Skip the auto shop - Our mechanics make house calls

Q: Hesitation at RPMs lower than 2000

asked by on

My vehicle has hesitation problems at RPMs lower than 2000. While driving and accelerating up to 2000 RPM, this problem occurs. It seems like it doesn't get enough fuel or air. This is not such a big deal when the engine is cold. The car drives well at RPMs higher than 1700. I had a fuel filter and air filter replaced. Also, the MAF sensor and fuel injectors were cleaned. There are no error codes appearing. Several mechanics ran diagnostics and cannot find the reason for this and the hesitation issue persists. Can you give me some advice? Thank you.

A: The vehicle may have unmetered air entering...

The vehicle may have unmetered air entering the engine, which is air entering the tubes between the mass airflow sensor and the throttle body. If there are no leaks, then the fuel trims in the data would need to be inspected, to determine if the two front O2 sensors would need to be replaced with the new part number. The O2 sensors give fuel control feed back to the ECM and if the system is too lean you will get a part throttle hesitation. The technical bulletin is 03-09-11 and the new part number to replace the O2 sensors is 3S4Z-9F472-BA. This part may have been updated since the bulletin. If you need to get your O2 sensors replaced, consider a certified mechanic, such as one from YourMechanic to come to your home or office to replace your O2 sensors.

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: Can a collision in the front of my car cause a mass air flow sensor to malfunction? I need to make a claim for the insurance.

Unless the sensor has been physically damaged by the accident you were in, it would be impossible to know if it was damaged by the accident or not. The MAF sensor is a common sensor to fail on these vehicles...

Q: My car is on anti-theft mode and I can't turn my car on. I don't have a key for that

Hey there. The vehicle has an integrated anti-theft system that can not be turned off or bypassed for a no start. If you lost all the factory keys, then you will need to have new keys made and programmed using...

Q: Can a power steering leak make a car jerk?

If the fluid level is low, or there are other faults such as a loose power steering pump drive belt, you might experience that effect, that is jerking and/or lack of smoothness in the steering feedback that you feel when...

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...
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...