How Often To Change Spark Plugs

Spark plugs typically last between 30,000-90,000 miles before they need to be changed. This estimated lifespan can differ based on exact make and model of the vehicle. Some vehicles, however, will only need to change spark plugs every 120,000 miles.

What Do Spark Plugs Do?

Spark plugs are designed to create a quick electrical arc, igniting the mixture of air and fuel inside the engine’s combustion chamber. This burst of energy will force the pistons to move.

The crankshaft transforms the movement into rotation of the wheels, ultimately propelling the vehicle forward. Diesel engines do not feature spark plugs because they rely on greater compression ratios to create the combustion.

How Often To Change Spark Plugs In Car

As mentioned above, most vehicles will call for spark plug changes between 30,000-90,000 miles. Some vehicles can go up to 120,000 miles before replacements are needed. Always reference your owner’s manual to know exactly when your spark plugs need to be changed.

Reasons For Bad Spark Plugs

The primary reason for failing spark plugs is time. The anti-corrosion coating responsible for protecting this component will eventually wear out. Oil, dirt, and carbon can all reach and build up on the spark plugs.

A bad fuel filter can also result in failing spark plugs. The resulting grime can accumulate on the spark plugs and erode the insulators, which forces electrical spark throughout the engine instead of in the location it is needed. Misfiring can eventually impact the overall performance of your engine.

When To Change Your Spark Plugs

The frequency of spark plug replacements will depend on the type and maintenance needs. Automakers recommend replacing these plugs every 30,000-40,000 miles. Platinum-tipped spark plugs should be replaced every 60,000 miles, while iridium plugs need to be replaced between every 100,000-120,000 miles.

Let’s take a look at a few signs of worn-out spark plugs, prompting the need for replacements.

Hard To Start Vehicle

The spark clause could be the issue when a vehicle is struggling to start up. Even with a good battery, your engine will have to work harder to make up for weak plugs. In some cases, the vehicle will not start up because the plugs don’t generate enough spark to turn the engine over.

Slow Acceleration

The vehicle fails to respond to the throttle when accelerating or struggles to pick up speed. This is the time to inspect the spark plugs.

Rough Idling

The engine emits a knocking and rattling sound when idling or loud noises emanate from the engine due to the added strain on your engine cylinders.

Less Efficient

Since there is no effective fuel or air mixture combustion, the engine will suck more fuel into the combustion chamber. This will make the vehicle run correctly, which results in poor fuel economy.

Engine Misfires

Overworked spark plugs often lead to engine misfires. Misfires can lead to the transfer of raw fuel into the exhaust due to incomplete combustion, which is a source of catalytic converter issues.

Transmission Service, Repair, & Replacement Services in Phoenix, AZ

We offer a full range of auto transmission repair and replacement services from automatic transmission to manual transmission to the entire Phoenix Metro area.

*Disclaimer – This is not an actual quote. Your transmission repair or replacement cost could be different than the prices you see on this guide. The only way to get an actual estimate is by searching for transmission repair and replacement shops near you. Contact Automatic Transmission Exchange if you are in the Phoenix area and need transmission repair or replacement.