ACDelco 41-993 Professional Iridium Spark Plug (Pack of 4)
- 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. Before installing new spark plugs, use a gap guide to make sure your new spark plugs have the correct gap.