Why does my exhaust make a rattling sound?
If you hear rattling under the car it could mean that the exhaust system has become misaligned. If you can hear a loud metallic vibration, it usually means that something is touching the exhaust pipe or that a clamp, support bracket or mounting is loose. Hangers and brackets hold your exhaust in place.
Why is my BMW making a rattling noise?
When there is excess clearance between the crankshaft and connecting rod it can cause quite a noise. Overheating is a problem that will create a clicking or rattling noise in the engine compartment. This could be caused by many different factors such as low oil levels, low oil pressure, and cooling problems.
Why does my exhaust rattle when I accelerating?
A common cause for muffler noise is loose exhaust system components. Items close to your car’s exhaust pipe, such as exhaust connectors, exhaust rubber hanger, or loose exhaust bracket, could come into contact with the muffler by accident, causing that rattling noise in the muffler, especially when you accelerate.
What is BMW exhaust flap?
It’s a valve that stays closed when you start the engine to help the catalysts (?) warm up faster and produce less pollution. I believe it’s electrically controlled. I think it also stays closed much of the time when you drive, to reduce exhaust noise and ‘drone’. It opens on full throttle.
What is the most likely cause of a rattling sound coming from the underside of a vehicle?
Rattling from under your car– This can be caused by loose parts such as your exhaust system. Squealing wheels while braking– Causes range from small, such as dirt on the brake pads or rotors, to serious, such as worn pads. Brake noises are safety issues and require immediate attention.
Is it safe to drive with a rattling exhaust?
If the loud muffler is due to a hole, the vehicle is dangerous to drive and should be inspected by a mechanic right away. It is possible that a broken piece of the muffler may have come off and is rattling in the exhaust system, which can cause the clunking sound.
What does a failing catalytic converter sound like?
Rattling Noises. Your catalytic converter consists of small, honeycomb-shaped components that can cause a rattling sound when broken. If your catalytic converter is broken, this rattling should be loudest when the car starts, and should get worse over time.
When I press the gas I hear a rattling noise?
A very loose timing chain will rattle but what about bad fuel? That will cause a rattling noise too. If you think it could be bad fuel, try using high octane gasoline once and see if that helps. If so, tell your mechanic about it and ask him to check the EGR valve operation.
What does exhaust flap do?
In emission control, exhaust gas flaps are used to divert the exhaust gas flow. In this way, they trigger the HC (Hydrocarbon) absorbers or bring the starter catalyst to operating temperature more quickly. This is also done via an exhaust gas flap in the exhaust system.