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1993 Volvo 240
Engine Ignition
Change spark plugs
The spark plugs should be changed every 30,000 miles (48,000 km).
However, prolonged city driving or fast highway driving may necessitate changing spark plugs after
15,000 miles (24,000 km) of driving. When installing new plugs, be sure to fit the right type and use the
correct torque, see "Specifications".
When changing the spark plugs, check that the suppressor connectors are in good condition. Cracked or
damaged connectors should be replaced.
When changing spark plugs, clean the cables and cable terminals, also the rubber seals.
CAUTION: Do not use silicone-based lubricants, which can have adverse effects on electrical
components.
WARNING!
The ignition system operates at very high voltages. Special safety precautions must be followed to
prevent injury:
Always turn the ignition off when:
●
connecting engine test and diagnostic equipment to the vehicle (timing light, tach-dwell tester,
ignition oscilloscope, etc.)
●
Replacing ignition components e.g. plugs, coil, distributor, high-tension leads etc.
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