Skip the auto shop - Our mechanics make house calls

Q: The car accelerates with delay

asked by on

Hi. My car has around 115,000 miles on it. When I try to accelerate, it takes a longer time than usual to increase the speed. It would happen at lower speeds. If I drive at 30 mph and give it gas, there is no acceleration until I apply the gas pedal to the ground and keep my foot on it for a longer period. I took the car to the dealer and they said everything is okay after hooking a scanner to it. What could cause this? Thanks.

Hi there. This can be caused by a number of things. Since the dealership installed a scan tool and didn’t see any codes then it must not be a sensor failure. I typically start by checking the back pressure of the exhaust to see if the catalytic converter is failing. If it is fine then I check the fuel pressure as a weak fuel pump will cause this. If that is also fine it may have a dirty mass air flow sensor. These are all the most common causes of this. If you want to have this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to check it out.

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: Transmission uses oil and engine light is on. Why is it using oil in low and the transmission slips?

Hi there. If the transmission oil is low, then the transmission oil filter cannot pick up any fluid and cause the transmission to slip as the clutches are not able to apply. The Low application piston requires a mass amount...

Q: car studders when it revs high

If the engine is revving high, but not picking up speed especially in higher gears this is an indication of a transmission issue. The hard starting would not be attributed to the transmission, so another issue could be present, for...

Q: My traction control and stabilizer control warning light is on what does it mean

Hi There, As you may know, the traction control light and oil change are unrelated issues. The traction control system monitors the steering and stability of the vehicle and engages when loss of traction has been detected. This is done...

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...
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...
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...