







A rough idle, hesitation during acceleration, or a slow rise in fuel consumption are all reasons to pull a spark plug and read the tip. A burnt spark plug is easy to identify once you know what to lo...
If you are about to install a new set of spark plugs, the single most useful tool you can add to the job is a properly rated torque wrench. The short answer, before we go any deeper: yes, you need on...
Iridium spark plugs are a practical upgrade, but not because they add horsepower. They deliver a longer service life, more stable firing, and a smaller center electrode that needs less voltage to pro...
If you are comparing a heat range 6 and a heat range 7 spark plug for the same engine, the direct answer is that the 6 is one step hotter and the 7 is one step colder. The 7 keeps the electrode tip r...