Skip the auto shop - Our mechanics make house calls

Q: Car not accelerating and doesn't always start

asked by on

My car is not accelerating past 20 MPH. It goes very slow and shuts off when idling. The car also doesn't start sometimes and I have to sit and wait until it does.

A: Your issue sounds like it could be a failed...

Your issue sounds like it could be a failed fuel pump in its last moments of life. With lack of fuel the vehicle will run very poorly and will not be able to accelerate and won’t be able to run at idle unless kept running with the gas pedal. Your issue could be coming from multiple other things as well. The vehicle could be in what is called "limp home mode" which is where the computer controlling the engine management system sees a serious problem that, if left alone, could cause major engine damage. The computer will enter this mode to keep catastrophic failures from happening. A proper diagnosis of your accelerating issue should be carried out to find the cause.

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!

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: Engine not reving past 2500 rpm

You will need to have the computer scanned for codes that caused the Check Engine Light to come on. Once the code is diagnosed then you will find out if the fuel is contaminated with water. You may have an...

Q: Car wont run

Hi There, It sounds like you may have a fuel supply problem in getting the proper amount of fuel to the fuel injectors. As you know, when you turn the key to on, the fuel pump is activated and the...

Q: No start anti-theft light blinks a code 1-6

Your anti-theft light is blinking due to the theft system is activated and will not allow the vehicle to start. The code 16 is not something that is used by mechanics in the field but was used by engineers in...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.