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6E-318 Engine Control System (4HK1) Surges / Chuggles Exhaust System Checks Inspect the exhaust system for a possible restriction. Refer to the Exhaust System • Inspect the exhaust brake valve for a stuck closed position. Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Engine • Inspect for poor cylinder compression. Proper compression is more than 1960 kPa (284 psi) and variation of each cylinder is less than 294 kPa (43 psi). • Improper valve timing Additional Checks • Inspect the generator output voltage. miss condition. The Tech 2 can usually detect EMI by monitoring the engine speed. Checks Action DEFINITION: The engine has a power variation under a steady throttle or cruise. The vehicle seems to speed up and slow Preliminary Checks • Diagnostic System Check – Engine Controls. matches the vehicle speedometer. • Inspect the engine control module (ECM) grounds for being clean, tight, and in their proper locations. • Inspect that the harness connectors are correctly connected. Checks Action |