Skip the auto shop - Our mechanics make house calls

Q: Car begins to decelerate and lose power as im driving.

asked by on

After driving a little my car begins to jerk and lose power to the engine. I was pressing the gas all the way down but my car was only going around 5 mph. Also at very slow speeds it cuts off completely amd i have to re start my car. Any advice will help. Thank you

My car has 180000 miles.
My car has an automatic transmission.

Hi there. The most common cause of this on your car is either a restriction in the exhaust caused by a failing catalytic converter, or a fuel system issue. Low fuel pressure will cause this and that would typically be due to a failing fuel pump. I typically start by testing the fuel pressure when this is occurring to see if it is falling off. If it is then the fuel pump is more than likely failing. If not then I check the backpressure form the exhaust to see if it is restricted. If it is then the converter needs to be checked and replaced. I have also seen the turbo fail on this vehicle and cause this, but that is not as common. If you would like to have this power loss and stalling problem checked out, consider YourMechanic, as a certified mechanic can come to your home or office to [diagnose why it is losing power] https://www.yourmechanic.com/services/loss-of-power-inspection

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. Car begins to decelerate and lose power as im driving.

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: 1987 keep Comanche Ac came on when my friend added a little 134 did not cool high side got really hot. I turned off and evacuated

Hi there. Before you attempt to complete any repairs or activate the system further, I would highly recommend having a professional mobile mechanic from our team come to your location and complete an AC inspection. This will allow them to...

Q: When try to give my car a lot of gas at once it bogs down and wont trys to shift

Hi There, It sounds like you may have a fuel starvation problem due to a lack of sufficient fuel pressure. This can happen when the pump itself is not working properly or when the fuel pressure regulator is not maintaining...

Q: The check engine light is on and it's say gas cap what price range am I lookin at to have it fixed

If you are referring to the warning light for a loose gas cap loose and/or Diagnostic Trouble Code P0442, a loose or defective gas cap is merely one possible reason for the warning light or the Code. You could have...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...