Troubleshooting table for too much fuel consumption
Before checking, you must make sure that serial tires are installed, the wheels rotate freely (check brakes and bearings), run-in completed (about 5000 km).
Malfunction | Cause and remedy |
Air filter dirty | Clean or replace filter insert |
Leaks in the fuel system. | Perform a visual inspection of all fuel lines, fuel filter and fuel pump. |
Clogged fuel outlet line. | Blow out the outlet pipe from the fuel pump to the fuel tank. |
Idle speed or maximum speed is too high. | Check and adjust idle speed and maximum speed. |
Faulty injectors. | Nozzles are leaking, dirty, nozzle needles are broken. Incorrect injection pressure. Loose thermal insulation under the nozzles. |
Incorrect feed start adjustment. | Check the feed start setting. |
Faulty fuel pump | Install a new pump to test. |
Mechanical malfunctions of the engine. | Incorrect valve clearance, loose valves, worn cylinders and pistons, loose cylinder head gasket. Narrowing in the exhaust system. Check valve clearance and compression. |
In addition to those given for a turbodiesel, the following causes of malfunctions are important:
Loose parts of the gas turbocharger. | Loose air hose between supercharger and suction pipe or between suction pipe and fuel pump. - Leaks between suction pipe and cylinder head. Loose suction pipe flanges. Weak relief valve clamp or loose O-ring. Leaks between exhaust outlet and cylinder head or supercharger |
Faulty blower. | Check boost pressure (In workshop). If it is too high and the control line to the control valve is good, replace the blower as Supercharger control valve defective. If the boost pressure is too low, then the relief valve is faulty. |
Relief valve defective. | Remove and plug the hose from the relief valve. Repeat boost pressure test. The pressure should drop by about 0.05 bar. If the pressure does not decrease or increase, replace the fuel pump. |
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