4.0 humming problem - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-23-2009
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4.0 humming problem

So i put a K&N on the good old 4.0, after a week or so it would start to make an unbelievable loud humming noise. it was on and off coming in weeks at a time, so i decided to put the stock filter back on. i thought i fixed the problem but i did not, it still hums but not as loud or as much. any ideas and solutions would be very well apprciated
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Old 08-24-2009
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replace the idle air control valve. seen it a million times
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