Mitsubishi 1992 3000GT, Service Manual

Page: 50 / 1308

GENERAL
Maintenance Service
Correct
4. EVAPORATIVE EMISSION CONTROL
SYSTEM (Check for leaks and clogging)
except evaporative emission canister
.
1. If the fuel-vapor vent line is clogged or damaged, a fuel
vapor mixture escapes into the atmosphere causing ex-
cessive emissions. Disconnect the line at both ends, and
blow it clean with compressed air. Remove the fuel tank
filler tube cap from the fuel tank filler tube and check
to see if there is evidence that the packing makes improper
contact to the fuel tank filler tube.
2. The fuel tank pressure control valve installed on the vapor
line should be checked for correct operation.
5. SPARK PLUGS (Replace)
The spark plugs must fire properly to assure proper engine
performance and emission-control.
Therefore, they should be replaced periodically with new ones.
Spark plug
NGK
NIPPON DENS0
Spark plug gap: 1.0-1.1 mm in.)
NOTE
For the platinum plug, use care not to damage the platinum
tip.
Do not try to adjust the plug gap.
Specified torque: 25 Nm (15
6. IGNITION CABLES (Replace)
The ignition cables should be replaced periodically with new
ones.
After replacing, make sure that the ignition cables and termi-
nals are properly connected and full seated.
NOTE
When disconnecting an ignition cable, be sure to hold cable
cap. If the cable is disconnected by pulling on the cable
alone, an open circuit might result.
7. TIMING BELT (Replace)
Replace the belt with a new one periodically to assure proper
engine performance.
For removal and installation procedures, refer to GROUP
11
Timing Belt.
TSB Revision