V70R Overboosting/Knocking/Lack of power

[NewKidOnTheBlock]

The car drives much better now, but after driving a little more, boosting fairly hard I still notice a rattling sound from the engine which I've always suspected was "pinking" or pre-detonation sound, it sounds almost like someones ringing a small bell in the engine bay but you can just hear it over the engine sound, this happens earlier in the rev range and not just at peak boost when the power drops off worst. I do wonder if it's running lean through the range, maybe a bad map or maybe a full pressure or injector issue?

I've ordered myself a new waste gate actuator as it was pretty cheap and I thought that rules out another whole component but I'm going to have a look and see if I can get my injectors tested and cleaned if necessary, would rule out another thing. I've not looked into the TCV yet as I have been working on other projects today but I will try and get around to it over the weekend.

[scot850]

The rasttling could also just be a broken or loose heat shield. Check the one on the exhaust manifold on the back of the engine where the bolt holes sometimes eat through, and then the one below the car above the cat which does the same.

Neil.