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[feeutfo]

Had a look but cant see anything obvious, its a bit tight at the back of the engine. Is it better to take the plenum off? I did notice that the four pipes going into the rear of the plenum had no clips on them.

it wont be obvious, in order to rub through it needs to be rubbing on something else, so by definition there will be something covering the hole if there is one.

As said, remove the main vac feed from plenum on pass side and check its not worn through by the ac pipe by bulk head. Get the engine running and feel your waylround the pipes litening for hissing. Role your sleaves up and get in there. Try reving the engine from the engine bay, check the multirams move, listen for the noise.

[Raymond]

Took off the main vac pipe, seems okay. Checked the pipes on all the T-pieces etc, all seem okay. How do I rev a DBW car from under the bonnet? The sound comes on constant when accelerating and if the car kicks down it is higher pitched, if I lift of the acc pedal then the sound goes then returns when I press the pedal again so it certainly sounds like a vac leak. Where would i be able to buy the pipes, I know I could get them from Vx but they are likely to be expensive.

[Raymond]

Does anyone know the size of the vacuum pipes on the Omega? I think I might replace all the ones that I can, one at a time to see if I can find this leak before I end up in the asylum. I just hate knowing there is a problem with the car and not being able to source it....aarrrggghhhh.

[Raymond]

A quick update and hopefully some advice. I have changed all the vacuum pipes I can get to, from both vac tanks and the connecting runs. There are two that I cant get to at the moment and I was hopeing someone knows what they are for. There is one at the back of the engine that goes straight down the back and my hand are too big to see where it terminates, and also the one that runs under the plenum. Does anybody know where these go?

[Omegafantasy]

When modifying my Y26SE to X25XE loom and intake I noticed that the vacuum hose came from the FPR. Not 100% sure if that's correct, but that's how mine was connected. It lines up quite nice with the FPR too.

[Raymond]

Cheers mate. Is that the one under the plenum or the one that goes down the back of the engine?

[Omegafantasy]

Mine came from the FPR, under the plenum and into a rubber hose joint under the throttle. Not sure what it was connected to after that as it was partially dismantled.
On later models it could also be from rear multi-ram valve to a tee with front valve and vacuum canister. At least mine was connected to the FPR.