Q: Car stops accelerating, motor stalls, what can I do?

asked by on October 29, 2015

My 2010 Ford Fusion ran fine for the first 70,000 miles but now has started to randomly decelerate when my foot is still on the accelerator. This is a serious problem. The car stalled out at a couple of times when I stopped, which I thought was unusual for an automatic. But, I didn’t think anything serious was happening. Now I think those things are related and something is broken that is making the accelerator not work. How can I properly diagnose this problem?

Before the advent of modern computer controls, the driver of a vehicle was in direct connection with many of the systems they were controlling. Power accessories (locks, windows, etc) were directly linked to the switches at the driver’s finger tips. The accelerator pedal used a cable to transfer the driver’s force to opening the throttle blades. In the increasing push for efficiency, modern vehicles use sensors and actuators to communicate the driver’s requests, removing the direct links. In the event of a malfunction, the output performed may be vastly different what the driver requested. I believe the best strategy given your symptoms would be having a certified technician inspect your Fusion, and look for signs of failures in the electronic throttle control (ETC) system. Any faults will almost certainly be logged as diagnostic trouble codes, and the technician can begin diagnosis from there. Because the ETC system is responsible for countless cycles of opening and closing the throttle blade, it wears out just like any other part. Thankfully, the parts in this system are relatively inexpensive, and if properly diagnosed, can be changed in less than an hour.

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

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

F150 ecoboost poor gas mileage

You should not see the engine oil get higher unless you have excessive fuel getting into the engine from a leaking injection system like a leaking injector. You should have the fuel pressure monitored when the key is cycled on...

My dodge charger 2010 sxt keeps locking itself making the honk noise. How can I turn this annoying sound off? Please help.!

Sometimes a faulty battery can cause this. Have the battery load tested to determine its condition. Other causes of horn malfunctions are electrical shorts that occur intermittently as well as possible software glitches in the body control module and/or security...

Car loses power while driving 2001 Ford Focus

Hi there: This issue is commonly caused by three different systems, ignition system, fuel system and the emissions system components including O2 sensors and the EGR Valve. The best way to know for certain and before you spend any money...

Related articles

The Best Used Cars to Buy If You're a Dog Breeder or Trainer
These These days, dogs are more and more likely to travel with people than ever before. After all, what dog doesn’t ride in a car? As a breeder and trainer though, you’re probably more likely to carry along dogs than...
How to Replace a Car Throttle Cable
Throttle cables link the accelerator pedal to the throttle plate. This cable opens the throttle and lets air into the engine for acceleration.
2012 Ford Fusion vs. 2012 Toyota Camry: Which Should I Buy?
While most people believe that domestic sedans just cannot compete with the Honda Accord and the Toyota Camry, the industry leaders, that is not necessarily true. Yes, there are some metrics where the Camry just excels, however the Ford Fusion...