Engine occasionally cuts out while idling at a stoplight ...

Q: Engine occasionally cuts out while idling at a stoplight and occasionally hesitates and bucks upon acceleration.

asked by on February 17, 2017

the engine will occasionally shut off if I am idling at a stoplight or in a drive through. Also, it occasionally hesitates and then surges or 'bucks' upon accelerating from a stop. The engine always starts back up. I have also noticed that it will sometimes hesitate to start if (for example) I have driven to the store,gone inside for a few minutes and then upon starting it again to leave.it hesitates to start. I am wondering what could be causing these symptoms. there are no check engine lights .

My car has 152000 miles.
My car has an automatic transmission.

There is a issue with the fuel delivery to your engine. It seems as the fuel pump may be failing. Check the fuel pressure on the fuel rail and see if there is at least 30 psi. If the fuel pressure is low when the engine is revved up, then the fuel pump is not producing enough flow to keep up with the demand. If there is pressure, then the fuel pressure regulator is not working. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your fuel system.

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

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

ABS comes on when not needed

The ABS and traction control are part of the same system. The electronic brake control module (EBCM) receives input from the wheel speed sensors, as well as other vehicle sensors. It then uses this information to apply the brakes and...

Won't start after fueling - 2008 Kia Rio5

Check for spark at the plugs when this occurs. If there is no spark, check for a bad crankshaft position sensor (heat failure), and also for a failed connection between your ignition key, which is part of the electronic path...

Leaking pink water fluid towards the front left side of the car.

It sounds like you may have damaged the radiator. Some coolant is colored green and some is colored reddish-orange, depending on the coolant used. A certified technician, like one from YourMechanic, will be able to conduct a few tests to...

Related articles

Symptoms of a Bad or Failing Cylinder Head Temperature Sensor
Common signs include long cranking time, engine performance issues, and the Check Engine Light coming on.
How Long Does a Cylinder Head Temperature Sensor Last?
The The engine’s performance is largely based on temperature measurements performed by the engine control module (ECM), also known as the vehicle’s computer. As the temperature of the engine increases, the resistance decreases which means the voltage drops. The computer...
The Best Used Cars to Buy If You’re an Architect
Obviously, Obviously, architects appreciate beauty and symmetry. This is not just the case when it comes to their building projects, but also in terms of the vehicles they choose. We have evaluated several used cars, and identified the Mercedes...