1az Fse Engine Toyota Repair Manual Updated -

Because the fuel is sprayed directly into the cylinder, no fuel washes over the intake valves. They get caked with carbon.

Direct injection often leads to carbon deposits on intake valves. The most effective cleaning methods are walnut blasting or specialized chemical processes. 1az fse engine toyota repair manual

If you are repairing this engine, these are the "features" you must pay attention to: Because the fuel is sprayed directly into the