Standard Test Method for Evaluating Unleaded Automotive Spark-Ignition Engine Fuel for Electronic Port Fuel Injector Fouling

Importancia y uso:

5.1 Test Method—Deposits are prone to form on the metering surfaces of pintle-type electronic fuel injectors. These deposits reduce fuel flow through the metering orifices. Reductions in metered fuel flow result in an upset in the air-fuel ratio, which can affect emissions and driveability. When heavy enough, these deposits can lead to driveability symptoms such as hesitation, hard starting, loss of power, or a combination thereof, that are easily noticed by the average driver and lead to customer complaints. The mechanism of the formation of deposits is not completely understood. It is believed to be influenced by many factors, including driving cycle, engine design, port fuel injector design, and composition of fuel used. The procedure in this test method has been found to build deposits in injectors on a consistent basis. The deposits formed by this procedure are similar to the deposits experienced in the field in terms of composition and in amount of deposition. This procedure can be used to evaluate differences in unleaded base fuels and fuel additives.

5.1.1 State and Federal Legislative and Regulatory Action—Legislative and regulatory activity, primarily by the state of California6 and the Federal Government7 necessitate the acceptance of a standard test method to evaluate the port fuel injector deposit-forming tendency of an automotive spark-ignition engine fuel.

5.1.2 Relevance of Results—The operating conditions and design of the engine and vehicle used in this test method are not representative of all modern automobiles. These factors must be considered when interpreting test results.

5.2 Test Validity: 

5.2.1 Procedural Compliance—The test results are not considered valid unless the test is completed in compliance with all requirements of this test method. Deviations from the parameter limits presented in Section 10 will result in a void test. Engineering judgment must be applied during conduct of the test method when assessing any anomalies to ensure validity of the test results.

5.2.2 Vehicle Compliance—A test is not considered valid unless the vehicle has met the quality control inspection requirements in accordance with 8.2.

Subcomité:

D02.A0.01

Referida por:

D4814-24A, D6421-20, D4814-24A, D4814-24A

Volúmen:

05.02

Número ICS:

75.160.20 (Liquid fuels)

Palabras clave:

deposit control additive; deposits (in internal combustion engines); driveability; electronic port fuel injector (PFI); flow rate; fouling; fuel rail; hot soak; pintle; spark-ignition engine fuel ;