Ford Fusion 2012 v6, 60K miles, engine makes sucking noise, suck, suck, suck, with frequency proportional to rpm, only when pressing the gas pedal, at low rpm, otherwise, other normal noise engine hides the sucking. It quiets instantly if I lift the foot from the pedal. No apparent loss of power, yet.
You should check the air cleaner box to make sure that it is securely latched, and also check the integrity of the intake leading from the air cleaner box to the engine.
1 Like