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.

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 1,000 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
  1. Home
  2. Questions
  3. Hesitation at RPMs lower than 2000

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: What is a throttle body filter

I'm not sure why you are getting the definition of "throttle body filter" for the code P0068. The definition I come up with is throttle body air flow performance. In fact, all of your codes are having to do with...

Q: Fuel supply related to engine misfire?

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark...

Q: how do you know if you need a whole throttle body compared to just cleaning it or replacing sensors

I would recommend cleaning and replacing the sensors first. Generally, throttle bodies do not need to be replaced completely, but rather just need specific parts related to them replaced. I would also recommend checking the mass air flow sensor to...

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.