Hewitt Bypass Kit While Fixing Valley Plate Leak? (1 Viewer)

[lx200inAR]

If you install the wiring bypass on a functioning SAIS, isn’t there no need for block off plates?

If it’s functioning, no since the valves will be closed anyways. If you remove the valves, then yes.

 

[DrivenLyfe]

If you install the wiring bypass on a functioning SAIS, isn’t there no need for block off plates?

Possibly, I don’t know. Mine were not functioning and it was throwing the LX into limp mode.

Yeah, when I actually did the install my manifold was still on. It certainly is isnt impossible, but it’s difficult. In fact, I ended up removing the plastic cowl to get enough room to get my hands in to disconnect the clips.

I just did it too so not impossible but not fun and a pain. I had to use a long screw driver to do the passenger side.

 

[lx200inAR]

N

Possibly, I don’t know. Mine were not functioning and it was throwing the LX into limp mode.

I just did it too so not impossible but not fun and a pain. I had to use a long screw driver to do the passenger side.

Now that you mention it, I did the same on that side.

 

[kossykoss]

So you eliminated these pipes completely and plugged the openings at the exhaust manifold vs. using the block off plates Hewitt sells and the end of the tubes?

I read the bolts at the exhaust manifold can snap on rust belt trucks and then you are in world of hurt.

View attachment 3826262

Sorry for the late reply. Yeah 17362 and 17363Q have flanges at the end of the tube going to the exhaust. I chopped the tube off the end and had the hole in the flange plugged and then ground down flush. Super unnecessary but I just didn’t want those tubes just hanging out down there for no reason.

 

[jjtrou2072]

I am finally ordering parts for my valley plate leak fix.
Figured I would check back in and confirm that there are still no cheap quality alternatives to the Hewitt pressure sensors?

 

[lx200inAR]

I am finally ordering parts for my valley plate leak fix.
Figured I would check back in and confirm that there are still no cheap quality alternatives to the Hewitt pressure sensors?

None that I'm aware of. There is more complexity than just the sensor though if you go that route. Because the connectors still have to go back to the OEM harness behind the manifold. Or at least I assume they do. Those are details that would have to be worked out, plus the basic connectors that come with the SAIS kit are designed to interface with the 5 pin connectors on the SAIS pumps, so you would need the different connectors from Hewitt to use the 3 pin MAP sensors. Granted, as long as you are willing to hack up the connectors, probably everything you need is in the kit. Except some connectors to connect to the 3 pin MAP which they sell reasonably cheap ($25/pig tail).

Something tells me, pretty much any 3 pin Toyota MAP sensor would work.

 

[CharlieS]

Not sure this is relevant, but I had the sais fail on a previous 200. Hewitt will tell you that their fix works on some sais issues, but not all. I used the Hewitt bypass kit with success. It is a pain in the ear to install and uninstall due to the limited access at the back of the engine. It worked as expected though. My failure was the computer that controlled the system- I found a used one on ebay (from a Tundra, if I recall correctly) and that was the real fix. The upside of installing the Hewitt kit while doing the valley plate fix is ease of access to the hard to reach bits. But if your system is working now, I wouldn't mess with it. I saved mine in case I ever need it with my current 200, it is a good workaround.