Honda Civic Sedan 1993 Owner's Manual page 134

Fuel Filter, Spark Plugs
Fuel Filter
The fuel filter should be replaced
every 4 years or 96,000 km (60,000
miles), whichever comes first.
Have a qualified technician change
the fuel filter. Since the fuel system
is under pressure, gasoline can
spray out and create a hazard if all
fuel line connections are not han-
dled correctly.
The filter may require replacement
sooner if you happen to buy one or
more tankfuls of contaminated
gasoline. Have the filter tested or
replaced if you suspect it has been
clogged by contaminants.
Maintenance
Spark Plugs
The original spark plugs in your
car need to be replaced every 2
years or 48,000 km (30,000 miles),
whichever comes first.
Replacement
SPARK PLUG CAP
1. Clean up any dirt and oil that
have collected around the spark
plug caps.
2. Remove the spark plug cap by
pulling it straight out.
3. Remove the spark plug, using a
16 mm (5/8 inch) spark plug
socket.