In many applications, idle speed voltages should hover around 0.7 volts. Voltage tests are similarly more indicative rather than definitive. According to my own experience, grams-per-second is an indicative, rather than definitive, analysis of MAF performance. In other words, 3 GPS at idle would be correct on a 3L engine. Some aftermarket trainers have also suggested that the GPS number on a good MAF will equal the engine’s displacement in liters at idle speed. For example, an OE procedure might include GPS readings at idle, at 1,500 rpm, and perhaps at 2,500 rpm, to analyze MAF performance. Off the top, I’ll say that a few entry-level Asian nameplates use the GPS method to analyze MAF performance.
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