Skip the auto shop - Our mechanics make house calls

Q: Backfires around 70 mph and feels like gas might cut off at low speeds

asked by on

i will be on the hwy and it will start to back fire around 70 mph and at low speeds like 20 it feels like fuel cuts out or something

My car has 15000 miles.
My car has an automatic transmission.

Hello - fuel starvation or failing ignition could cause the behavior you are experiencing. If you accelerate from a standing start up a long hill, does the engine behave in the same way in each gear? Ignition problems will show up faster during the acceleration process than a fuel supply issue (weak plugs, wires, coils or ignition module). Fuel supply issues (clogged fuel filter or weak fuel pump) will show up a few seconds later. If you would like to have this issue diagnosed, a certified technician from YourMechanic can come to your car’s location to inspect the backfiring problem and follow through with repairs.

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

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. Backfires around 70 mph and feels like gas might cut off at low speeds

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: The car won't start after the gas that was a few days in the sun, is put in

Hello. The gas that you used should not have any problems after only a few days. If the fuel was that low, the issue may be a failed fuel pump. When the fuel gets this low, the pump overheats and...

Q: Ignition problems at the distributor.

Hello, thanks for writing in. I'd be happy to help. This is common as you supply power to the coil once the key is in, which will cause the ground to change. If you are not getting spark then the...

Q: Headlight malfunction

Hi, it is likely that you simply have a blown headlight on your 2009 Chevrolet Spark. There are low beam light bulbs and high beam light bulbs on your vehicle. Which bulb activates depends on the position of the headlight...

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 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.