Humming coming from air intake
There is a humming coming from the engine when I stop the RV or when the RV is in idle. This morning i was able to narrow it down to the air intake. When I give the engine just a little gas it goes a...
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Oops forgot to include the year of the RV. It is 2004 E350. Also just checked all the hoses and housing and no cracks, etc that I could see.
