Q: The car accelerates slowly, hesitates and shudders

asked by on

My car started having some issue the other day, while I was driving and tried to accelerate very quickly. The car seemed to lose power and there was a delay in picking up speed. The engine hesitated and if I attempted to accelerate more, it would shudder. The problem is the same if the car idles at the red stop and I try to accelerate. I fear that it would stall, so in those situations I put it in park just in case. Occasionally, the engine seems to gather the speed quickly and but the car wouldn't run fine afterward. It would then hesitate and shudder yet again. The check engine light is on as well. The car shakes only when it is put in drive, not while I accelerate from neutral. I had the spark plugs replaced. What is causing these issues? Is it a serious engine problem?

Unmetered air can cause this type of hesitation and shuddering. Too much air compared to fuel will cause a lean misfiring condition. Fault codes need to be read out of your Mercedes C320’s engine computer to see if there are any underlying issues and those issues are corrected.

The induction should be inspected and checked for vacuum leaks. Also, fuel pressure and volume should be checked as well if the induction system checks out okay. A partially clogged fuel filter can cause a starvation issue on heavy acceleration. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the tools and expertise to conduct this type of diagnosis and repair for your acceleration issue.

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. The car accelerates slowly, hesitates and shudders

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: Q: Car vibrating when accelerating

Depending on the vibration, this can be caused by broken engine mounts. The mounts are meant to absorb the vibration of the engine as it runs. When mounts break, the rubber that absorbs the vibrations can break off completely and...

Q: Car stalls unless pressing gas for 5 minutes, stutters whle accelerating or pressing/releasing clutch

The first thing you should do is watch my video "how to fix a car that idles poorly." Just cleaning the throttle assembly with a throttle cleaner and maybe the MAF sensor with the MAF sensor cleaner can often fix...

Q: Air suspension not working

Hi there, with the Airmatic malfunction the car is telling you the tire pressure is low probably causing a flat tire. A nail or small leak would allow you to hear the tire releasing air. A qualified mechanic, like one...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.