Replace it if necessary.

Inner Tube Inspection
Spring Tension InspectionAir Intake Duct Assembly (US, CA and CAL Models)
Install the dampers [A] and seal [B] as shown in the figure.
Fit the holder [C] to the air intake ducts [D].
Projections [E] and Holes [F]
Grooves [G] and Ribs [H]
Tighten:
Torque - Air Intake Duct Assembly Screws [I]: 1.5 N·m (0.15
kgf·m, 13 in·lb)
Turn the plug [J] so that ...
Nozzle Assy Installation
Replace the dust seals [A] with new ones.
Apply engine oil to the new dust seals, and install them.
Install the nozzle assy securely.
Push the four mounting positions of the injectors.
Set the joint pipe parallel to the air cleaner housing [B].
NOTICE
When installing the nozzle assy, ap ...
Valve Clearance
Valve and valve seat wear decreases
valve clearance, upsetting valve timing.
NOTICE
If valve clearance is left unadjusted,
wear will eventually
cause the valves to remain
partly open; which lowers performance,
burns the valves and
valve seats, and may cause serious
engine damage.
Valve cle ...