Spark plugs have a precious metal that looks like a nipple. A spark jumps between that tip and a ground electrode overhead to ignite the air/fuel mixture. You want a strong spark to make as much...

Spark plugs are pre-gapped. Therefore, you can install them and run the vehicle immediately without making additional changes. But is that true for everyone? Do manufacturers pre-gap their spark...

Spark plugs are responsible for igniting the air/fuel mixture. In other words, an engine with bad spark plugs won’t work. These components use a spark that jumps between two electrodes as the...

RPM stands for ‘Revolutions Per Minute,’ and it spikes when you rev the engine. People expect the speed to increase with the RPM. A revving engine in a vehicle rolling downhill doesn’t concern...

What happens when you step on the throttle? The speed and RPM will increase simultaneously. You can tell by looking at the tachometer and speedometer. These two variables go hand in hand. When you...

You rev the engine by shifting the gear to ‘Neutral’ or ‘Park’ and stepping on the accelerator. The car won’t move, but the RPM will spike. People rev their cars in the morning all the...