Engine hesitation can be a result of low fuel pressure, vacuum leaks, worn or dirty spark plugs or bad spark plug wires. A weak ignition system can lead to misfiring, which can also cause hesitation.Continue Reading
Engine hesitation is usually caused by an air/fuel mixture that is too lean, meaning there is too much air and not enough fuel in the engine. This makes it hard for the spark plugs to create the combustion needed to sufficiently power the engine. This problem may be caused by a bad air flow sensor, a faulty throttle position sensor or poor computer operation. If the vehicle's computer is reading the signal from the air flow sensor incorrectly, it can cause the computer to fail to add enough fuel to the mix, making the mixture lean, and causing hesitation and drag.
It is possible to find out the cause of hesitation by running a few tests. Computer scans can pull fault codes, including misfire codes, and additional tests will help to check fuel pressure and find vacuum leaks. Pulling the spark plugs is another test that is easy and inexpensive to perform, since hesitation can be caused by a spark plug that is dirty or improperly gapped.Learn more about Car Parts & Maintenance
There are numerous reasons a car stutters when accelerating, including vacuum leaks, wiring issues and faulty sensors, according to AutoHub 360. In some cases, bad weather can cause this problem. When the engine is cold, moisture can collect on the distributor cap and cause the electrical current to the engine to misfire. When a car stutters during acceleration, it is a symptom of an underlying engine issue.Full Answer >
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 >
Common fixes that solve on-board diagnostic fault codes in a vehicle include replacing the oxygen sensor, tightening or replacing the gas cap, replacing the catalytic converter, replacing the mass airflow sensor and replacing one or more spark plugs or spark plug wires. Check your vehicle's on-board diagnostic system using an ODB II fault code scan tool, or bring the vehicle to an automotive repair specialist to discover the precise cause of the error.Full Answer >
There is no specific time to change spark plug wires but an ideal time would be when fuel is being left unburned because there is not enough voltage to burn the fuel.Full Answer >