Q: Hesitation when I push the accelerator.

asked by on

Sometimes there's a hesitation on start. I am not sure if it is fuel pump related or not.

Hi there, The problem you are having is most likely due to the fuel pressure not holding it’s static pressure to the injectors. The fuel system needs to hold fuel pressure to the injectors in order for the injector to spray fuel into the engine as soon as you start cranking your engine. If the fuel pressure drops after you shut off your vehicle then the next time you crank your engine the injector will open, but there is no fuel there to inject into the engine and it will take about five seconds of cranking to get the fuel pressure built up enough to start injecting fuel to start the engine. YourMechanic can diagnose your hesitation problem, they would need to test the fuel pressure and isolate the problem as being the fuel pump check valve, regulator or a leaking injector. If it was an injector then you would have a rough running engine until the excess fuel gets burned off. Once tested and the failed component is isolated, then the repair can be done.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Hesitation when I push the accelerator.

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: My steering wheel locks up and the car turns off whenever I slow down.

Hi and thanks for contacting YourMechanic. The steering wheel lock solenoid is shorting out when driving the vehicle. To fix this, you will need to disconnect the battery and remove the steering wheel and airbag assembly. Then remove the turn...

Q: The check engine light is on. P0158 code!

Hi there. I think you'll find this article on the P-0158 OBD-II error code helpful, as it will explain common causes, solutions and symptoms related to the code.

Q: My car has excessive vibrating sometimes. Is it the ball joints?

With over a quarter million miles on your car, it really could be anything. There are about a dozen moving parts in your car's front end that are subject to wear, including the ball joints. Any number or combination of...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...