Question about 1994 Ford Crown Victoria

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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.

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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

Posted on Jun 16, 2009

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


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.

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1994 mustang humming noise coming from intake


Check the vacuum hoses for leaks. Follow them around and make sure they're all connected and not worn out to where they had fallen off due to the hoses being old and worn out. Take some soapy water in a spray bottle and spray mist the intake and see if the idle changes. Check the big hose coming from the brake booster to the intake and make sure it's connected and in good shape. Basically check everything for vacuum leaks. It sounds like that's what you're issue is.

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Load humming noise comes through air filter


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!!!

hope this helps

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1 Answer

Hesitation on acceleration, engine delay, almost cuts out in 93' Plym Gr Voyager LE with 3.8L eng. (74K mi), main use to tranport 2 wheelchair bound individuals to and from doctor appointments (is modified...


Have someone press on the gas petal while you feel the exhaust coming out of the tail pipe.It should have more exhaust coming out as the petal is pressed farther down. This method is checking for a restriction in your catalitic converter. A high flow type is best. Also make sure your air filter is clean and nothing blocking your air filters intake.

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Air intake loud "humming" noise


check to make sure nor of you vaccum line is not loose and all your clamps are tighten sound line a line is off the system and your intake is not tighten properly

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Need to check for any loose belts first .

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the sound is comming from your intake
has your air filter housing been modified in any way or is it missing a part?
what you are hearing is the idle air control solonoid opening up and allowing alot of air into the engine .

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