The sound comes from under the hood, like a bad belt or maybe a pulley or alternator bearing but it goes away while accelerating under load, but not much change when just revving the engine.
So I’m poking around under there while the engine is squealing like a pig, and pull out the oil fill cap which is mounted in the valve cover. Like magic the noise disappears. If I put the cap back it returns. If I put my hand over the opening there is a strong vacuum sucking it in.
Is there supposed to be such a strong suction? Could there be a clog in the ventilation system? Even with over 250,000 miles the car runs great other than for a transmission issue that I’ll ask about in another message. Short of driving around without an oil cap, what should I do to fix this?
So I’m poking around under there while the engine is squealing like a pig, and pull out the oil fill cap which is mounted in the valve cover. Like magic the noise disappears. If I put the cap back it returns. If I put my hand over the opening there is a strong vacuum sucking it in.
Is there supposed to be such a strong suction? Could there be a clog in the ventilation system? Even with over 250,000 miles the car runs great other than for a transmission issue that I’ll ask about in another message. Short of driving around without an oil cap, what should I do to fix this?
