If a spark plug is colder than necessary.
The Combustion chamber's temperature decreases (similar effect as a too Rich Mixture) and the drop of the temperature brings as a consequence that the Carbon Monoxide (CO) emissions and the Hydrocarbons that are not burnt (HC) increase dangerously, polluting the Environment.
If the sparkplug is hotter than necessary.
The Combustion Chamber's temperature increases (similar effect as a too Poor Mixture) and this increase of temperature, brings as a consequence that the emissions of Nitrogen Oxide (NOx) also increase dangerously, polluting the Environment.
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