Think I can hear an air or vacuum leak...

[muddyboots]

On the Passat, I can faintly hear what sounds like a air or vacuum leak. (It might be some sort of rattle, not completely sure).

It's very consistent though.

If I'm cruising with no or hardly any throttle, I can't hear anything untoward.

But the slightest throttle application results in a quiet leak/hiss sound, when I lift off it stops. Actually there's probably a second or so delay each way - IE starts slightly after I press the throttle, stops slightly after I lift off.

Any ideas what this might be ? I was thinking the delay could be a clue, perhaps a leak in the VNT or EGR actuators.
Engine is boosting OK as per my other post, maintaining around 1.34/1.35 bar.

Guess I have to learn about N75s and things now, rather than the all-in-one box that the Ibiza had

 

[sssstew]

thats stange that its boosting ok if its loosing vacuum. So you have a seperate N75 and N18 on your 130, like the old 110s then lee?

 

[basstard]

sure it ain't just the turbo hissing???

 

[muddyboots]

I don't think it's the turbo, have to say I'm not 100% sure though...

I think I have separate N75 and N18s...

The good thing is, Haynes have just released a manual for this car and I've ordered a copy, what a novelty !

 

[sssstew]

pop the bonnet and have a quick look lee

 

[muddyboots]

Unlike the Ibiza I actually need tools to get the engine cover off...and it's cold, dark and wet outside...and I should be focussing my efforts on prepping the Ibiza for sale.

Fancy a Mk4 PD130 Stew ?

 

[sssstew]

too right i would love one! but funds dont allow im afraid

You shouldnt need to take the engine cover off to see the valve i'd imagine they would be bolted to the bulkhead.