Q: Upon starting, loud noise from catalytic converter

asked by on

From how my car is sounding, I am thinking that the problem is probably the catalytic converter. After starting my car first thing, there is a terribly loud noise that sounds like marbles being shaken in a metal jar. Once the car is moving, the sound goes away. The day after this started happening, the exact same symptoms occurred. Finances are tight right now, so I'm wondering how long I can go before having to have this fixed. I would certainly appreciate your diagnosis. Before going to a repair garage, how long can I drive my car safely before I should take it to a mechanic?

If the catalyst is broken inside the converter housing of your 2001 Mercedes E430, then you may get some loss of power due to increased back pressure from partial blockage created in the converter. This can also lead to increased engine temperatures and possible overheating. The engine temperature will need to be monitored while driving, and this issue should be looked as soon as possible to prevent damage to the engine and to ensure that emissions stay within standards. You may want to enlist the help of a mechanic, such as one from YourMechanic, who can inspect the noise and determine the best next action.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Upon starting, loud noise from catalytic converter

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My van tramission fluid all leak out the car, and the car isn't shifting gears is acting on neutral ....

Hi there. It seems that your transmission has a large leak. The first thing to do is to move the vehicle to a safe area where an inspection can be performed. Locating what has ruptured, cracked, split, ect... may be...

Q: Broke down on the highway and had towed to a Buick dealer. They diagnosed and replaced the catalytic converter.

It is possible that the new catalytic converter is bad. Sometimes, when the converter comes apart inside, it can get into the muffler and cause it to be clogged.

Q: Engine puffs blue smoke; thumping noise at highway speeds

Hi there, thanks for asking about your 2004 Infiniti FX45. The blue smoke you notice on initial start-up is likely caused by worn exhaust valve stem seals. They allow a tiny amount of oil to get into the combustion chamber...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.