Cuts Out, Misses

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Cuts Out, Misses

Inspections	Action
DEFINITION: A steady pulsation or jerking that follows engine speed, which is usually more pronounced as the engine load increases. This condition is not normally felt above 1,500 RPM or 48 km/h (30 mph). The exhaust has a steady spitting sound at idle or at low speed.
Preliminary	Refer to Important Preliminary Inspections Before Starting in Symptoms - Engine Controls . Search for bulletins. Inspect the engine control module (ECM) grounds for being clean, tight, and in the proper locations. Refer to Power and Grounding Component Views in Wiring Systems and Engine Controls Schematics . Inspect the intake air ducts for leaks and proper location. Remove the air filter element and inspect for dirt or for being restricted. Refer to Air Cleaner Element Replacement .
Fuel System	Test the fuel injectors. Refer to Fuel Injector Coil Test . Inspect the fuel system. Refer to Fuel System Diagnosis . Test for incorrect fuel pressure. Test for a restricted fuel filter. Test for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (w/ Special Tool) . Inspect the items which can cause an engine to run rich (long term fuel trim near -13 percent). For a rich condition, refer to DTC P0172 or P0175 . Inspect items that can cause an engine to run lean, long term fuel trim near 23 percent. For a lean condition, refer to DTC P0171 or P0174 .
Sensor/System	Monitor the knock sensor (KS) system for excessive spark retard activity with a scan tool. Refer to Scan Tool Data List . Inspect the CKP sensor for proper operation or intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Ignition System	Test for proper ignition system operation. Refer to Electronic Ignition (EI) System Diagnosis . Test for secondary ignition system leakage. Refer to Electronic Ignition (EI) System Diagnosis . Remove the spark plugs and inspect for the following conditions: Correct heat range Wet plugs Cracks Wear Improper gap Burned electrodes Heavy deposits Determine the cause of the fouling before replacing the spark plugs if the spark plugs are gas, coolant, or oil fouled. Refer to Spark Plug Inspection . Once you determine the cause of the fouling, refer to one of the following procedures: For diagnosis of the rich condition, refer to DTC P0172 or P0175 . For diagnosis of coolant contaminated spark plugs, refer to Loss of Coolant (M 35) or Loss of Coolant (M 82) in Engine Cooling. For diagnosis of oil fouled spark plugs, refer to Oil Consumption Diagnosis in Engine Mechanical.
Engine Mechanical	Inspect the following conditions: Low compression-Refer to Engine Compression Test in Engine Mechanical. Sticking or leaking valves Worn camshaft lobes-Refer to Camshaft and Bearings Cleaning and Inspection in Engine Mechanical. Camshaft timing-Refer to Timing Belt Timing Procedure in Engine Mechanical. Broken valve springs Excessive oil in combustion chamber-Leaking valve seals-Refer to Oil Consumption Diagnosis in Engine Mechanical. Inspect the following components for incorrect basic engine parts: Camshafts-Refer to Camshaft and Bearings Cleaning and Inspection in Engine Mechanical. Cylinder heads-Refer to Cylinder Head Cleaning and Inspection in Engine Mechanical. Pistons, connecting rods, or bearings-Refer to Piston, Connecting Rod, and Bearings Cleaning and Inspection in Engine Mechanical.
Additional	Inspect the following exhaust system components for possible restrictions: The exhaust system for physical damage The mufflers for heat distress or possible internal failure The catalytic converters for possible plugged pipes by comparing the exhaust system back pressure on each side of the engine-Refer to Restricted Exhaust in Engine Exhaust. Electromagnetic interference (EMI) on the CKP reference circuit can cause an engine miss condition. A sudden increase in RPM with little change in actual engine RPM indicates that EMI may be present. Inspect for high voltage components near the ignition control circuits if a condition exists. Inspect the intake manifold and the exhaust manifold passages for casting flash. Refer to: Intake Manifold Replacement in Engine Mechanical Exhaust Manifold Replacement - Left (LY7) , Exhaust Manifold Replacement - Left (LA3, LY9) or Exhaust Manifold Replacement - Left (LS6) in Engine Exhaust Exhaust Manifold Replacement - Right (LA3, LY9) , Exhaust Manifold Replacement - Right (LY7) or Exhaust Manifold Replacement - Right (LS6) in Engine Exhaust