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2006 F150: I PUT A BRAND new..NOISE COMING..VALVE COVER..LOUDER…

Customer Question
I PUT A BRAND NEW...
I PUT A BRAND NEW ENGINE[5.4L] IN A 2006 F150 4X4.CUSTOMER HAS PUT APPROX.4000 MILES ON IT AND IT RUNS AWESOME.LAST WEEK HE COMPLAINED OF A HIGH PITCHED SQUEAL NOISE COMING FROM ENGINE AREA.THROUGH PROCESS OF ELIMINATION,NARROWED IT DOWN TO CRANK PULLEY AREA.THE ENGINE MANUFACTURER TOLD ME TO POP OFF THE PCV LINE FROM DRIVER VALVE COVER TO SEE IF NOISE GOES AWAY[IT DID].HE SAID ITS A BAD PCV AND HE TOLD ME TO REPLACE THE VALVE COVER[SINCE THE PCV DOESNT COME OUT.SO I REPLACED IT AND NOISE IS STILL THERE, AT IDLE, IN PARK, OR SITTING AT A RED LIGHT [JUST LIKE BEFORE].NOISE IS ONLY THERE AT IDLE,SOON AS YOU TOUCH THE GAS IT GOES AWAY.NOISE SEEMS TO BE LOUDER WHEN ENGINE IS COLD AND CONTINUOUS.WHEN THE ENGINE WARMS UP ITS STILL THERE,BUT NOT AS LOUD AND INTERMITTENT.PLEASE HELP!I DONT HAVE ANYMORE HAIR TO PULL OUT OF MY HEAD!
Submitted: 8 years ago.Category: Ford
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Answered in 5 minutes by:
6/24/2010
Ford Mechanic: Daryl, Shop Owner, Master Mechanic replied 8 years ago
Daryl
Daryl, Shop Owner, Master Mechanic
Category: Ford
Satisfied Customers: 12,551
Experience: 28 years experience, Master Mechanic
Verified

I would probably try a front seal, it must be leaking vacuum if it stops when you remove the PCV and the pcv is surly not the problem now so maybe the seal is damages.

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Customer reply replied 8 years ago
I RAN AN INTAKE MANIFOLD VACUUM TEST[NORMAL READING IS BETWEEN 15-22 IN-HG]AND IT WAS 20-21.5 EACH TIME.SO IF THE FRONT SEAL WAS LEAKING VACUUM,WOULDNT THE VAC TEST READING BE ALOT LOWER
Ford Mechanic: Daryl, Shop Owner, Master Mechanic replied 8 years ago

Since it is squealing it is a very small leak so I would not think it would be much lower than normal.

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