Moisture in the distributor cap can cause a car to jerk when accelerating. When a car has been parked overnight in cold temperatures, moisture can form inside the distributor cap, causing the engine to misfire when accelerating. A misfire occurs because the engine power is off balance or uneven. Parking a vehicle in a garage or a warmer environment helps prevent moisture from forming.Know More
If the vehicle continues to jerk while accelerating gradually over a prolonged time period, a vacuum leak may be the cause. A vacuum leak occurs when the fuel system creates a vacuum in the engine, causing the vehicle to spring forward when the gas pedal is pushed. The vacuum leak sends an incorrect amount of fuel to the engine, causing the vehicle to jerk when accelerating.
If the vacuum leak is not the cause, a car may also jerk when accelerating if it has a faulty throttle position sensor. This occurs in vehicles equipped with a fuel-injection system. Once the gas pedal is pushed, the data in the sensor allocates a certain amount of fuel to disperse. When the throttle position sensor is faulty, it transmits incorrect data, which in turn sends the wrong amount of fuel to the engine.Learn more about Car Parts & Maintenance
The effects of eco mode vary depending on the manufacturer, but in general, it makes some power from the car temporarily unavailable to enhance the gas mileage. Most manufacturers state the eco mode increases fuel economy 5 to 10 percent. These gains could also be realized by practicing more conservative driving in a car without an eco mode.Full Answer >
Reasons for a car running rough can include problems with the engine temperature or oxygen sensors, bad hoses, ignition system or timing problems, clogged air or fuel filters, and faulty spark plugs or fuel injectors. Many problems that manifest through a rough idle can be easily fixed.Full Answer >
There are a variety of problems that can cause a car's idle to be rough. A rough idle is usually defined by the car idling below its normal speed, loping RPMs, a skipping sound or in a way that causes the car to shake. Idle problems can often be a clue to something more serious going on, so it is best for car owners to get them checked out.Full Answer >
A car jerks because of a clogged fuel injector, a dirty fuel filter or because the transmission is about to fail. If the engine is manual rather than automatic, then the car might jerk because of improper shifting.Full Answer >