Skip the auto shop - Our mechanics make house calls

Q: I can't accelerate or go fast while driving - 2002 Nissan Sentra

asked by on

When I fully step on the accelerator the vehicle will be moving at a speed of 40kmh and I can't even over take other vehicles

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

Hi there. The lack of acceleration you feel suggests several possibilities. There could be low fuel pressure caused by a faulty fuel pump or a faulty fuel pressure regulator. It could be a lack of incoming air to the engine caused by a very dirty air filter or a faulty MAF (mass airflow) sensor, incorrectly calculating the incoming air to the engine.

A restricted exhaust system caused by a plugged catalytic converter is also another possibility. There are more possibilities: a faulty TPS (throttle position sensor), engine or ignition timing problems, etc. I recommend having your vehicle’s [lack of power during acceleration](https://www.yourmechanic.com/services/car-is-not-getting-enough-power-inspection diagnosed and repaired by a certified technician, such as one from YourMechanic.

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: Ignition switch

It sounds like you may have a faulty ignition switch. As you may know, your ignition has several circuits: Always On - Connected directly to the battery and is not affected by the ignition switch. This includes: alarm, interior lights,...

Q: All dashboard lights and tail lights do not work after driving through a lot of snow. Headlights work. And brake lights work.

Hello. We'll be happy to help you. There are a few things that I recommend checking to discover why your lighting system is malfunctioning. The headlight dimmer switch should be checked. Along with the wiring harness above the right front...

Q: My acceleration is very poor

This can happen for a variety of reasons, however what is most commonly associated with the symptoms you describe is a faulty throttle position sensor. This is a unit that monitors the position of your foot on the gas pedal...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.