1992 Volvo 240
Torque manifold nuts
A loose manifold could alter air/fuel ratio and cause an increase in emission and/or poor driveability.
Valves
The valve clearance should be checked every 30,000 miles (48,000 km).
Exhaust Gas Recirculation (EGR)
This system operates by returning some of the exhaust gases to the engine to be recombusted: since this lowers the combustion temperature the amount of nitrogen oxides released into the atmosphere is reduced.
The EGR valve should be inspected at the 60,000 mile (96,000 km) inspection and
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