Cuts Out, Misses

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Cuts Out, Misses

Inspection	Action
DEFINITION: A constant jerking that follows the engine speed, usually more pronounced as the engine load increases which is not normally felt above 1,500 RPM or 48 km/h (30 mph). The exhaust has a steady spitting sound at idle, low speed, or hard acceleration for the fuel starvation that can cause the engine to cut-out.
Preliminary Inspection	Refer to Symptoms - Engine Controls . Compare the scan tool data at idle with the scan tool data list. Refer to Scan Tool Data List (Engine Control Module) or Scan Tool Data List (Glow Plug Control Module) .
Sensor Inspection	Observe the fuel rail pressure (FRP) sensor and the fuel pressure regulator commanded percent at idle. The FRP should be near 40 MPa, and commanded percent should be near 40 percent. If the command is high, a fuel pressure or sensor issue exists. Inspect for an intermittent crankshaft position (CKP) sensor signal. Refer to Testing for Intermittent Conditions and Poor Connections . Inspect the CKP sensor reluctor wheel. Remove the CKP sensor and attempt to move the reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose.
Engine Mechanical Inspection	Perform the Engine Compression Test. Refer to Engine Compression Test . Inspect the engine for the following conditions: Improper valve timing Bent pushrods Worn rocker arms Worn camshaft lobes Broken or weak valve springs-Refer to Symptoms - Engine Mechanical . Inspect the intake and exhaust manifold passages for casting flash.
Fuel System Inspection	Inspect the fuel system for a plugged fuel filter, high vacuum, air in the fuel system, etc. Refer to Fuel System Diagnosis . If the engine control module (ECM) glow plug control module (GPCM) or a fuel injector has recently been replaced, it may be necessary to confirm the fuel injector flow rate values. Refer to Fuel Injector Flow Rate Programming . Inspect for water contamination in the fuel. Refer to Contaminants-in-Fuel Diagnosis . Inspect the fuel injectors for proper operation. Refer to Fuel Injector Balance Test with Tech 2 (Manual Transmission) or Fuel Injector Balance Test with Tech 2 (Automatic Transmission) .