Software update, when engine is cold the PCM receives information from the temperature sensor and advances engine timing until engine warms up, unfortunately advanced timing affects NOx emissions and manufacturers are concerned with reduce NOx. Check timing and temperature on live data and compare best with worst. Usually with advanced timing engine sounds noisier when cold. |
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Vauxhall Combo A13FD 2015 - Smoking # - andrew pethig March 26, 2020, 11:53 am
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