In olden times, part of the ritual of changing your engine's spark plugs was making sure that the gap was set correctly for optimum performance. That is, the distance between the spark plug's center ...

A hot spark plug has a longer insulator tip and less insulator-to-shell contact area. Thus it absorbs more heat from the chamber, and transfers less to the cylinder head coolant.

How can you tell for sure if the spark plug isn’t firing? We’re going to talk about two tests you can perform to test out spark plugs. Both are relatively easy and require little more than ...

Bosch 9697 Double Iridium OE Replacement Spark Plug – $10.29 (18% off) $10.29 at Amazon. Key Features. Double iridium firing pin; 360 degrees continuous laser ...

Spark plug heat ranges should stay the same as at sea level unless racing above 3,000 feet, where one step hotter usually suffices. Test and Evaluate With a new or unknown combination, play it safe.

If you're doing some maintenance on your 5.7 HEMI, it's important to know the cylinder numbers and their firing order. Here's everything you need to know.

Where distributor caps and rotors once needed replacement, electronic ignitions typically keep on firing. In new vehicles, spark-plug replacement intervals are often around 100,000 miles.

Proper spark plug gap varies by vehicle, so you'll want to consult a service manual, ... On the other hand, too large of a gap can result in no firing at all — a misfire.