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. …

1. Remove the HT leads from their housing on the spark plugs.
2. Use the 5/8 socket head to remove the old spark plugs from within the engine.
3. Once out, measure the distance between the points of the spark plug.
4. Before putting the new spark plugs into place, add some anti-seize or copper grease to the threads of them.

To keep your Honda vehicle’s ignition system working its best, experts recommend changing your spark plugs about every 30,000 miles.

The Honda Civic maintenance schedule recommends regular service every time your vehicle hits 7,500 miles.

Brush off the plug and firing tip with a clean rag. Spray the firing end with a quick-dry cleaner such as fuel injector cleaner or brake cleaner. Blow off the plug and firing end with an air compressor or can of compressed. Re-gap to your vehicles specifications.

Should you clean your spark plugs? While there is a way to clean spark plugs, experts say that you should avoid it if you can. Replacing them is almost always safer than attempting to clean them.

Using WD-40 to repel water from spark plugs, distributors, alternators, and batteries is a good way to prevent corrosion and keep moisture away. You can also use it to ease the removal of spark plugs, especially if there is any rust or corrosion.

Iridium Power Gapping Tips In most cases your Iridium Power plugs do not need to be gapped. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.

Iridium is said to be six times harder and eight times stronger than platinum. This means that spark plugs can have even finer electrodes than ever before and still have excellent wear characteristics. It is also worth mentioning, that with platinum and iridium plugs you generally get what you pay for. …

Conventional spark plugs should be replaced every 20,000-50,000 miles. Iridium or platinum-tipped spark plugs – also called “long life spark plugs” should be changed 60,000 and 150,000 miles, depending on the owner’s vehicle.