Why does my 156 2.4 jtd Hiss like an angry cat!
I recently bought a 156 2.4 JTD, i wanted a V6 but the wife said NO! It wasn't going right at all when I bought it, no power above 2000 rpm and a loud hissing noise, I immediately thought boost leak, so replaced the boost pipes, and the Air Flow Sensor, Car now pulls like a train and corners beautifully, but the hiss is still there!
Anyone got any ideas, I am assuming that it is still leaking boost from somewhere, I am guessing turbo or Intercooler, where else can it be, the turbo looks OK but the cooler looks a bit ragged.
Any ideas would be welcomed before I go spending more money! I need to get it sorted as I want to go to Celtic Tuning in Newquay who have promised me 190bhp and 306lbft!!!!!!!!