FORD VEHICLES IDLE PROBLEMS, Ford vehicles with an Idle Air Control Motor (called IAC) that have idle problems and sometimes noise concerns can be diagnosed in the following manner. For high idle problems, try unplugging the IAC motor. If the idle drops, its usually due to an input signal to the computer which results in the computer raising the idle speed. This is the control side of he circuit. With the ignition key “On”, engine not running, you should measure battery voltage on this wire. When the engine is running, you should notice a voltage change. Typical operating temperature, normal idle voltage should be approximately between 9 to 10.5 volts DC. This equates to a 30% duty cycle. Cold engine readings should reveal a lower voltage reading with a higher duty cycle.which leads to the fuel pump (refer to engine diagram #6). GM 6.5L DIESEL ENG.-NO START.
Tags : ford vehicles, ford engine, noise concerns, voltage change, cold engine, battery voltage, duty cycle, input signal, fuel systems, fuel pump, volts, idle air control motor, gm, diesel, ford
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