Vacuum valve on bypass valve... - Toyota Nation Forum : Toyota Car and Truck Forums

andyb16 · 03-16-2008, 04:13 PM

What does it do? I noticed mine was broken while putting the turbo and stuff back on after changing the hfh. It apparently is a one-way valve, but one of the outlet tubes was broken off and the valve doesn't work anyway(air goes both ways). I don't know if it was broken completely off or not while it was on the car, but it couldn't have been working like it's supposed to anyway. I got one kind of like it from autozone to use until the dearlership gets my new one in, and the car is running fine, I just want to know what it does. Thanks!

Andy.

***ModifierMR*** · 03-16-2008, 07:12 PM

where is the valve located? On the bottom of the intake manifold? what color is it and where does the vacuum lines run?

Its either your AC Idle Up valve, TVIS VSV, or your Turbo VSV.

4DMR2t · 03-17-2008, 08:13 AM

I think he is talking about the check valve that connect to the lower chamber of the bpv. I know, because I also broke one of the nipples off mine one time.

You are correct in that it is a one-way valve. The stock bpv has 2 chambers. The vacuum line running from the intake manifold is "T"ed into 2 lines. One runs directly to the larger top chamber of the bpv, while the other runs through the check valve to the smaller lower chamber.

Under boost, the larger upper chamber produces more force and holds the bpv shut. When u let off the throttle, the upper chamber goes into vacuum, while the lower chamber holds pressure because of the check valve, resulting in the bpv snapping open.

Your simple autozone one-way valve should work just fine for now, but I don't know much about any long term problems/results from using an aftermarket valve.

***ModifierMR*** · 03-17-2008, 04:05 PM

I need a BPV, does anyone got one? lol

andyb16 · 03-19-2008, 06:25 PM

Thanks Frank, I just got the replacement one from the dealer today, so it's not an issue anymore.

What size and offset are your back wheels? That's the look I want for my next set. Thanks.

Andy.

4DMR2t · 03-20-2008, 09:41 AM

Quote:

Originally Posted by andyb16

Thanks Frank, I just got the replacement one from the dealer today, so it's not an issue anymore.

What size and offset are your back wheels? That's the look I want for my next set. Thanks.

Andy.

No problem Andy. The rears are 17x9 +35, with 245/40/17 Kumho ecsta MX tires. Had to roll the rear fenders to make em fit. They scraped a bit on bumps.