Kjet - Hissing noise from Aux Air Valve

[MikeH]

I've been struggling to resolve a problem with my daily - it's a J plate Scala on *just* 185k miles. There's a hissing noise like an air leak, but I've had the inlet manifold off recently, with a new gasket, and there were no obvious signs of cracks or other damage.

I had a listen the other day down a cardboard tube, to try and narrow down where the noise was coming from, and I think it's the aux air valve. I tried another one, but that didn't seem to make any difference.

I'm assuming it's an air leak into the engine, but is it possible to have a hissing noise from the joint in the toilet bowl manifold? Sounds more like an inlet vacuum hiss to me though, rather than pulsing like an exhaust leak.

[monzajake]

mike has it got the air valve thing on the back of the head ? its inline with injector 3 & 4. The plastic casing could be damaged.

[MikeH]

Hi Jake - it's a digifant head, so it hasn't got that bit, and the end of the pipe is not open (piped to a 16v WUR).

The holy cardboard tube of wisdom says it's the AAV. I might see if I can bridge the hose connections and see if it stops it.

Does yours run on Kjet? Has it still got the AAV, or does it have the 16v ISV setup?