A8 Sedan V8-3.7L (AEW) (1997)
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Remove intake air duct between air cleaner housing and throttle valve.
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Remove engine cover.
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Remove accelerator pedal cable at bracket.
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Remove ball joint at connecting linkage for cruise control.
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Move accelerator pedal cable over cruise control vacuum unit toward rear.
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Disconnect vacuum hose for cruise control vacuum unit.
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Disconnect vacuum hose from fuel pressure regulator.
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Disconnect harness connector for engine coolant temperature sensor (blue connector).
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Disconnect harness connectors for knock sensors.
Remove cable ties or retaining straps as necessary.
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Disconnect connector for intake manifold change~overvalve.
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Disconnect harness connectors for fuel injector air valve.
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Disconnect harness connectors from fuel injectors.
Remove cable ties or retaining straps as necessary.
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Remove fuel rail from intake manifold and lift off together with fuel injectors.
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Disconnect hose from air valve for fuel injectors.
INSTALLING:
Installation of the fuel rail and the fuel injectors is the reverse of removal. Also observe to following special points:
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Replace all O-rings at all connections that have been opened. (To replace the front O-ring, do not remove the plastic cap from the valve head. Slip
the O-ring over the plastic cap).
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Lubricate O-rings with clean engine oil.
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Install fuel injectors upright to stop (open connectors must face outward) and secure injectors with retaining clips.
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Place fuel rail with installed fuel injectors into position at intake manifold and press in to stop.
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Insert bolts by hand. Lightly push fuel rail by hand toward intake manifold and tighten bolts to 10 Nm (7 ft lb.).
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Check fuel injectors for correct installation position (open electrical connectors face outward).
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Check to see that fuel injector retaining clamps are properly seated.