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[tidla]

theres a sketch of the pipes done by mark in the link above.

[Webby the Bear]

i've seen the sketch but just wanted to make sure what i'm seeing on the car is the same as whats on that 

[TheBoy]

Webby - on your car, the vac tank pictured does both the front and rear multiram.

Said vac tank has a 1 way valve on it's inlet, essentially to allow the manifold to pull a vac in it, and then the vac tank can maintain a vac for a few multiram operations no matter what the manifold is doing (and obviously the manifold will keep maintaining the vac whenever possible.

So, you have either:
A leak in the pipes/rubbers/t-pieces from vac tank to multirams
A leak in the multiram solenoids
A failed one way valve in the vac tank's inlet     <<<<  LIKELY!
Vac tank incorrectly connected      <<<< LIKELY if someone has been pissing around
A leaking vac tank

[Webby the Bear]

Webby - on your car, the vac tank pictured does both the front and rear multiram.

Said vac tank has a 1 way valve on it's inlet, essentially to allow the manifold to pull a vac in it, and then the vac tank can maintain a vac for a few multiram operations no matter what the manifold is doing (and obviously the manifold will keep maintaining the vac whenever possible.

So, you have either:
A leak in the pipes/rubbers/t-pieces from vac tank to multirams
A leak in the multiram solenoids
A failed one way valve in the vac tank's inlet     <<<<  LIKELY!
Vac tank incorrectly connected      <<<< LIKELY if someone has been pissing around
A leaking vac tank

TB, thanks very much for the post.

Pic again for clarity...

I ran engine for few mins. Pulled top pipe off the tank arrowed. Nothing. Ran engine again. Pulled bottom pipe off. Nothing. New vac tank? (It looks replaceable with two clips.... I presume that's correct and I don't have to buy the whole bagpipe assembly  )

Thanks mate 

[TheBoy]

Just fit a one way valve to the pipe feeding the tank

Or I see RobG has one

2 torx bolts.


Have you ruled out other areas of leakage?

[Webby the Bear]

Just fit a one way valve to the pipe feeding the tank

Or I see RobG has one

2 torx bolts.


Have you ruled out other areas of leakage?

Thanks mate.

I've looked at all the pipes and I cant find any ''randoms'' just hanging loose.

I have been looking at Mark's diagram and I think I have it done correctly but I'm going to quadruple check. 

In a few i'll post up where the various pipes from this vac box go just to double check.

Is it worth pursuing the vac box behind the pollen filter? I listened to it as ma switched car off and hiss is not coming from the pollen filter area. but I know not if this a definite diagnosis (although I hope so as that one behind the pollen filter looks a reet pita!)

 

[Webby the Bear]

Gooood morning fellas,

Think we have a diagnosis 

Went out this morning and quadruple checked the routing against Mark's expert guide.

It's all spot on!

Undid the vac tank to inspect it. No obvious gouges or holes.

SO. This sounds like a new front vac reservoir needed?

[Webby the Bear]

Pps, is the one way valve the small one on the vac reservoir? and presumably shouldn't let any air out when car switch off?

just checked on car and it lets all air out within a second or two (sounds like the hiss).

[Webby the Bear]

Ok, thanks to rob g for sorting me out a new vac res.

I've gone out and checked the vac lines AGAIN lol definitely spot on and as per guide.

I've also checked all lines and t pieces and nothing is broken.

Now I've mulled this over and as the lines are hooked up correctly it has to be a bad reservoir. . . No hiss when I pull the smaller outlet line cos the bigger lines one way valve is allowing vacuum to escape.

[Webby the Bear]

Not bumping guys, but thought I'd update with a resolution

RobG kindly sent me a replacement vac box. . . . . . I now have a hiss after I pull one of the multiram lines (the smaller one).

So, clearly the oneway valve was bad. Going to smash the old one open to inspect

Will be testing its power later

[Webby the Bear]

....different car!!!!!!!!! 

Now got some god damn power between 2k and 4k RPM!!!!!!!

Cheers for all ya help guys 

[RobG]

Easy & cheap fix then Steve

[Webby the Bear]

Easy & cheap fix then Steve

Spot on Rob 

Thanks for quick n slick service as usual 

[RobG]

Glad to have been of help mate

[Webby the Bear]

Glad to have been of help mate

Cheers mate 

Smashed the old one open....



There was a little bit of damage on that rubber gasket (?)........ I avoided smashing that with the hammer.

Not really sure how they fail cos its not like there's much stress there. having said that vacuum from engine is strong (ask my mate who put his fingers in a closed throttle body  )