ACDelco is the true General Motors Original Equipment parts brand, infusing a century of experience, innovation and quality into more than 90,000 GM OE and other parts.
Original Down To Our Blueprint
ACDelco parts appear in more than 2 million GM vehicles each year, which makes us the only GM parts brand to offer the same Original Equipment parts shipped for GM vehicle production.
A Professional Choice
ACDelco PROFESSIONAL parts are manufactured to meet expectations for fit, form and function, offering high quality and great value.
The ACDelco Advantage
Our ADVANTAGE parts provide a competitively priced, yet quality alternative to unbranded aftermarket components.
It's Our Specialty
ACDelco gold-label SPECIALTY parts are engineered to OE expectations for exceptional applications that require enhanced performance, including police vehicles.
ACDelco Spark Plugs
When it comes to replacing your spark and glow plugs, ACDelco offers a full line of Professional premium aftermarket and Specialty spark and glow plug products. Whether you are choosing from our Iridium, Double Platinum, RAPIDFIRE Single Platinum, Conventional, Glow Plug, Marine, or Outdoor Power Equipment lines, you will know that you are getting a century’s worth of experience and know-how packed into that plug. ACDelco Professional premium aftermarket and Specialty spark and glow plugs fit both GM and non-GM vehicles.
ACDelco Spark Plugs
ACDelco offers a 7 year/Unlimited Mile limited warranty on Spark Plugs.
Effective on parts purchased April 1, 2018, and later to the original retail purchaser. Contact seller for limited warranty part details, qualifications, and possible labor coverage.
ACDelco Spark Plugs
Visually inspect spark plugs for signs of wear. Follow these steps for removing spark plugs for inspection, servicing or replacement:
Grasp the spark plug boot and gently rotate it 90 degrees counterclockwise. Pull the spark plug boot and cable away from the spark plug. If necessary, use a spark plug boot removing tool. DO NOT grab or violently pull spark plug cables.
Brush or air blast dirt away from the well areas before removing spark plugs. CAUTION: Use goggles to protect eyes from debris when applying compressed air to spark plug wells.
Use the correct deep socket size to loosen each spark plug one or two turns. NOTE: To remove spark plugs from aluminum heads, allow the engine to cool. The heat of the engine, in combination with a spark plug that is still hot, may cause the spark plug threads to strip the cylinder head upon removal.
Remove each spark plug and place each one in a tray by cylinder number. This will help identify and relate any unusual condition to the cylinder involved.
Apply dielectric grease into the boot area to reduce the chance of exterior tracking on the buttress tower of the spark plug. This grease also promotes a good heat transfer between the spark terminal screw and boot terminal.
Before installing new spark plugs, use a gap guide to make sure your new spark plugs have the correct gap. NOTE: ACDelco Professional Iridium Spark Plugs are pre-gapped during manufacturing. Never attempt to gap an ACDelco Professional Iridium Spark Plug. You could damage the spark plug. Replace any incorrectly gapped ACDelco Professional Iridium Spark Plugs with plugs that are correctly gapped.
Install spark plugs or glow plugs to the proper torque per the manufacturers’ specification.
ACDelco Spark Plugs
Is there a recommended interval for changing my vehicle’s spark plugs?
Yes, this interval 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.
Should I change all of my vehicle’s spark plugs at the same time?
Yes, if it is the scheduled time for spark plug replacement. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected.
Does a diesel engine require a different type of plug than a gas engine?
Yes. Diesel engines require glow plugs because diesel engines operate differently than gas engines. ACDelco Professional Glow Plugs are specially designed to give diesel engines the heat they need for their cold starts. Refer to your owner’s manual or contact your vehicle’s manufacturer for more information.
Are ACDelco spark plugs pre-gapped?
Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
When I replace my spark plugs, should I also replace my spark plug wires?
Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. Refer to your vehicle owner’s manual or contact the manufacturer for more information.
What is pre-ignition and can it damage my engine?
Yes, pre-ignition can cause serious damage to your engine. Pre-ignition is the ignition of fuel before the actual spark occurs, which causes a rapid temperature rise in the combustion chamber that can damage engine components and melt spark plug electrodes. Causes of pre-ignition include but are not limited to a buildup of deposits that can become incandescent in the combustion chamber, improper installation torque being applied to spark plugs, and having spark plugs with a heat range that is too hot for the engine’s operating condition.
Can I just clean my spark plugs instead of replacing them?
No, cleaning your old spark plugs is not recommended. Dirty, fouled spark plugs may also have broken or 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.
Does ACDelco have marine spark plugs?
Yes, ACDelco has marine spark plugs for many applications.
ACDelco Professional Iridium Spark Plugs are the high quality replacement ideal for many vehicles on the road today. They are the latest in spark plug technology and an exact replacement for your vehicle’s original components. Iridium composition has the highest melting point and strength of all metals. It provides the greatest wear resistance and durability over Platinum and Conventional spark plugs. ACDelco Professional Iridium Spark Plugs provide the best wear resistance and durability of any spark plug. These premium aftermarket replacement iridium spark plugs are manufactured to meet your expectations for fit, form and function.
Features & details
Iridium offers better engine idle stability and smoother performance
Iridium allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration
Iridium fine-wire electrode helps improve ignition of the fuel and burns away carbon deposits on the tip of the plug as they form, to help improve fuel economy
One piece suppressor seal blocks radio frequencies that can affect vehicle electronics
Suppressor seal meters spark energy for longer electrode life and seals against combustion leakage