TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 ENGINE LOW IDLE ABNORMAL OPERATION 0009 00 MALFUNCTION 1: (Continued) Low idle speed, below 650 rpm. PROBABLE CAUSE CORRECTIVE ACTION c. (Continued) One bank not firing. (2) Check inlet filter (watchdog) on fuel injection pump (TM9-2910-212-34 & P). MALFUNCTION 2: Low-idle speed erratic (unsteady or surge). PROBABLE CAUSE CORRECTIVE ACTION a. Idle speed too low. (1) Adjust idle speed (WP 0043, Throttle Adjustments). b. Accelerator or throttle linkage loose, worn, or cross-shaft shock spring defective. (1) Inspect linkage (WP 0122, Throttle Control and Manual Fuel Shutoff Replace/Repair). (WP 0123 for 2DR) c. One or more cylinders partially firing. (Water or air in fuel system). (1) Refer to WP 0020, Fuel System Abnormal Conditions. d. Injector nozzles defective. (1) Remove and check nozzles (WP 0114, Fuel Injector Nozzle Replace/Repair). e. Fuel-injection pump governor defective. (1) Replace defective fuel-injection pump (WP 0115, Fuel Injection Pump Assembly Replacement). f. Fuel injection-pump improperly timed. (1) Check timing (WP 0036, Injection Pump Timing). MALFUNCTION 3: Misfires at idle (usually accompanied by white exhaust smoke, oily or heavy carbon deposits on exhaust grilles). PROBABLE CAUSE CORRECTIVE ACTION a. Engine operating at idle for extended period during cold weather. (1) Increase engine idle speed to 1000 - 1200 rpm. END OF WORK PACKAGE WP 0009 00-2