Below are some of the common warning signs that indicate faulty spark plugs in a car.
- Engine Misfiring. An engine misfire results in the engine to stop for a moment and then regain its normal operation.
- Starting Trouble.
- Increased Fuel Consumption.
- Lack of Acceleration.
- Uneven Idling.
What causes a car to misfire while driving?
The most common causes of engine misfires are: worn spark plugs, weak fuel injector, vacuum leak, worn valve seals, carbon tracking, and no voltage at the coil. Misfiring engines should be looked at as soon as possible, as the problem can worsen over time and damage internal components of the vehicle.
How much does it cost to fix a misfire?
It depends on the cause. For example, if the misfire is caused by a bad on-plug ignition coil, which is quite common on many newer cars, the repair might involve replacing a bad coil and all the spark plugs. This could cost $300-$400 for a 4-cylinder engine or $450-$700 for a V6.
Can a misfire ruin an engine?
In the longer term, continuing to drive it that way could destroy a coil and cost you more money. If, however, the misfire is caused by an injector problem, you could seriously damage your engine. Running that cylinder too lean will cause it to overheat and potentially damage the valve or the piston.
Photo in the article by “Car Talk”