hissing all the way though the revs

[jason-jm]

It sounds like theres a big build up of air under my bonnet, even witha standard DV is this normal?

 

[acidstrato]

possible

or could be that the dv is fudged
or that there is a boost leak

if no performance loss, then don't worry too much

 

[jason-jm]

Im getting major flat spots.. Ive had a standard DV and a recirc dv.. both do the same

 

[H8T WP]

have you lifted bonnet and revved it? check for boost leaks ! do you have a boost gauge ? whats your vacuum on idle

 

[jason-jm]

il have a look for boost leaks tomorrow when its light...

I dont have no gauge to tell me

you think if its a split pipe or pipe come loose this would cause flat spots?

Its odd how its worse sometimes though

 

[acidstrato]

if theres a split vac hose then it may feel like its performing as normal and then all of a sudden hits a wall and there no more power or it could just not boost at all

usually its not difficult to spot a leak as they are fairly audible even on idle so an ear of the engine is all thats needed, but sometimes they can be a pain in the arse and may require you to spot check every vac hose

logging with vagcom can also identify a leak

 

[jason-jm]

if theres a split vac hose then it may feel like its performing as normal and then all of a sudden hits a wall and there no more power or it could just not boost at all

usually its not difficult to spot a leak as they are fairly audible even on idle so an ear of the engine is all thats needed, but sometimes they can be a pain in the arse and may require you to spot check every vac hose

logging with vagcom can also identify a leak

I couldnt hear any under the bonnet, Its only when Im driving it

 

[silverback]

I get quite loud hiss from 150 tdi Toledo after hard on the accelerator and off again. Quite audible inside the car and with the window down. Have had no loss of power and checked the hoses around the intercoler. Everything looks grand. Must just be the type of her.