Direct Injection Engines and Carbon Deposits - Engine Builder Magazine
▻https://www.enginebuildermag.com/2015/01/direct-injection-engines-carbon-deposits
Die überzüchteten Benzinmotoren der neuesten Generation zeigen häufig Leistungsverluste aufgrund von verrußten Ventilen und Ventilsitzen. Da lobe ich mir meinen alten Diesel.
One of the common problems with direct injection engines is their tendency to develop carbon deposits.
Symptom: Misfire codes, stumbling and suspicious fuel trim numbers. On a scan tool, the engine may show a loss in volumetric efficiency. The driver may complain about a loss of power, poor fuel economy and hard starts.
Cause: Carbon deposits on the intake valves. Deposits cause the air to tumble into the combustion chamber, and this turbulence causes the air/fuel mixture to be unevenly distributed. When ignited, the flame front can be erratic, leave unburned fuel and create hot spots in the combustion chamber.