[teagles]

Thanks, Mike. The bypass solution sounds very "interesting" to me. I was not previously aware of what a convoluted POS the SAIS is. That's why we had a mechanic replace the two pumps when they (apparently) went bad in the past (bank 1 was ~a year ago, bank 2 was ~2 months ago). This was a local guy, not a stealership, so he probably did not use OEM parts. I'm going to talk with him next week, to find out whether he ever checked the valves. I suspect he did not, since getting to them is such a PITA. Once I find out exactly what he did, and whether one of the (newish) pumps is actually bad, I'll decide how to proceed.

Out of curiosity, do most or all new vehicles (all makes and models) have some sort of SAIS? If so, I wonder whether other SAIS systems are so likely to fail, and whether they are as freaking inaccessible as these are. It's a damned shame my '86 Ford Stepside 2WD isn't big enough to pull our horse trailer ;-) But unfortunately I'm stuck needing some sort of 4x4 in the forseeable future.

Where is the SAIS air intake on the latest version of this truck? Is it less likely to get water into the system?

Thanks again for the helpful info!

 

[teagles]

We got a code reader from Amazon. Quickly found codes showing both valves stuck open, and Bank 1 pump stuck off. Everything worked fine up to ~120k miles, and we're now ~133k miles. I suppose it's possible that this is an electrical issue, e.g. chewed wires or failed sensors. No way for me to tell that since I would need to do some excavation to get to the wires. However, I'll meet with the mechanic tomorrow and discuss the whole situation with him. I suspect he won't be willing to install the block-off plates because he's a state licensed inspection mechanic and won't want to risk losing the license. IMHO the next best option would be for him to remove both pumps and both valves, and let me be present to examine them and come up with a definite plan, rather than having him proceed on his own without keeping me in the loop.

 

[teagles]

If you're going to have your mechanic pull the valves then you might as well have him replace it. The whole job is pulling out the old valve and putting in a new one. The difficult part is getting to them but to be honest, it wasn't that difficult when I replaced mine. You basically take the top engine cover off and you'll see it right there at the very back of the motor.

This is what they look like and good luck!

Air Injection Check Valve For 2008-2020 Toyota Sequoia Tundra Land Cruiser 5.7L | eBay

US NEW Secondary Air Injection Check Valve For Toyota Tundra Land Cruiser 25701-38060. For Toyota Sequoia V8 5.7L 2008-2020. For Toyota Tundra V8 5.7L 2010-2020. For Toyota Tundra V8 5.7L 2007-2009. 2007-2009 Toyota Tundra fit with Engine#: 3XXXXXX or 5XXXXXX.

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[teagles]

Thanks very much for all the suggestions and information!

To recap where things stand today:
Our mechanic isn't willing to do the bypass because of his state inspection license; he is going to replace the one failed pump (parts warranty); he will replace the valve assembly but he quoted us a price on OEM part.

I would be willing to use 3rd-party part, but would prefer it from a local brick-and-mortar store where it can be returned in case of a future warranty issue. Can anybody here comment on getting the valve assembly from NAPA, Auto Zone, etc., in terms of price, reliability, etc.?

Thanks again for all the very valuable help so far!!! Great community!!!