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.Continue Reading
According to Larry Carley from "Import Car Magazine," one cause of a car's jerking is a clogged fuel injector. A dirty fuel injector doesn't deliver the correct dose of fuel, causing a lean misfire, which feels like the car is jerking. This often occurs when cheaper gas is used because some suppliers use less detergent to keep costs down. The fuel injector can be cleaned using fuel additives.
According to the Ford website, a dirty filter can also cause a car to jerk. The fuel filter optimizes the ratio of fuel and air in the engine. If the car jerks when the RPMs go up, this is a sign that the filter needs changing, typically at a service station.
According to the Samarins website, one of the most significant issues that causes a car to jerk is a faulty transmission. The transmission shifts the car between gears. So, if it is starting to fail, the car shifts hard. The car might just need more transmission fluid or a flush. If the gears inside the transmission break, though, then the transmission either has to be rebuilt or replaced.Learn more about Car Parts & Maintenance
Cars idling rough at stops can have many causes, including damaged sparkplugs, improperly installed sparkplugs or damage to the car's fuel injector, carburetor, vacuum hoses or ignition wires. It is important to take a car to a certified mechanic soon after it begins idling roughly in order to prevent more expensive damage.Full Answer >
Test the voltage of a car battery when the vehicle is off and when attempting to start it after you disconnect the ignition or fuel injector pump. Batteries should test in the normal range without a load, and the reading should remain above 9.6 volts when cranking for a maximum of 15 seconds. If you do not have a voltmeter and the car starts, take it to an auto parts store and have the representative check the battery.Full Answer >
One common reason a car dies while driving is a bad fuel filter. Filters require replacement approximately every 30,000 miles, according to Chilton. Without replacement, debris and varnishes from the fuel tank eventually stop the flow of fuel, causing the engine to stall.Full Answer >
A dead battery, bad starter connection, faulty ignition switch and a clogged fuel filter are all factors that make a car hard to start. In cold weather, the slow evaporation of gasoline and coagulated oil also contributes to starting problems.Full Answer >