Wonder if anyone can help me with this?
A month or so ago i noticed that with my foot planted to the floor the car boosts correctly to around 15psi and holds about 14psi.
It is fine up until 5000rpm+ but a rattle appears from under the bonnet. Im presuming its from the engine. Can only hear it with the window down.
I have thought it might have been pinking and have changed petrol to optimax to be sure, as its running a phase II chip. It still appears
The engine is sweet as a nut and even putting my my foot down in third pulling from low revs, there is no noise until it reaches 5000rpm.
Any advice would be greatly appreciated, as im confused.