Years of experience creating specialized sensors, connectors and other car engine components have helped earn NGK a reputation as a trusted brand noted for quality and consistency.

With over 8 decades of experience, NGK is one of the biggest names in spark plugs. What is the factory gap for NGK spark plugs? Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency. The larger the gap, the more voltage is needed to jump the gap. Excessive spark plug gap also happens as result of normal electrode wear and age. … Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. What happens if your spark plug gap is too big?Įxcessive spark plug gap results when the voltage has too far to travel. … NGK also recommends adjusting the gap no more than +/- 0.008” from the factory preset gap. Care must be taken to avoid bending or breaking off the fine-wire electrodes. While most NGK spark plugs are pre-gapped, there are occasions when the gap requires adjustment. … Other issues that may cause this type of shaking or vibration might be broken engine mounts or potentially tires that are out of balance or worn improperly. Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Why does my car shake after I changed the spark plugs? Factors such as the type of ignition you run, cylinder heads, fuel and even timing can affect how much gap will work best for you. Most engine builders seem to settle around 0.035 of an inch. …įor most racing applications, you usually want the plug gap to be between 0.020 and 0.040 of an inch. An engine that has a rough, irregular engine idle is often due to spark plugs that are incorrectly gapped. What are symptoms of improperly gapped spark plugs?Ī list of some of the most common symptoms of incorrectly gapped spark plugs is laid out below.

The air/fuel mixture then may not ignite or ignite on the wrong stroke, which can cause misfires. Q: What Happens If You Don’t Gap Spark Plugs? A: Ungapped spark plugs will cause misfires as the gap between the electrodes could be too small or too wide. What happens if spark plugs are not gapped? … It is always best to check the gap against the manufacturer’s specifications. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear.

Improperly gapped spark plugs