How do you install new spark plugs on GMC?
How do you install new spark plugs on GMC? I put a little anti-sieze on the threads and a dab of dielectric grease on the coil pack boots before installing the new plugs. All of them had correct gap right out of the box. I spun the plugs in by hand, using only the extension, to avoid cross-threading. When do you need to change your spark plugs? If spark plugs are not checked with regular services, cleaned or changed when necessary, they can cause problems to occur with the vehicle’s engine. Below are six signs for when to change your...