Toyota TERCEL 1985 Repair Manual page 178

FU-28
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MAS Plug
Drill
MAS Plug
FUEL SYSTEM - Carburetor
IDLE MIXTURE
ADJUSTMENT OF IDLE MIXTURE
1.
2.
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FU0094
FU0095
FU0096
NOTE:
• To conform with regulations, the idle mixture adjusting
screw is adjusted and plugged with a steel plug by
manufacturer. Normally, this plug should not be
removed.
• When troubleshooting rough idle, check all other possi-
ble causes before attempting to adjust the idle mixture
(see TROUBLESHOOTING on page FU-2). Only if no
other factors are found to be at fault, should the idle
mixture be adjusted and, when doing so, remove the
plug and follow the procedure described below.
REMOVE CARBURETOR (See page FU-7)
REMOVE MIXTURE ADJUSTING SCREW PLUG
(MAS PLUG)
(a) Plug each carburetor vacuum port to prevent entry of
steel particles when drilling.
(b) Mark the center of the plug with a punch.
(c) Drill a 6.5 mm < / > (0.256 in. <f>) hole in the center of the
plug.
NOTE:
• As there is only 1 mm (0.04 in.) ciearance between the
plug and screw, drill carefully and slowly to avoid drill-
ing onto the screw.
• The drill may forcé the plug off at this time.
(d) Through the hole in the plug, fully screw in the mix-
ture adjusting screw with a screwdriver.
NOTE: Be careful not to damage the screw tip by
tightening the screw too tight.