funkadelic

It has done just over 100 000k's so could it be timing belt.

anyone know what it could be???

Unlikely as the ZZ series engines don't have a timing belts.

so any other ideas where it could be coming from

Hey,

Just wondering if there is a whistling sound coming when I engine brake in first or second gear what it could be. It has done just over 100 000k's so could it be timing belt. I think it was doing it in a first gear for a while, but just recently it started doing it in second.

When im downshifting at about 3000 revs, nothing then as it slows down it picks up. when i accelerate it all sounds normal.

anyone know what it could be???