Spark plugs that are not gapped properly will cause the engine to either skip firing, or ignite too soon in the compression stroke. Properly gapped spark plugs also remove heat from the cylinder ignition chamber. The heat range of a spark plug is defined as its ability dissipate heat from the tip.”Click to see full answer. Considering this, what happens if you don’t gap spark plugs correctly?Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion; both of which can cause an engine to miss or idle erratically.Subsequently, question is, do spark plug gaps increase over time? it is true though that a wider gap provides a larger flame front for more complete combustion but only to the point of blowout, this gap is usually reduced from factory for increased plug life, since lots of life will be spent at low speed driving and like you said the gap widens over time so the gap is set at factory Thereof, do new spark plugs need gaps? The gap between the center and side electrodes of a spark plug must be an exact distance; otherwise, your plugs don’t fire efficiently. Gap new as well as old spark plugs, even if the package says that the new plugs are “pre-gapped.” To avoid problems, work on only one plug at a time, in cylinder sequence order.Can improperly gapped spark plugs cause misfires?Excessive spark plug gap results when the voltage has too far to travel. Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle.

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