Aurora V8-4.0L VIN C (1996)
exhaust.
12. This test determines if the high fuel pressure is due to a restricted fuel return pipe or if the high fuel pressure is due to a faulty fuel pressure
regulator.
15. A lean condition may result from the fuel pressure being below 333 kPa (48 psi). A lean condition may cause a DTC P0131 or a DTC P0171 to
set. Driveability conditions associated with lean conditions can include hard starting (when the engine is cold), hesitation, poor driveability, lack of
power, surging, and misfiring.
Caution: Do not let the fuel pressure exceed 414 kPa (60 psi), as damage to the fuel pressure regulator may result.
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 (55 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:
