|
Have a listen in the engine compartment - does it come from the inlet manifold area?? If so, it's one of the motors winding down. Mine's started doing it, I guess it's just worn bearings.
Also, on the P11 (may be different for G20), there is some tinware shrouding between the manifold and exhaust. This has come loose on mine and resonates at certain rpm's - including when turning ignition off. Sounds like a bad tinny-rattle.
|