Emissions control
Exhaust species, injection strategies and aftertreatment for petrol and diesel engines.
Recently updated
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Particulate filter faults
How diesel and petrol particulate filters load with soot and ash, why short journeys and aborted regenerations block a diesel filter, and what to check before a workshop regeneration.
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EGR faults
How EGR valves, vacuum controls, passages and coolers fail on diesel and petrol engines, how the symptoms differ, and how to separate a stuck valve from a head-gasket-like cooler leak.
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Petrol and diesel emissions
How petrol and diesel engines form carbon monoxide, hydrocarbons, NOx and particulates, how carburettors, port injection, direct injection and common-rail post-injection change them, and how catalysts, EGR, secondary air and particulate filters treat them.