MTU Onsite Energy
Incomplete Combustion / Unburned Fuel
Excessive white smoke from exhaust during startup and light load
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Low cylinder compression, Cold engine and low coolant temperature, Faulty injector nozzle, Incorrect fuel grade
How to Fix / Troubleshooting
Safety first: Operate in a well-ventilated area. Avoid inhaling exhaust fumes.
- Warm-up: Allow the MTU engine to reach normal operating temperature before applying significant load.
- Fuel quality: Verify that the fuel meets MTU specifications and is not contaminated with water.
- Load application: Apply a moderate load (per MTU guidelines) to help burn off unburned fuel and reduce white smoke.
- Injector inspection: If white smoke persists, have injectors tested and serviced by an MTU technician.
- Compression test: Persistent white smoke with hard starting may require a compression test to evaluate engine condition.
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Repair Difficulty
Hard
4/5
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