1. Locating the factory coil packs on your engine is the first step in installing the new S.O.S. coils. The coil packs are going to be found in the cylinder head under the fuel rail, assorted wire looms, and random hoses tucked away where some engineer never thought you would look for them. It is best to start with the most difficult-to-reach first, which will be the coil packs on the rear-most cylinders.