Exhaust gas gas is undesirable, noxious, or toxic substances, such as carbon monoxide (CO) from incomplete combustion, hydrocarbons (properly indicated as CH, but typically shown simply as "HC" on emissions-test slips) from unburnt fuel, nitrogen oxides (NO) from excessive combustion temperatures, and particulate matter (mostly soot). Exhaust gas temperature (EGT) is important to the functioning of the catalytic converter of an internal combustion engine. It may be measured by an exhaust gas temperature gauge. EGT is also a measure of engine health in gas-turbine engines (see below). During the first two minutes after starting the engine of a car that has not
1965 24 Hours of Le Mans the previous year’s race when Mike Rothschild had been overcome by exhaust fumes. After seeing off the Fords, the Ferraris also started having problems. First to fall was the Maranello car. An exhaust broke and Bonnier, choking from the fumes, bought the car in from third to retire as night fell. The gearbox of Parkes/Guichet got jammed in fifth gear. During the night, all of the P2s got delayed by cracks in their brake discs, which in turn gave problems in suspension, each losing 30-60 minutes or more in getting the issues fixed. The Cobras had been running very well