Best Spark Plug Gap Tools: Properly Adjust Your Spark Plug Gap

Een if your car does start, bad spark plugs will produce problems long after. Ideally speaking, the sound of your engine should be smooth during idling, and your car shouldn’t be rattling. However, bad spark plugs will produce a rough and jittery idle. 3) Your engine will sometimes misfire.

In short, yes, in some situations spark plugs can increase horsepower. The theory behind spark plugs increasing horsepower is that by providing more spark to the firing tip of the spark plug, it will (and does) combust more fuel. …

• OEMTOOLS Blade Master. A high-quality feeler gauge with several blades that helps with measuring and adjusting the gap size.
• CTA Tools Spark Plug Gapper. A ramp-type spark plug gap measuring tool with an easy-to-read scale.
• CTA Tools Spark Plug Gap Gauge.

You need a feeler gauge to gap your spark plugs properly. Gap new as well as old spark plugs, even if the package says that the new plugs are “pre-gapped.” To avoid problems, work on only one plug at a time, in cylinder sequence order.

Tighten the spark plug finger-tight until the gasket reaches the cylinder head, then tighten about ½ – ⅔ turn more with a spark plug wrench. (Taper seat: About 1/16 turn more.)

• A useful tool that you could use for the gapping of your spark plug is the wire-type gap gauge which can be substituted by a feeler gauge. This will do the trick of measuring the gap on the spark plug.
• Spark plug gauge gap tool might also do the trick.

Most measuring tools will also feature a flat edge typically used for bending the bottom electrode on the spark plug to adjust the gap slightly. A coin-style gap measure is usually the cheapest option, and works by running the edge of the “coin” through the gap until you reach a point where it stops.