K&N FILTER PROBLEMS...
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New User
Joined: Jul 2005
Posts: 13
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K&N FILTER PROBLEMS...
All:
I just installed a K&N 77 series performance filter kit on my 1997 F150 4.6L 4X4..followed the instructions to the 'T'...everything's tight and fits snug...I test drove it and loved the sound..UNTILL this hum started....HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM.. .kinda loud,,it comes and goes around idle...HELP!!
thanks
Loaf
I just installed a K&N 77 series performance filter kit on my 1997 F150 4.6L 4X4..followed the instructions to the 'T'...everything's tight and fits snug...I test drove it and loved the sound..UNTILL this hum started....HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM.. .kinda loud,,it comes and goes around idle...HELP!!
thanks
Loaf
No Problem.
Thread Starter
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New User
Joined: Jul 2005
Posts: 13
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This ain't a GRRRRRRRRRRRRRRR when driving ( which i love the sound of ). It's a loud hum like a trumpet when the car is idle or has just been started. Could it be a vacuum problem, because if you put your hand near the filter it feels like it's sucking. If it's this how do i fix it? thx
Tuned
Joined: Mar 2006
Posts: 374
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From: Georgia
I had the same issue with my old expedition 5.4. After about a week of pulling my hair out I found the problem. The elbow on my vaccuum line for what I believe was my pcv valve(runs from the valve cover to the rear of the manifold) the elbow on it which is supposed to be a hard plasic was replaced by a section of hose. It got hot, and weak, then collapsed so to speak and was pinching together causing a trumpet sound like you said. If you hit the throttle does it stop? When you hit the throttle it by passes that valve thats how i narrowed mine down. good luck on your annoying adventure and keep us updated.
