Q: Struggling to go uphill and muffler sounds get louder and strong smell of gas fumes.

asked by on

Why does my truck struggle going uphill and is loud and I can smell gas fumes?

My car has 232000 miles.
My car has an automatic transmission.

It 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 this 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. Struggling to go uphill and muffler sounds get louder and strong smell of gas fumes.

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: Leaking oil into the intake and PCV and catalytic converter

You would need to have the entire crankcase ventilation system checked and serviced first to make sure all the PCV valves are clean and working correctly, or if excessive oil will be consumed and get in the intake. The turbo...

Q: Truck shaking at steady speeds at about 40 kmph

Erratic shifting into gears too early will cause overloading of the engine and the shaking you feel. An engine that misfires under load may miss when at this speed before shifting into overdrive. If the transmission is shifting into overdrive...

Q: There is green fluid that came pouring out from the bottom of my car up by the driver side tire. I have 2009 nissan Maxima.

Green fluid in most cases is going to be coolant. If the car is running you will usually notice some sharp smelling steam as well. Best to stop driving the car until you can locate and repair the leak. The...

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 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...
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...