ISBe/ISB Series Engines – Engine Acceleration or Response Poor

Operator technique is notcorrect

Refer to the Operating Instructions in Section 1.

Fuel level is low in the tank

Fill the supply tank. Refer to the OEM service manual.

Fuel leak

Check the fuel lines, fuel connections, and fuel filters for leaks. Check the fuel lines to the supply tanks. Refer to the OEM service manual.

Electronic fault codes are active

For instructions on how to read active fault codes, refer to Diagnostic Fault Codes in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.

Fuel supply line restriction between the fuel pump and the injectors

Check the fuel supply line from the fuel pump to the cylinder head for sharp bends that can cause restrictions. Refer to an Authorized Cummins Repair Facility.

Charge air cooler is restricted or leaking

Inspect the charge air cooler for air restrictions or leaks. Refer to an Authorized Cummins Repair Facility.

Air intake or exhaust leaks

Check for loose or damaged piping connections and missing pipe plugs. Check the turbocharger and exhaust manifold mounting. Refer to Section 3.

Air intake system restriction is above specification

Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to Section 4.

Fuel grade is notcorrect for the application, or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Section V.

Clutch or torque converter is malfunctioning

Check the clutch and torque converter for correct operation. Refer to the OEM service manual.

Vehicle parasitics are excessive

Check the vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time, and engine-driven units. Refer to the OEM service manual.