Clicking blow off valve on a 1jzgte

**stidnam** · 21-03-2009, 08:15 PM

Hi all,

I've just finished most of my conversion into my ra28 and ever since I got the motor running the blowoff valve has made this constant clicking sound.

Tonight I was mucking around and pinched the vacuum hose running to it and it subsequently stopped its clicking.

What would be causing this? Could a crack in the vacuum hose do it?

Also theres a little filter that splits off the vacuum hose just before the bov. Can someone explain what this does. Is it as simple as it looks. Just a little filter?

Thanks

stidnam

**Aust162** · 22-03-2009, 02:51 PM

i think that little filter is actually a one way valve. the black side (marked with B) should be facing towards the front of the car, sort of downwards.

**Z2TT** · 22-03-2009, 04:18 PM

Hi,

Maybe a particle or a piece of metal or plastic fell into the valve, causing it to make a clicking sound every time it vents, but you said it's a constant noise, so the valve is always making this noise?

Take the BOV out and take it apart to inspect it. You might need some needle nose pliers too.

**wilbo666** · 22-03-2009, 04:48 PM

Originally Posted by stidnam

Also theres a little filter that splits off the vacuum hose just before the bov. Can someone explain what this does. Is it as simple as it looks. Just a little filter?

Thanks

stidnam

It isn't a true 1 way valve... it is actually a restrictor...

It has more of a restriction in one direction as opposed to the other (It does allow flow in both directions).

My memory indicates to me (It's been a long time since I looked at how it worked), that it is used to 'damp' the closing/opening of the BOV

Cheers
Wilbo