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Shutting down the EGR valve. well i've done it. it works , but maybe not on cold days. the heat may help. with faster warmup if nothing else. the erg and a lesser ignition advance is how nox is cut. the lower combustion heat cuts nox by heating the nitrogen in the are less. that was the big reason cars sold in America got less power and mpg than where they were made. a ford made in England was sold with a 1100 cc motor. here it first used a 1400 cc. motor. (i think)
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