Inspection
| Action
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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.
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Preliminary Inspection
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| • | Compare the scan tool data at idle with the scan tool data list. Refer to
Scan Tool Data List
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Sensor Inspection
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| • | Observe the Actual Fuel Rail Pressure and the Desired Fuel Rail Pressure parameters. If the pressure difference is more than 2 MPa, a fuel control issue may exist. |
| • | 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. |
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Engine Mechanical Inspection
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| • | Inspect the engine for the following conditions: |
| • | Inspect the intake and exhaust manifold passages for casting flash. |
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Fuel System Inspection
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| • | Inspect the fuel system for a plugged fuel filter, high vacuum, air in the fuel system, etc. Refer to
Fuel System Diagnosis
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| • | 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
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