Why is my truck engine rattling?
Why is my truck engine rattling? Most people call this a pinging or rattling sound. This noise is caused by an air/fuel mixture in the engine cylinder being ignited prematurely by the heat of compression as the piston is moving up on the compression stroke. And that's also why you hear the pinging and rattling noises. Why does my car rattle when I start the engine? If the belt is loose or has little pressure holding the belt then the tensioner has failed and needed replacement. You can also start the engine and observe the tensioner in action. If there...