What is a spark plug gap, and why does it matter?

The spark plug gap is the distance between the center and side electrodes, where the spark jumps to ignite the fuel-air mixture in the combustion chamber. This gap is crucial because if it's too small or too large, the spark may not be strong enough or may not occur at the right time, causing poor engine performance, increased emissions, and reduced fuel efficiency.

How do I find the correct spark plug gap for my vehicle?

The correct spark plug gap for your vehicle can be found in the vehicle's owner manual or a repair manual for your specific model. Alternatively, this information can often be obtained from the spark plug manufacturer's website or customer service line.

How do I measure and adjust the spark plug gap?

To measure and adjust the spark plug gap, you'll need a spark plug gap gauge or feeler gauge. Slide the gauge between the electrodes at the tip of the plug and read the measurement. If the gap is too large or small, gently bend the side electrode until the correct gap is achieved. Be sure to handle the plug carefully to avoid damaging the electrodes.

Can the wrong spark plug gap cause the engine to misfire?

Yes, if the spark plug gap is too wide or too narrow, it can cause the spark to be too weak or not occur at the correct time, which can result in engine misfire. This can cause the engine to run rough, decrease fuel economy, increase emissions, and potentially cause damage over time.

Should I check the spark plug gap even on pre-gapped spark plugs?

Yes, even though spark plugs often come pre-gapped for a general range of models, it's essential to check and confirm the gap with a gauge. The gap can sometimes be altered during handling or shipping, and different engines may require slight adjustments for optimal performance.

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