Just to be sure we are talking about the same noise, you are saying the noise when you let off the accelerator quickly?
So you are raising the RPM and then quickly letting off the accelerator and the noise of the pop off valve?
That is a little loud but that is normal for it to make that noise when you wind it up and let it off. Basically you are building pressure in the intake and if they don't vent that when the throttle is closed quickly then the intake seals will be blown out.
If there are no performance issues and no codes then I would just keep an eye on it and if it gets worse then the valve may be leaking. However, you would most likely notice a lower boost pressure or the engine is down on power as the valve starts to hang open and you can't build boost.
Wednesday, November 4th, 2020 AT 3:48 PM