Malfunction | Cause/Remedy |
Air filter dirty, fuel system leaking | Clean or replace filter element. Inspect all fuel lines (suction, return, injection), fuel filter and pump |
Return line clogged | Blow air through the return line from the fuel pump to the fuel side |
Too high idle speed or maximum speed | Check and adjust idle speed and maximum speed |
Faulty injectors | Nozzle leaking or dirty, loose or broken nozzle needle. Incorrect injection pressure. Defective or loose protective thermal pad under nozzle |
Start of fuel supply not adjusted | adjust |
Faulty fuel pump | Try installing a new pump |
Engine has mechanical problems | Valves leaking. Worn cylinders/piston, loose cylinder head gasket. Narrowing in the exhaust system. Check compression |
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