Hyundai Tucson JM 2,0 / Gasoline / 2009 / 110,000 km For a few days I’ve heard a mechanical noise (similar to a ratcheting back bearing) as long as the engine hangs on the gas. If you walk away from the gas, the noise is gone. If you turn the engine up in a stand, there’s nothing to hear. Valve drive: Timing belts from crankshaft to outlet camshaft. A control chain connects inlet and outlet camshaft. Alternating interval of the timing belt is not yet reached. (Vehicle has dropped 110,000) or the automatic chain tensioner is slipping, I don’t think, because so far I have only heard control chains rattle when you went off the gas. However, these were all V6 engines that I had. Ideas? Can a turning or tensioning roller of the kerb belt cause such (load-dependent) noises? Or the Lima, servo pump or the climate compressor?