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10.6 Summary
The EGR system is designed to reduce Nox production. Usually it works fine and
there is no need to adjust it. However, if it fails and starts providing excess exhaust
gas re-circulation then the engine produces excess smoke and becomes difficult to
drive, since idling and power are affected. Several possible causes and solutions
have been described. If the EGR system fails in the shut position, or is actively
disabled by blanking it off, then near-normal engine performance is restored,
although there is the risk, presumably slight, of deceasing engine life. Mitsubishi
recommend replacing rather than disabling a faulty EGR valve. In some countries it
is illegal to disable the valve.