HansJS

I found this video.
It seems to indicate that the box I highlighted isn't a valve at all but just a thing routing vaccuum. Or something. I don't really understand but it deepens the mystery.

westdude

Seems to be a combined vias solenoid and vacuum dashpot thingy

westdude

I think that thing may be a bracket with two separate solenoid valve in it...

HansJS

Yeah, that's what it's looking like. Basically, it's a piece of plastic, call it bracket or housing, that's box-like in the front and bellows-like in the back and contains the VIAS control solenoid and the swirl control solenoid. The swirl actuator is elsewhere in the engine but the "actuator power valve" (not the "power valve actuator" lol) is behind the VIAS control solenoid. It is part # 14510-8J110 (edit) I believe.

The thing is, this is the only thing that could "rusting" and which actually interacts with the engine power supply. Even if the VIAS control solenoid were failed, the worst it could do is not move the actuator power valve.

So, I am getting somewhere, I think.

EDIT, EDIT: So, looking at both the picture of the part (14510-8J110) and a picture of the intake manifold plenum, it actually seems to be the case the "VIAS control solenoid" and the "actuator power valve" are actually a unit and sold as such. That fricken part, with no mention of VIAS, is essentially you need for a worn-out VIAS system.

westdude

a power valve assembly for a 2001 Infiniti vq30de is very hard to find a part number for, let alone an image

HansJS

Here's a blog on "fixing VIAS". I can't really understand what they're talking about cut but it does seem they're working on the VIAS of a 5th gen Maxima. Any ideas?

https://www.my4dsc.com/how-to-fix-vias/

westdude

if only someone could have snapped an image of the part numbers... below one is on eb ay
I really suspect that part is no longer available new.



different offering on eb ay



It may not be considered a different part from the intake upper...

14013M - COLLECTOR-INTAKE MANIFOLD
14010-2Y910 Applies: FED.VQ30DE

04.1999 - 07.1999 01 Out of stock
14010-2Y915 Applies: FED.VQ30DE

07.1999 - 06.2000 01 Out of stock
14010-3Y105 Applies: VQ30DE

06.2000 - 07.2000 01 Out of stock
14010-3Y110 Applies: VQ30DE

07.2000 - 06.2001 01 Out of stock

HansJS

Just an update on this gnawing problem.

The shop once against said my suggested wasn't and suggested buying a whole intake. On the new intake pictures I see, the VIAS parts seem to be missing.

Posts on this board from 10-20 years ago seem to be the best guide to VIAS questions on the web and they describe fixing the "Vias problem" by, apparently, as far as I can understand, bondo-ing the flap shut (unfortunately, all the pictures are gone from these old post, it seems). That seems like the simple solution since it would require no new parts. I'd hesitate to do that myself, I don't know if my shop would do such a "kludge" but I may find a friend who can do it. The only potential downside of this would be losing power at the "high end" (past 5K rpm) and I don't normally use that power.

westdude

I think the jb-weld repairs were for reattaching the butterfly valve to the vacuum lever shaft, not glueing it all shut.

maybe get an upper intake manifold from a scrap yard and see how the part works, and maybe even fix that part?