Question about 2001 Cadillac Sts

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Car idles very high when first started then a loud humming noise mechanic says its an air diverter valve

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He is probably right. It is part of the fuel injection intake near the air filter. Change the air filter if it needs it and check the air filter box and make sure it is sealed correctly. There may be a gasket that keeps that box sealed correctly.

Posted on Jan 06, 2015

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Posted on Jan 02, 2017

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SOURCE: Very High Idle speed

no prob not and i had the exact same problem and bought the part from advance auto it was like $80 and it's a diy thing i'm an 18 year old female and could do it my self just need the part and 6 star screw driver...it's right there on the right side when you open the hood

Posted on Mar 17, 2010

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too little information to go by..humming noise..what year/model/engine etc....

however i assume it s a ford and it is most likely caused by a sticky idle air control valve...they tend to hum and "hoot" when sticking, this may be associated with stalling at idle and/or hard starts unless aplying gas pedal. you can identify the idle air control valve as it is attached to most of the engnies by 2 botls and has about a 3-4" silver tube extending abaw from bolts, it is on top of the engine. when these make noise and backfeed through the air box a vibration can be felt from it. there will be a wire goinf to the valve, unplug it whil engine is running and when you hear the humming..if noise gone once it is unplugged...replce it WITH A FACTORY PART!!!

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Growling engine noise only at idle. Cam area


Take all of the belts off for a short run at idle. If the sound goes away it is pulley related, spin each pulley and listen for bearing noise, also check for play at this time.

If the noise does not go away when the motor is driving no accessories you have a more serious problem.

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Car making loud humming noise from the air intake or air filter when idling ,a/c on and pressing gas petal.


the idle air bypass valve is making noise and resonating through the air inlet the valve needs to be replaced there is also a revised hose to the valve to reduce noise if it hasn't already been replaced

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It sounds like the cylinder is part of the emission control system. It is probably a valve which is stuck inside. Remove it and clean it with wd-40. If this doesn't work, let me know.

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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

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I had experienced the same problem with my 93 TC. I'll try to make it short. Replace the Idle Control Valve. Cost me $50 at AutoZone. It has a electronic plunger that has a rubber o ring on the end of it. It separates two air chambers inside the valve. When the rubber gets old and the plunger is suppose to cut off the air coming in from one chamber to the other, the air gets sucked between the chambers across the old rubber causing the humming noise. That is also why the engines revs up and down and wont idle right. It is located between the firewall and the back of the motor just to the left (drivers side) of the throttle control assembly. When you look up on the internet on how to replace it, it will tell you to remove all the housing surrounding the wiper blade control arms and assembly so that you can access it. If you take your time, just remove some of the hoses and wires connected around it and you can access it without removing all that ****. Only has two screws to it that point up and can be reached with a ratchet and extension. Car runs great now and finally got rid of that noise.

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