Skip the auto shop - Our mechanics make house calls

Q: Car struggles to accelerate

asked by on

The car ran fine until recently it struggles to even get to 40mph. The car is noticeably lounder and sounds under streas when accelerating. I changed the spark splugs and the coil pack and it did nothing for my problem.
My car has an automatic transmission.

A: This may be a sign of a clogged catalytic c...

This may be a sign of a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly (think of a backed up sink). When this happens, the engine I forced to work much harder to expel these gases. This often results in the engine bogging down 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?

Need advice from certified mechanic? Get help now!

Over 1000 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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car making noise.

The catalytic converter on the exhaust system would need replacement if it is clogged with debris, or broken apart inside, which would also clog the exhaust. I recommend that you have a mechanic, such as one from YourMechanic, come by...

Q: Car is shifting hard using a lot of gas and getting hot

Hey there. This may be due to a few different things such as a transmission speed sensor, a failing transmission control module, or potentially low transmission fluid. As you may know, the transmission uses hydraulic pressure created by the...

Q: Opinion about leveling kits less than 2 inches on a 2007 Ford F-150 2-wheel drive

Let me tell you something, trucks are designed by engineers and Ford engineers are pretty good engineers. They are designed so that their backs are a little higher than their front for a reason and they perform better that way....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.