Air Filters

The problem: Your air filter needs to be changed. This is the most important filter in your car.
Consequences: A clogged or restricted air filter may hinder airflow and draw contaminants into the engine. With today's finely tuned fuel injected systems, this not only leads to poor fuel economy but causes premature wear to the fuel injectors and moving components in the engine.
Solution: Most air filters can be easily replaced, so we encourage customers not to risk it.

Fuel Filters

The problem: Your fuel filter needs to be changed.
Consequences:Fuel filters become clogged with dirt and debris during normal operation and should be replaced to: increase performance, extend fuel pump life and aid in fuel economy.
Solution:Unlike air filters, fuel filters are unable to be visually examined to determine if they require replacement, that's why it's important to replace a fuel filter on a regular basis, to ensure it's operating correctly and doesn't become blocked. Fuel filters are often mounted in hard to reach locations, including inside the fuel tank. This is a sample of fuel drained on to white paper from the inlet side of old fuel filter, just look at the mess. Has your fuel filter been changed recently?

Spark Plugs

The problem: Your spark plugs need to be changed.
Consequences:A spark plug ignites the air / fuel mixture in the combustion chamber by creating an electrical spark. The spark plug has positive and negative electrodes. The positive electrode receives an electrical charge generated at the ignition coil, which jumps across an air gap to the negative electrode. The spark plug ignites the air fuel mixture to create an explosion that will push down on the piston, which turns a crank. If the air gap on the spark plug becomes too wide (usually caused by wear of the positive electrode) the electrical charge may not be able to jump the gap. When this happens there is no spark. When there is no spark, there is no explosion, and no downward pressure on the piston. This is called a misfire. A misfire will decrease performance and fuel economy, and if left unaddressed, may cause damage to the converter.
Solution: To replace it, it is unscrewed from the head. On some cars this is very easy, on others, access to the plug is obstructed.