90S Quattro (Canada) V6-2.8L (AAH) (1993)
Fuel Injector: Testing and Inspection
Fuel Leakage and Quantity
FUEL INJECTOR LEAKAGE
REQUIREMENTS
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System fuel pressure OK.
PROCEDURE
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Remove intake air duct between Mass Air Flow (MAF) sensor and engine cover.
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Disconnect and lay aside ignition cables to permit removal of fuel rail.
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Disconnect harness connectors from fuel injectors.
Fuel Rail Mounting
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Disconnect fuel rail from intake manifold.
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Disconnect vacuum hose from fuel pressure regulator.
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Lift fuel rail with fuel injectors off intake manifold and support.
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Use On-Board Diagnostics (OBD) output diagnostic test mode to activate fuel pump relay -J17-. See: Computers and Control Systems/Testing
and Inspection
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Fuel pump should run
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Visually check fuel injectors for leaks.
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With fuel pump running, no more than 1 to 2 drops of fuel per minute may be discharged from each fuel injector.
If fuel leakage is greater:
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Switch ignition off and replace leaking fuel injector and seals.
FUEL INJECTION DELIVERY RATE
Injector Spray Test
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Place fuel injector to be tested in measuring beaker.