Thread: hissing sound

sounds like 1 of the intercooler hoses leaking,
check for splits

Originally Posted by roverv8

sounds like 1 of the intercooler hoses leaking,
check for splits

++1

thanks guys, ill check again, would this make the turbo less effective thereby loosing some power

cheers

ken

I've heard that noise in that rpm range, and then I've popped the bonnet and listened, and the noise seems to continue above the 1200rpm range, it's just hidden by other noises with the bonnet down.
I still don't know what it is, but I've replaced the intercooler hoses recently, so it might be something else.

The other thing to look for, is a warped exhaust manifold.

Although, it is usually reported as a whistle, it could hiss, I guess.

On mine, the stud at the back, closest to the turbo, broke.

Its a known problem, and an easy fix.

Just check & see if any of the nuts on the exhaust manifold are loose or missing.

I've done the manifold just recently too so I hope its not that.

Originally Posted by Pinelli

I've replaced the intercooler hoses recently,

On the intercooler, drivers side which has the black plastic tank.
where the intercooler hose connects, don't push the hose on to far, if you have a look with the hose off, you will see 2 ridges either side of the outlet, probably to strengthen the plastic outlet.
you only need to push the hose on till its flush with those ridges and clamp tight.
If you push the hose till it's flush with the intercooler it goes over those ridges and will not seal.
Best to look with a torch, not much room in there.
Well worth a look!