What is this pipe for?

[caister]

As title what is the pipe circled in red for and where does it go as there doesn't seem to be one in my PH1 the outlet on the manifold is there but its got a cover on it.

 

[Reyes]

Cut it and see

 

[caister]

Read again!! There is no pipe on my car just wondering if there should be!!

 

[Reyes]

Thats what i meant

 

[caister]

Well now you've confused me!!

 

[Russ_16v]

dont worry mate my ph1 has the same, no pipe just a cap blocking the hole

 

[-KarL-]

just went out and took a picture of mine;

 

[BenR]

Acoustic valve.

 

[Russ_16v]

Acoustic valve.

Cheers ben, i was wondering what it was for actually lol

 

[Andyman]

Other end connects to the injector rail right??

Mines a late spec ph1 and for some reason never had one on either :S

Thought this was just a fuel breather pipe or is that what a accustic valve actually is ?? :S

 

[davebem]

I didnt think ph1s had acoustic valves. Mines got that pipe going into the fuel rail, as above i thought it was some sort of breather. Ive never seen another ph1 172 with the pipe fitted though..

 

[DrR]

As said it goes down to the acoutstic valve.

 

[Jay Payne]

Fuel pressure regulator on a phase 1

and

acoustic valve on a phase 2

 

[Jay Payne]

caister is your phase 1 a Y plate? twin lambda sensor one?

wondering if its only on the early phase 1's coz Russ has a Y plate and Andyman says his was a late spec.

my W plate has it

 

[partyboy23]

acoustics valve

 

[willparker255]

mine has that pipe and is a 2000 x

 

[Jay Payne]

i reckon its only on the early phase 1's then (pre 2001 eobd)


and the phase 2's for the acoustic valves

 

[-KarL-]

yeah mines Y reg

 

[caister]

Mines a Y reg too. As long as others have it blocked off. I assume there would be no benefits to connecting it??

 

[Andyman]

Mines a Y reg aswell.

Its 100% not a acoustic valve. Ph1's never had acoustic valves fitted and the other end of the pipe should be on the end of the fuel rail if i remember rightly.

Pretty sure its just a breather hence its little importance when they decided to leave it off the later ones of the same model

 

[Russ_16v]

mines on a Y and was reg'd in March 2001

 

[Tom84]

Mines a Y reg aswell.

Pretty sure its just a breather hence its little importance when they decided to leave it off the later ones of the same model

its not a breather as its after the throttle body so is a vacuum pipe and must be sealed to prevent poor running

 

[sammyhale22]

It connects to the fast idle valve responsible for your automatic 1500rpm at cold to warm the engine up. At least on the ph2 i found it connected to a fast idle valve, its bolted on the side of the acoustic valve and has a 2 pin connector going to it.

Samuel

 

[sammyhale22]

It connects to the fast idle valve responsible for your automatic 1500rpm at cold to warm the engine up. At least on the ph2 i found it connected to a fast idle valve, its bolted on the side of the acoustic valve and has a 2 pin connector going to it.

Samuel

 

[sideways danny]

It connects to the fast idle valve responsible for your automatic 1500rpm at cold to warm the engine up. At least on the ph2 i found it connected to a fast idle valve, its bolted on the side of the acoustic valve and has a 2 pin connector going to it.

Samuel

lol, just no.

the accoustic valve doesn't have anything to do with fast idle, that's actuated by the throttle body (on the ph2). Accoustic valve is just a noise limiting device