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Intermittent Rough/Surging Idle
My 2007 328i has an intermittent rough idle. Occasionally the rpm will surge/hiccup. It does not do this constantly, and seems to be worse when the engine is warm. The surge can be several hundred rpms. This issue showed up after I replaced the spark-plugs to correct a mis-fire. The check engine light does not come on during the idle hiccups, and my basic code reader shows no active codes. The dealer thought it may be the ignition modules need replaced, but after some reading online it appears that the VANOS solenoids may be another possible source. Without codes is there a way to determine if the issue is the solenoids or the ignition modules.
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