I have a strange engine noise, sounds like a knocking that speeds up with engine rpm and almost goes away at idle. I checked with a stethoscope and it appears the noise is not coming from the heads or lower block, timing chain area or waterpump. It gets very loud at the tensioner but the noise almost sounds like a rod bearing. The engine was rebuilt 6 months ago with new bearings, heads reworked, timing gears, chains and tensioners replaced. The only old items are the water pump, AC condensor, power steering pump, belt tensioner and idler bearing.Can a belt tensioner pulley make this knocking or clicking noise.