Q: Q: 2004 Hyundai Sonata jerks while accelerating from stop.

asked by on

2004 Hyundai Sonata jerks while accelerating from stop. Doesn't happen when i put it in slap shift on 2nd gear and higher. As I am accelerating I get to 1000 rpm it jerks, then to 1500 rpm it jerks, and then to 2000 rpm it jerks. After I hear it shift it stops. What is wrong?

My car has 111000 miles.
My car has an automatic transmission.

This may be related to a dirty or failing mass air flow sensor. The mass air flow sensor monitors the air intake as it enters the motor and relays this information to the ECU which then makes adjustments to create the perfect air/fuel mixture. When this is not working properly, this may cause an imbalanced load of air/fuel to be injected into the motor causing the jerking reaction you have experienced. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your car.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Q: 2004 Hyundai Sonata jerks while accelerating from stop.

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 cracked fuel line/pipe cause an o2 sensor to go bad?

Hello, thank you for writing in. The fuel line being cracked is going to cause issues with the way the engine runs, and a lean or rich air/fuel mix will cause the oxygen sensors to detect the difference in carbons...

Q: What would cause brand new O2 sensors to give codes 172, 173, 176, and 177, rich and lean conditions, both sides at the same time?

When it comes to across-the-board codes being set such as this, it is usually a result of something "upstream" creating the condition to set all these codes. For instance, it is rare for both O2 sensors to fail at exactly...

Q: Do you have to do a factory reset on my car ?

Hello. If everything was done correctly then it should start right up. If it is not getting spark or fuel then I would check the crank signal. If the crank sensor is not sending a good signal then the computer...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...