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?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  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 car shuts down when I'm driving down road, like it ran out of gas. It also overheats and blows cold air when the heat it on.

The very first step you need to take is getting a scan run on the computer. Take your car to a technician or a local parts store and have them scan the car. They will give you a list of...

Q: Catalytic converter going bad. Can I prolong its life?

Unfortunately, there is not much that can be done to prolong the life of the catalytic converter as they are very expensive to manufacture, thus the high cost of replacement. In order for the converter to work effectively, there are...

Q: Rack and pinion

Was the power steering system flushed at the time of the service? Dirty fluid or a misalignment can cause the power steering pump to groan when turning the wheel. Return to the facility that performed the repair and have them...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...