Q: CAT got clogged, backfire and nowturns over but no start and gas smell

asked by on

I was traveling about 50 mph and noticed a slight sputter.. went away for a few seconds and then started to sputter even worse when applying gas.... and then BANG!!! sounded like a gigantic backfire is all i can assume it was but as soon as the bang it died. i pulled over and cranked it for a minute, it started after a few tries but died immediately. There was a strong sulfur smell and sure enough it appeared the cat was clogged so i cut it out to see if i could start back up. No good, just and extreme gas smell and turning over. What do i do now??

My car has 190000 miles.
My car has an automatic transmission.

In most cases, the ’bang’ you hear is an explosion of excessive carbon inside the cat itself and more often than not stays contained inside the catalytic converter or expelled out the muffler tail pipe. In some cases however, it may damage ignition system components, sensors, cylinder head hardware or worse, piston connecting rods. I would start by having a professional mechanic come to your location and complete a car will not start inspection; as they will be able to provide better direction after inspecting your Blazer.

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. CAT got clogged, backfire and nowturns over but no start and gas smell

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: Rocker Arms

Hi Ricky. Thanks for contacting us today. Today's modern engines don't have older style; individual rocker arms. They are in an assembly (or multiple ones) that are replaced as a set if one is damaged. Intake rocker arm assemblies are...

Q: I have a 1984 camaro. My passenger side window won't go up or down

Since your window moves a few inches, my first guess would be the regulator. But your car is over 30 years old so it could be anything or any combination of things. The parts are not expensive, so it wouldn't...

Q: Dies unless pressing gas pedal

Hi There, This is usually an indication of a fuel supply or low fuel pressure problem, which may be a result of clogged fuel injectors, a bad fuel pump or possibly a faulty fuel pressure regulator. Any of these may...

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...
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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...