Skip the auto shop - Our mechanics make house calls

Q: Car jerks after taking foot off gas

asked by on

When I take my foot off the gas, the car jerks and makes a sound like a crumbling plastic bag. I noticed that the transmission fluid is dirty, but was told not to flush because it's a high-mileage car.

A: I’m not sure about the "plastic bag no...

I’m not sure about the "plastic bag noise". The jerking upon deceleration could have something to do with the transmission not downshifting properly; this could be due to internal transmission mechanical problems, or a problem with the electronic transmission controls. Flushing or changing the transmission fluid generally doesn’t help if you already have transmission problems. In fact, it usually makes things worse. I suggest transmission fluid exchanges (not flushes) as preventive maintenance for all vehicles. For your vehicle, I recommend that you have a professional, such as one from YourMechanic, inspect your Kia’s transmission, and run a diagnostic inspection of the noise you are hearing.

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: Failed to downshift to lower gear

Greetings. The humming noise is likely caused by a faulty PCV valve or oil trap hose. The engine of the vehicle produces a lot of suction and the PCV valve and hose is made to regulate some of the suction...

Q: The dealer wants to change the timing belt and tensioner on my '04 Jetta. They also say the water pump should be replaced as well

Hi and thank you for contacting YourMechanic. You are only required to change the water pump if it is leaking or if the bearing is going out. They may say this is preventative maintenance, but you could hold off on...

Q: Is my ECM malfunctioning?

Unfortunately, without additional detail as to the codes showing up, there is no way to diagnose what the issues may be. The alternator may be functioning intermittently without having a dramatic impact on the charging system for example. I would...

Related articles

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...
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.