Frontier SC King Cab 4WD V6-3.3L SC (VG33ER) (2001)
6. Push out any malfunctioning injector from injector fuel tube.
7. Replace or clean injector as necessary.
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Always replace O-rings with new ones.
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Lubricate O-rings with engine oil.
8. Install injector to injector fuel tube assembly.
9. Install injectors with fuel tube assembly to intake manifold.
Tighten in numerical order shown in the figure.
a. First, tighten all bolts to 4.9 to 6.0 N.m (0.5 to 0.61 kg-m, 3.6 to 4.4 ft-lb).
b. Then, tighten all bolts to 10.8 to 14.7 N.m (1.1 to 1.5 kg-m, 8 to 11 ft-lb).
10. Reinstall any part removed in reverse order of removal.
CAUTION: After properly connecting fuel hose to injector and fuel tube, check connection for fuel leakage.