What is the spark plug gap on a Ford Expedition?
What is the spark plug gap on a Ford Expedition? The proper gap for spark plugs is always listed on the underhood emissions label. The gap for 2v 4.6L and 5.4L engines is . 054 to . 056 inches. What's the gap size on a 1999 Ford Expedition? You will find the exact gap size for the 1999 Ford Expedition in your owner's manual. On the 4.6 litre V-8 engine, the gap size will be 0.059. Once you have set the gaps, install each spark plug in the engine block using your spark plug wrench. Don't over-tighten the plugs. Replace...