Q: Q: Jerking reaction when accelerating

asked by on

It started as with left turns. Any time I would make it, it would make a squeaking sounds then almost pause before it would accelerated causing a small jerk, now it does it just driving straight.

My car has 118000 miles.
My car has an automatic transmission.

This may be a couple of different things. When a transmission is low on fluid, this can cause a jerking reaction as you describe. Automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car’s computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When the transmission is low on fluid, this can cause a jerking reaction as you describe.

This may also be related to something called a mass air flow sensor. The mass air flow sensor 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 recommend having an expert from YourMechanic come to your location to take the car for a test drive to more specifically determine the cause for this type of jerking reaction.

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
  1. Home
  2. Questions
  3. Q: Jerking reaction when accelerating

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: Hazard lights flash around 5 times well after car is locked

Hi there. There are some times when an electrical glitch or error code is stored in the ECU that will trigger "odd" electrical problems like you've listed in your question. The best way to determine why this is happening is...

Q: Trying to get an estimate on how much it'll be to replace the motor for electric power steering.

There was a Ford recall involving the power steering system on your model so you should check with Ford to be sure that any warranty related work was already performed or perhaps should be performed. Hopefully, you have already received...

Q: excessive fuel consumption I put genuine spark plug and wire plug set it was 125 lm now 145 km per 20 liters?what is problem how c

Hello. It is difficult to get much better fuel economy then what you are currently getting. The only way is by driving the car easy and maintaining it. Using synthetic oil, a high flow air filter, making sure that the...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...