Question about 1993 Lincoln Town Car

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93 Lincoln TC Intermittant humming noise.

My 93 TC is doing the same thing. I found that the 1/2 rubber hose thatconnects to the driver side of the throttle assembly is where the humcomes from. It connects to a metal tube that then goes down between thefirewall and motor to who knows where. I can disconnect it from thethrottle assembly and it hums as loud as a fog horn. It only does itfrom time to time. And also seems to cause an periodic enginerev.Whatever this hose goes to it sucks air down it hard. I haven'tfound any leaks or cracks in the hose, so anyone out there know why allthe noise and how to fix it.

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I replaced the Idle Control Valve and that solved the problem. Inside the ICV is a rubber grommet on a spindle that separates two channels of air. When its in the closed position and the rubber seal is old, the air is pulled through it and that is what causes the humming noise. Also the reason for the periodic engine rev.
PS. Online sites said to remove the wiper blade/control housing to get to it. You don't need to do that if you have some patience and just unplug a few things around it and reach into it.

Posted on Nov 25, 2008

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The have a replacement hose assy to reduce the noise but usually it is the idle control valve that causes the noise

Posted on Nov 25, 2008

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