Engine faults

Minor and Major Engine systems faults The following lists some of the possible combinations of exhaust gas values and the most likely causes.
CO	CO2	HC	O2	A/F Ratio : possible problems, conditions or causes
Low to Moderate	Low	Low to Moderate	Low	Major Engine Faults: Compression Low, Camshaft lobe lift insufficient
Low to Moderate	Low	Low to Moderate	Low	Minor Engine Faults: Ignition Timing over advanced Spark Plug/s wire/s grounded or open ECM trying to compensate for a vacuum leak
Low	High	Low	High	Injector misfire, catalytic converter operating correctly
High	Low	High	Low	Thermostat or coolant temperature sensor faulty - "cold running engine"
Low	High	Low	Low	Thermostat or coolant temperature sensor faulty - "hot running engine"
Low	Low	Low	High	Exhaust leak after the catalytic converter
High	High	High	High	Combination of rich mixture and vacuum leak, Injector misfire, Cat. converter not working.
Low	High	Low	Low	Good combustion efficiency and catalytic converter working properly!

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