With coverage for the majority of older vehicles on the road today, ACDelco Professional Conventional Spark Plugs are premium aftermarket replacement plugs designed for reliability and efficient performance. The high-quality copper core and outstanding suppression characteristics deliver reliable performance. ACDelco Professional Conventional Spark Plugs are also available for marine applications. These premium aftermarket replacement conventional spark plugs are manufactured to meet or exceed your expectations for fit, form, and function.
Find out more about the ACDelco Professional Conventional Spark Plugs and how they fit into the starting and charging system with the product facts below.
Uses a high-voltage spark from the ignition coil to ignite the air/fuel mixture inside the engine cylinders.
Signs that your spark plugs need to be replaced:
The Starting and Charging System starts the engine, maintains the battery charge, and provides power to the electrical accessories while the engine is running.
It is important to inspect spark plugs at regular intervals for signs of deterioration. Follow these steps for removing spark plugs for inspection, servicing or replacement:
No, it depends on what type of spark plug your vehicle requires. Refer to your Owner’s Manual or contact your vehicle’s manufacturer for more information.
Yes, but spark plugs may not be the only factor impacting performance. Replacing old spark plugs may temporarily improve poor engine performance thanks to reduced demand on the ignition system. However, this is not the cure for poor engine performance caused by worn rings, faulty carburetion, worn distributor parts, or other engine performance issues.
Yes, if it is the scheduled time for spark plug replacement. It may be OK to replace one spark plug if it was broken for any reason prior to scheduled maintenance.
Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
Not always. Refer to your vehicle Owner’s Manual or contact the manufacturer for more information.
Certain engine conditions can cause oil, powder, and carbon to collect on the spark plug, causing a misfire. See the list of Signs and Causes of Spark Plug Wear.
Yes, pre-ignition can cause serious damage to your engine. Pre-ignition happens when the spark plug is too hot and fires before the piston is in the correct position.
No, cleaning your old spark plugs is not recommended. Dirty, fouled spark plugs may also have broken, chipped insulator tips, worn electrodes, or worn or missing side wires. These conditions severely affect spark plug performance. Replace your dirty, fouled spark plugs with new ACDelco spark plugs.
Yes, ACDelco has marine spark plugs for many applications.