Skip the auto shop - Our mechanics make house calls

Q: Jerking/studdering problem

asked by on

My 04 Hyundai Santa Fe is acting up. I've sent it to the mechanics thinking I had a misfire but they say it isn't that or the spark plugs it's just the fuel system needed cleaning. So we allowed them to "clean" the fuel system. It stopped for a couple of weeks. At first when I would put the SUV in gear it would have a jerking motion. But it wouldn't happen all of the time. And after a few minutes it would stop and run fine. It did that for a few days then it stopped. And it's been several weeks since the "cleaning" and now it's acting up even at idle. It will have a hard "jerk" once then it will idle fine. It hesitates sometimes when driving and even now it will jerk once or twice while driving. And I am only going maybe 45-50mph. And sometimes when pressing the gas it will do this soft jerking thing. I am assuming it is the fuel pump and or filter. But it is inaccessible for my vehicle unless they drop the tank. Any ideas before I pay the money to have this replaced?

My car has 140000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. This is a common sign of a failing mass air flow sensor. This is a unit that regulates the air flow into the engine as it is mixed with fuel prior to being injected into the engine. When this is not working properly or is dirty, this can cause an imbalanced load of air and fuel to be supplied to the motor. When this happens, this will cause the jerking feeling that you describe as the motor is starving for fuel. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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: Will broken Axel Rings Cause check engine to go on?

I'm going to go out on a limb here and say it is very possible that the computer is performing a rationality test by comparing the inputs from VSS and ABS wheel speed sensors (WSS). When it doesn't see the...

Q: Bad smell in cabin..when driving the car.

Your car has what is called a cabin filter which filters the outside air as it comes in through the vents into your car. When these get dirty or clogged with debris, they can give off a very dirty smell....

Q: Paid 1438.00 for cat sensor bank one and two was that to much?

Hello Laura. Without having a detailed invoice as to what repairs, labor and service was completed recently on your Tucson, it's hard to tell you whether or not your cost was excessive. I can say that most local shops and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.