Hi I've got a b5.5 1.9 tdi 130bhp passat wagon, it's loosing the pressure when I put my foot down, this is is in every gear.. At one point I lost all turbo boost. There is a hissing noise when the turbo kicks in.. On tick over there is no hissing noise, I'm guessing this is because the turbo is not in use. Also when it's sitting bout 2000 revs it seems to chug a little, like there's power then now power and then all of a sudden there's power again. After 2300 revs this stops and it carrys on like normal just with the hissing again..
I recently had the cat changed on it as it snapped, it is a second had one on it now and the flexy is going on that but the cat is in good condition, I can't find no air leak on it...
Can anyone help? or had this problem before?
Cheers bill!
Turbo hissing
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