Thread: Hilux making a very odd noise

No difference clutch in or out. Mate came around and had a listen with ear muffs and a screw driver (mechanic thing I guess), said the cylinders, alternator etc sound fine. He said it sounds like something is loose and rattling, but no idea what, exhaust manifold or something. His other best guess was that it's dropped an injector. He said to him it sounds like an idling air compressor on a truck. Oh yeah we pulled off the oil filter, the oil isn't contaminated or anything. Off to the mechanic I guess.