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Hewitt-Tech Inc. Plug & Play Secondary Air Injection System Bypass Kit

Discussion in '2nd Gen Tundras (2007-2013)' started by djmichael24951, Jul 11, 2019 at 5:00 AM.

  1. Jul 11, 2019 at 5:00 AM
    #1
    djmichael24951

    djmichael24951 [OP] New Member

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    Any reviews on the Hewitt-Tech Inc. Plug & Play Secondary Air Injection System Bypass Kit? Is it just a quick temporary fix? There is a lifetime warranty on it. I have the dreaded secondary air injection system problem on my 2008 Tundra 4.7L. I am having trouble deciding whether to replace the parts or put the bypass kit on it. I've always been one for fixing things the right way, but I am a disabled veteran on a fixed income, and this problem is quite pricey. Especially, since we are going on vacation next week. I really do need my truck for that trip. Also, please correct me if I'm wrong, but on my truck, it looks like there are 2 pumps. The pump for the Bank 2 check valve is in the fender well, and, it looks like the pump for the Bank 1 check valve is under the intake. At first I thought this job was gonna be a little simpler, compared to other models and engines, since the check valves are mounted outside the engine. But then I traced the tube coming out the back of the Bank 1 check valve, and it goes around back and under the intake manifold. I just assume there is a pump under there for that valve. I can't seem to find a different part number listed for my model and engine, for that second pump. The Bypass kit for my truck is $395. The cost of the parts to fix it the right way is gonna be about $200 more than that.
     
  2. Jul 11, 2019 at 5:29 AM
    #2
    parker44

    parker44 New Member

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    There are a few threads regarding this issue on here, but I have the exact same truck specs as you and I installed the Hewitt Kit last October. It essentially bypasses your AIP system so while it's not technically "fixing" the problem, it's keeping that system from turning on so it kind of is fixing it at the same time, if that makes sense. That system is basically only used at cold start up, and is for emissions only. It makes the exhaust burn cleaner, quicker. I had my system replaced once in 2015 under warranty, and then it went out again October 2018. It's a faulty design by Toyota and there is no way of knowing how long it will last if you replace the parts. Some people never have an issue with it, and others such as myself have had it fail twice with no unusual driving.

    I'm not sure where you were looking at parts to replace it at and if you are able to do some of it yourself, but this job at a dealership is $2k-$3k easily. I just couldn't spend that type of money knowing that it could fail again. I would get the Hewitt Kit and call it a day. The kit is super easy to install, and literally is just plug and play.
     
  3. Jul 11, 2019 at 5:47 AM
    #3
    djmichael24951

    djmichael24951 [OP] New Member

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    I am a auto mechanic by trade. So, I am very capable of doing the work. I just haven't done a whole lot of it since I got my disability from the VA. A brake job here and there is about the most I get into anymore. But, I'm sure I can perform the required repair for this particular situation. I was just thrown for a loop, when I found only one pump in my fender well. But with vacation next week. I am leaning more (much more) toward the Plug & Play. For nearly $400, I just wanted to make sure that it would be a permanent fix. Compared to your previous winters, is there any performance difference at cold start up?
     
  4. Jul 11, 2019 at 5:58 AM
    #4
    djmichael24951

    djmichael24951 [OP] New Member

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    And I did research several different threads on this topic, and watched several Youtube videos, but never could find any information on the second pump being under my intake manifold. Without removing the manifold, I can only assume that the second pump is there. I did see a video on a 2006 model 4.7L, and it had a pump and a check valve under the IM. But it seems like there is know information for the 2007 and newer 4.7L models. Correction, there is one video of a man changing his Bank 1 check valve, which he had stated that he had done several times. But, I've seen nothing on performing the entire job for my particular application.
     
  5. Jul 11, 2019 at 6:23 AM
    #5
    parker44

    parker44 New Member

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    No I didn't have any differences on start up. When I said cold start up, I also just meant starting in general after sitting a while. I'm in SC, so it doesn't get toooo cold here haha. I had a mechanic also look at replacing mine and he said the pumps he was finding were all about $500 each, so that sounds about right. I would just get the kit and call it a day. They are very knowledgeable about their products and have good service as well. For me, I wouldn't have been able to change them out myself so it was a pretty easy decision on my side. It's just a pain that even by spending the money to replace those pumps, they could go out again in a year.
     
  6. Jul 11, 2019 at 7:00 AM
    #6
    Trident

    Trident New Member

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    I installed the Hewitt bypass on my 2007 5.7 a few months ago and have had zero issues since (nearly 4,000 miles). Install was fairly easy & gained nearly 2mpgs to boot. I am seeing only positives.
     
  7. Jul 11, 2019 at 7:31 PM
    #7
    EBenke

    EBenke New Member

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    3/2 lift, Icons, 35's, 3" CB's shackles
    DJ - Thanks for your service.
     
  8. Jul 11, 2019 at 8:19 PM
    #8
    djmichael24951

    djmichael24951 [OP] New Member

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    Thank you for your support.
     
    EBenke likes this.

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