spent replacing the system, or seeing if you can install a bypass with block off plates.
Great video 👏 do you have a link for that bypass kit?
Email should be in the comments!
will this work for a 07 Toyota Tundra that is a V6 ?
This particular system is designed for the V8 with the SAIS.
So black/red doesn't matter at all? I'm confused which wire to put on which terminal and then which one to put on which splice side.
It does not matter which way you splice in as the circuit is multi directional! It’s a little counter intuitive for sure.
So all it’s doing is disconnecting the activating wire for the pump while the vehicles running?
It bypasses the pump from opening the valves and keeping them closed. For people that have them stuck open there are block off plates as well.
@@looseaxles Just looking to wire it myself might just be an $8 relay
Would this be good for a v6 4 runner 2006
Shouldn’t need it for a V6!
Hey which side of the harness did you tie into? I assume you tied into the wires opposite of the plug going towards the driver side?
That would be correct! They are colour coded to make things a little bit easier.
On the other bypass kits theres the block off plates for the pumps, does the slyfox come with it too or does the bypass itself completely negate the need for them? thanks again glad you got your problem solved!
It certainly can come with block off plates! I did not need them as I’m currently not throwing any codes or having any issues. I used the relay to disable the system to avert myself of any future trouble.
@@looseaxles So does this mean the cut off plates are optional?
@@JP-uu2rw yes they are! I would only use them if you are having issues already.
Block off plates ensure that the Valve remain shut. If not installed you run the risk of them opening in the future and exposing the pressure sensor to exhaust. This can damage the pressure sensor and put the truck into limp mode.
Where can I get this for 50.00?
Email should be in a bunch of other comments!
Does it matter if it is already stuck? (closed or open)
If it’s stuck open you can get the block off plates. Since my pump was working as normal, I just installed the electronic bypass for now.
If I do this in California will I pass smog?
I’m not too sure. I think some other commenters may have an answer!
Anyone know how I can get this Slyfox bypass kit?? I need one asap!
jeffcolemaps@gmail.com
maybe i missed it do you have a link for the bypass part?
There is an email in a few comments that I posted!
I installed this and it works most the time but the pump still runs below -10F. Wondering if the resistance is too low.
Great question! I haven’t looked into this.
If bypass is installed correctly can I still somehow manage to get diagnostic reading of something wrong with lower a.c. pump?
You bet!
@@looseaxles That's not good. Mine worked great for two years now I have SVC and 4lo blinking but not in limp mode. Diagnostic reader code says problem with secondary air valve/pump. Mine has either failed or recent mechanical work done co.promised it?
@@johnthazelett8833any resolution to this for you?
@roughready7491 yeah I called Hewitt and they said I need to get the latest Gen 2 or 3 instead of earlier model I initially installed. So I had the latest installed and no problems so far- about 3 months ago
@@johnthazelett8833 awesome thanks man!
Is there anyway you can share a picture or the label on the ‘black relay’ that you sticked inside the fuse box. I’m trying to make my own but would like to see what this relay is. If there is a number on it or anything like that
Can’t see anything sorry! I would contact SlyFox directly - he will know for sure.
@@looseaxlesI ended up finding what relah, it’s an automotive 12v 30-40A 5pin. It uses a 4.7k resistor . I bought the sky fox and your video was very helpful for the instal !
@@NoXQchello sir how did you do it
Please 🙏 can you share the manual picture
Toyota air bypass (SLYFOX)will it work on 08 5.7 ?
You may have to reach out directly to him!
Where can I find this bypass kit?
jeffcolemaps@gmail.com
I have 09 sequoia with 4.7 i got the p2442 and it says secondary injection system switching valve stuck open bank2. But previous owner already had the bypass harness installed before i got it. Any idea what could be causing the code now? I assumed they either installed to avoid the problem or had the problem and used the harness to fix it but now it appears to be back? Any of your knowledge would be appreciated.
The bypass could have potentially failed, or failed previously? Typically people install block off plates when this happens.
@looseaxles so if the harness failed would the block off plates themselves correct the problem or would I still need to look Into the harness issue plus Install the plates? Thanks for any help.
They would work in combination with each-other - if you reach out to SlyFox, I am positive he will know what to tell ya! Tell him I sent you - he’s a super knowledge guy. His email should be in the comment next to yours!
@looseaxles Thanks a million man. Love ur channel.
Thanks so much for the kind words. That means a lot on a day like today.
Any update? How’s it running with the kit?
It’s been perfect!
Where can I guy this?
Purchase email should be in response to a bunch of comments$
Will this work for the 4.7 tundra
Sure will!
Will this kit help me pass emissions with a P1445 code?
Truth be told, I’m really not too sure. We don’t have emissions testing in Canada so my guess is as good (or worse) as yours!
Any performance hit if I do this instead of replacing the pump?
Nope! Just simply bypasses the system used to warm up your cats in the morning for emissions purposes.
@@looseaxlesis that legal?
@@Dontbustthecrustprobably not in Western States
Can i get the link?
SlyFox on the forums! His email is jeffcolemaps@gmail.com - tell him I sent ya
Do they still make these pre made ones?
Yessssir
@looseaxles I can't find it anywhere. I bought one on ebay last year and I can't them now.
SLYFOX on the forums makes them. I posted his email in a few of the comments on this video!@@bennymozzarella1605
any negatives in theory with not using the block plates if you install the bypass preventatively?
Theoretically, nope! Since you are bypassing the circuit to begin with, you wouldn’t require it. Some people install them anyways, or if they had previous issues.
So I guess you don't have a smog police where you live?
One of the perks of being up north! Luckily that hasn’t quite come our way yet *knock on wood*
The AIPs only operate during start for for about 30 seconds which are a poor design and allow moisture in the unit which will fail after time it’s just better to bypass the pumps altogether
Would it fit 05 sequoia ? I have replace both of the valve on the rear I still getting the code for bank 1 secondary air valve stuck closed
I believe so! I’d reach out to SLYFOX!
buy
Im in California, will this pass emissions?
I’m not too sure as I’m not in California.
I read somewhere that it wouldn’t pass smog in Cali
This is called LAZY! WHY NOT FIX IT RIGHT? It amazes me how many people won't fix it the right way but install this bypass because of a little yellow dash light that is driving them crazy. So later on the entire engine emission system and more is clogged with carbon and other contaminates and it becomes a nightmare money pit!
Bypassing a system preventively before it fails is not lazy, it’s being proactive.
Not the best video
Thanks I’ll be waiting for yours!
LOL
Do you have a website for Slyfox ?
I believe I responded to a previous comment with his email. He is on T4r.org
@@looseaxles thanks