Why does my car make a rattling noise when I start the car?
Why does my car make a rattling noise when I start the car? ” If your car engine is making a rattling noise on startup, idle or when accelerating you could have a faulty serpentine belt tensioner, a loose bolt on the mounting bracket, loose timing belt, rusty or broken flexplate, faulty harmonic balancer, loose fan blade, engine knock (pinging) or low levels of engine oil. Why does my catalytic converter rattle when I turn it on? When you hear your catalytic converter rattling, it may be on its last leg. But what is causing it to rattle? Catalytic converter...