Diagnosing An Idle Issue Without An Engine Light or Error Code, Pt 1

Most idle problems, such as rough idle, the engine cutting out at idle, or idling too fast, are problems with the fuel: air mixture. Finding the problem causing that mixture issue can be difficult, especially on modern engines with sophisticated fuel injection systems that are made to trip sensors and give codes when a fault occurs. When no codes are set, it can get confusing.

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