Q: My car wont go above 40 mph,has a burning smell,and has a noise?

asked by on

My car wont go above 40 mph and when i try to go faster it does a weird noise and smells like burning.

My car has 250000 miles.
My car's transmission is unknown to me.

Hi There, What you are describing sounds like you may have a clogged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When the catalytic converter is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly. When this happens, the engine is forced to work much harder to expel these gases. This often results in the engine bogging down, hesitating, shaking and causing very poor fuel economy. This should also cause a check engine light to come on as the O2 sensors should be reading the incorrect amounts of oxygen in the exhaust gases if this is your problem. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your catalytic converter.

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. My car wont go above 40 mph,has a burning smell,and has a noise?

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: Truck will rank but no start. Back fires through intake

With the information that you have provided, it sounds to me like the distributor may have been installed 180 degrees out of rotation. If the engine is turning over so easy that it sounds like there are no plugs in...

Q: I' trying to start my vehicle and it made a loud clacking noise and the battery is drained

Hello. If the vehicle produced a clicking clacking sound when the key was turned then it may be possible that the battery or starter are the issue. A faulty, or low battery will cause the starter to click if it...

Q: I just did a radiator flush on my car and now I'm loosing all my coolant out of my reservoir and my radiator what could be the iss

Normally, the cooling system pressure should be around 16 psi so if you have a reading of 13 psi, that would be considered low. If you are positive that you have a leak, I would recommend locating the leak and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.