![]() The gap should be adjusted by only moving the ground electrode.Īnother consideration that should be taken into account is the extent of any modifications that you may have made to the engine. If adjusting the gap on fine wire or precious metal plugs such as platinum or iridium, be very careful not to apply any pressure or prying force to the fine wire center electrode or insulator as they can be damaged. It is always best to check the gap against the manufacturer’s specifications. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. Although the NGK factory will set the gap to a preselected setting, this may not be the right gap for your particular engine. A spark plug part number might fit hundreds of different engines from many different manufacturers. Replace your dirty, fouled spark plugs with new ACDelco spark plugs.DO I NEED TO SET THE “GAP” WHEN INSTALLING A NEW SET OF PLUGS? ![]() These conditions severely affect spark plug performance. Dirty, fouled spark plugs may also have broken or chipped insulator tips, worn electrodes, or worn or missing side wires. Q: Can I just clean my spark plugs instead of replacing them?Ī: No, cleaning your old spark plugs is not recommended. 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. 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. Q: What is pre-ignition and can it damage my engine?Ī: Yes, pre-ignition can cause serious damage to your engine. Refer to your vehicle owner’s manual or contact the manufacturer for more information. Q: When I replace my spark plugs, should I also replace my spark plug wires?Ī: Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification. Refer to your owner’s manual or contact your vehicle’s manufacturer for more information.Ī: Yes. ACDelco Professional Glow Plugs are specially designed to give diesel engines the heat they need for their cold starts. Diesel engines require glow plugs because diesel engines operate differently than gas engines. Q: Does a diesel engine require a different type of plug than a gas engine?Ī: Yes. 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. Q: Should I change all of my vehicle’s spark plugs at the same time?Ī: Yes, if it is the scheduled time for spark plug replacement. Refer to your owner’s manual or contact your vehicle’s manufacturer for more information. Q: Is there a recommended interval for changing my vehicle’s spark plugs?Ī: Yes, this interval depends on what type of spark plug your vehicle requires.
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