ACDelco Conventional Spark Plug

ACDelco stands for quality. Get the performance you need with ACDelco products. The high-quality copper core and outstanding suppression characteristics of conventional spark plugs deliver reliable performance. ACDelco products are developed to exceed your performance expectations and deliver the durability you expect.

Black Onyx coating helps prevent corrosion

Copper core, the thermal properties of copper provide great heat transfer and increases plug durability

Ribbed suppressor seal, which extends resistance and prevents spark “flash over” and misfire

Nickel-chrome alloy sheathing to help prevent corrosion on center electrode

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 spark plug boot removing tool. DO NOT grab or violently pull spark plug cables.

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.

Brush or air blast dirt away from the well areas before removing spark plugs. CAUTION: Use goggles to protect eyes from dirt when applying compressed air to spark plug wells.

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 Iridium Spark Plugs are pre-gapped during manufacturing. Never attempt to gap an ACDelco Iridium Spark Plug. You could damage the spark plug. Replace the incorrectly gapped ACDelco Iridium Spark Plug with one that is correctly gapped.