My 2002 petrol auto Hilux ute (an RZN 149R model) has developed an unusual clacking sound which my Toyota dealer and a local mechanic are unable to explain. The ute has done 200,000 km of light work, has been regularly serviced and is in overall good nick. The noise has just started as we have moved into the cooler weather. After nights where the temperature has dropped below 10 degrees, when starting the engine and then shifting the transmission into drive, there is a clacking sound which goes for about 5 to 10 seconds, before disappearing. The sound only starts after drive is engaged, and it goes for the 5 - 10 seconds whether the ute is stationary or moving. It sounds a bit like a belt whacking on something metallic but all the belts are tight and OK. The engine and transmission oil levels are both fine. The ute has been up on a hoist and checked thoroughly twice, but there is nothing loose or out of the ordinary to see in the engine bay or underneath. The problem is that I leave the ute with mechanics overnight but the noise runs for such a short time that its so far been impossible for any of them to diagnose the issue. I've downloaded a phone recording of the noise which I hope comes through OK (its 37 mgb, so please give it time to load). Any help or suggestions will be very much appreciated.
Thanks, Poitr
IMG_3299.MOV