Co-Authored By:
The fine tip iridium are always pre-gapped at factory and the manufacturers specifically say that should NOT be messed with by user. The Motorcraft ones are cheap versions of Autolite Dual Platinum, they requested "no factory gapping" to their OEM (Autolite) to save costs, that's why the gap is never exact.
Thereof, are Motorcraft spark plugs gapped?
I called the vendor I bought them from, Motorcraft and a parts store, and they all said they are pre-gapped platinum spark plugs and not to try and re-gap them. They said re-gaping a platinum spark plug can damage the platinum coating, hence the reason they are sold pre-gapped.
In this regard, are pre gapped spark plugs good?
Autolite spark plugs traditionally leave the factory pre-gapped for their most popular application. However, a plug may fit hundreds of engines, from cars to golf carts. Gapping the plugs to your engine's specifications is important to prevent pre-ignition, detonation, fouling and poor fuel economy.
A: Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification. A: Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. Refer to your vehicle owner's manual or contact the manufacturer for more information.