There are a variety of signs of bad spark plugs including difficulty with starting an engine, a rough idle and an increased consumption of gas. Other signs include an engine that has a sudden surge when driving and diffi... More »

Spark plug replacement intervals for cars vary on the type of spark plug installed in the car. Spark plug life can vary from 10,000 miles for copper spark plugs to over 100,000 miles for iridium spark plugs. More » Vehicles Car Parts & Maintenance

Parts that show signs of wear and tear, especially discoloration, melted aluminum and scrapes, should be replaced when rebuilding tractor engines. Examples of parts that can be replaced include the crankshaft, gaskets, o... More » Vehicles Car Parts & Maintenance Engine

A spark plug is a device that produces an electrical spark, which ignites the mixture of fuel and air in the engine's combustion chambers. A spark plug initiates the combustion in the internal combustion engine. More »

There are several steps to changing spark plugs, beginning with making sure the engine is completely cool. Next, remove one spark plug wire by gently lifting straight up from the spark plug. It is important to change one... More » Vehicles Car Parts & Maintenance

When a vehicle has problems starting, idles roughly, the engine misfires or surges, lacks acceleration or has a noticeable decrease in fuel efficiency, the spark plugs may not work properly. Spark plugs may cease working... More »

The signs of a failing ignition coil include backfiring, starting issues, lowering gas efficiency, engine misfiring, vehicle stalling and worn out spark plugs. The most common symptom of a faulty ignition coil is when th... More »