just been out and replaced my oil cooler thermostat, done the job, started her up and let her idle for a bit, took for a 5 mile run and all good, so let it tick over in the drive for a bit to see if the temp fell back down (it didnt phewww) but when I give her a good blast of the accelerator I noticed a noise, like a metallic whoosh almost like a dump valve about 2-3 secs after I let off the throttle pedal.
Checked all the hoses and made sure all the clamps are fine, theres no play in the turbo shaft except the bare minimum thats been there in the 5 years I've had the car and its never got any worse.
apart from checking all the metal pipes for pin holes anyone got any ideas what it could be?
edit: the thing has been overcooling for a while and the idle speed has been raised during this time, obviously the ecu thinking its still a cold engine so upping the idle with more fuel to compensate (ive used a load more fuel lately) could it be the actuator arm or the vanes sooted up due to this overspooling? she doesnt seem to have lost any power that i notice and still reaching around 22 psi normally with around 26-28 psi overboost that i can see on the boost gauge.
Edited by DavieWeegie, 22 January 2021 - 04:22 PM.