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Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not drop below 241 KPa (35 psi). Does the pressure drop below the listed specification? Yes >> Replace the leaking fuel injector(s). Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 9 9. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure, even with the engine off. Before testing or ser- CAUTION: After each fuel injector actuation, start the engine to clear the cylinder of fuel. Failure to do so Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the fuel injector control for the cylinder where a misfire is detected. Monitor the fuel pressure gauge. Does the fuel pressure drop after the injector is actuated? Yes >> Go to 10 No >> Go to 11 NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing. 10. INTERNAL ENGINE COMPONENT Check for any of the following conditions/mechanical problems. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination CAM LOBES - must not be worn excessively CYLINDER LEAKAGE TEST - must be within specifications VALVE SPRINGS - must not be weak or broken Were any problems found? Yes >> Repair as necessary. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go to 17 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 255 |