DeVille DHS V8-4.6L VIN Y (2000)
power, surging, and misfiring.
NOTE: Refer to Fuel Pressure at 414 kPa Notice in Service Precautions.
16. Restricting the fuel return pipe with the J 37287 fuel pipe shut-off adapter causes the fuel pressure to rise above the regulated fuel pressure. Using
a scan tool to pressurize the system, the fuel pressure should rise above 376 kPa (47 psi) as the valve on the fuel pipe shut-off adapter connected
to the fuel return pipe becomes partially closed.
22. Check the spark plug associated with a particular fuel injector for fouling or saturation in order to determine if that particular fuel injector is
leaking. If checking the spark plug associated with a particular fuel injector for fouling or saturation does not determine that a particular fuel
injector is leaking, use the following procedure.
1. Remove the fuel rail, but leave the fuel pipes connected to the fuel rail. Refer to Fuel Rail Assembly Replacement.
2. Lift the fuel rail just enough to leave the fuel injector nozzles in the fuel injector ports.
CAUTION: In order to reduce the risk of fire and personal injury that may result from fuel spraying on the engine, verify that the fuel rail
is positioned over the fuel injector ports. Also verify that the fuel injector retaining clips are intact.
3. Pressurize the fuel system by using a scan tool.
4. Visually and physically inspect the fuel injector nozzles for leaks.
