1.1 本试验方法涵盖了评估无铅火花点火发动机燃油污染电子端口喷油器（PFI）趋势的车辆试验程序。 1.2 本试验方法适用于无铅火花点火发动机燃料，其中可能包含抗氧化剂、缓蚀剂、金属钝化剂、染料、沉积物控制添加剂和氧化物。 1.3 以国际单位制表示的数值应视为标准。括号中的值仅供参考。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 本试验方法中给出了具体的预防说明。 注1: 如果对测试方法的最新版本有任何疑问 D5598 ，联系ASTM总部。 规范中描述了对火花点火发动机燃料具有重要意义的其他特性 D4814 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 试验方法- 枢轴式电子喷油器的计量表面容易形成沉积物。这些沉积物减少了通过计量孔的燃油流量。计量燃油流量的减少会导致空燃比紊乱，从而影响排放和驾驶性能。当沉积物足够重时，这些沉积物可能会导致驾驶性能症状，如犹豫、起动困难、断电或其组合，普通驾驶员很容易注意到这些症状，并导致客户投诉。 矿床的形成机制尚不完全清楚。它被认为受到许多因素的影响，包括行驶循环、发动机设计、左舷喷油器设计和所用燃油的成分。已发现本试验方法中的程序在一致的基础上在喷油器中形成沉积物。该程序形成的沉积物在成分和沉积量方面与现场经历的沉积物相似。该程序可用于评估无铅基础燃料和燃料添加剂的差异。 5.1.1 州和联邦立法和监管行动- 立法和监管活动，主要由加利福尼亚州负责 6. 和联邦政府 7. 必须接受标准试验方法，以评估汽车火花点火发动机燃油的端口喷油器沉积物形成趋势。 5.1.2 结果的相关性- 本试验方法中使用的发动机和车辆的工作条件和设计并不代表所有现代汽车。 在解释测试结果时，必须考虑这些因素。 5.2 测试有效性: 5.2.1 程序合规性- 除非测试按照本测试方法的所有要求完成，否则测试结果无效。与第节中给出的参数极限的偏差 10 将导致无效测试。在评估任何异常时，必须在测试方法执行期间应用工程判断，以确保测试结果的有效性。 5.2.2 车辆合规性- 除非车辆符合质量控制检查要求，否则测试无效 8.2 .

1.1 This test method covers a vehicle test procedure to evaluate the tendency of an unleaded spark-ignition engine fuel to foul electronic port fuel injectors (PFI). 1.2 The test method is applicable to unleaded spark-ignition engine fuels which may contain antioxidants, corrosion inhibitors, metal deactivators, dyes, deposit control additives, and oxygenates. 1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are provided for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given throughout this test method. Note 1: If there is any doubt as to the latest edition of Test Method D5598 , contact ASTM Headquarters. Other properties of significance to spark-ignition engine fuel are described in Specification D4814 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 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 California 6 and the Federal Government 7 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 .