Skip the auto shop - Our mechanics make house calls

Q: Truck starts to hesitate under load

asked by on

Truck starts to hesitate under a load

My car has 106000 miles.
My car has an automatic transmission.

This may be related to low fuel pressure or potentially a failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this is dirty or faulty, this causes an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

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

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: Leaking coolant

In order to locate a leak, you will have to have the cooling system pressure tested to detect where the coolant leak is coming from. Have a mechanic pressure test the system and look for leaks at the intake manifolds...

Q: Car cuts off when driving. I replaced the plugs, coil, fuel pump, plug wires, and the gas cap. The light came on for the gas cap.

Hi there. Check the fuel pump relay and see if the relay is working. It is possible that the relay could be getting hot or have a loose connection within the relay causing the relay to stop working from time...

Q: Sometimes the truck will start and run just fine, and other times it will barely want to start and I need to press the gas pedal

Hello. This can be caused by a few different things. If the vehicle will run by pressing lightly on the gas pedal then it may be a bad idle control valve. If it sticks, it will allow too much air...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...