Unresolved Roar
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Unresolved Roar
Reference this thread:
https://www.ford-trucks.com/forums/3...-up-noise.html
I was helping the OP diagnose this noise because I was trying to figure out what would cause it. Turned out the roar in my engine came back last weekend after I got stuck pretty bad and had to rev it up to get out.
The intake tube vibrates during the roar - almost like the sound and vibration of a loose bearing at high RPMs - and when the engine begins to idle back down, it quits.
This same "roar" occurs in gear on the road at lower RPMs. I'm stumped.
https://www.ford-trucks.com/forums/3...-up-noise.html
I was helping the OP diagnose this noise because I was trying to figure out what would cause it. Turned out the roar in my engine came back last weekend after I got stuck pretty bad and had to rev it up to get out.
The intake tube vibrates during the roar - almost like the sound and vibration of a loose bearing at high RPMs - and when the engine begins to idle back down, it quits.
This same "roar" occurs in gear on the road at lower RPMs. I'm stumped.
Senior User
Joined: Dec 2008
Posts: 439
Likes: 4
From: Lubbock, Texas
Have you checked the center drive-shaft barring? I had to put the truck on a lift and then put the truck in drive to identify the problem. It can roar and make different noises at different speeds. It's easy to check, hope that helps.
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
It can't be the carrier bearing and this roar happens during cold weather or hot, or if it has just been fired up or has ran all day.
I can lay my hand on the air box and feel the vibration.
Thanks for the replies!
I can lay my hand on the air box and feel the vibration.
Thanks for the replies!
Posting Guru
Joined: Sep 2008
Posts: 2,498
Likes: 2
I have another thought, sometimes a broken exhaust stud/studs can cause this. Excapeing air can as we all know make weird nosies and of course air will creat viberation which translates into noise.
I don't think it would be a waste of time to check the exhaust manafold studs.
I don't think it would be a waste of time to check the exhaust manafold studs.
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
No, not the studs, but I appreciate the feedback.
If I get off work this weekend, I may tear into the air box, clean the MAF sensor, check the throttle plate and look for any build-up. Will let you know.
Thanks for the replies!
If I get off work this weekend, I may tear into the air box, clean the MAF sensor, check the throttle plate and look for any build-up. Will let you know.
Thanks for the replies!
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Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Bump
FYI - the "roar" develops between 900 and 1400 RPM's, but not constant. The most frequent is between 1150 and 1250 RPM's. This is load or no load.
Still waiting for time off to check it out.
FYI - the "roar" develops between 900 and 1400 RPM's, but not constant. The most frequent is between 1150 and 1250 RPM's. This is load or no load.
Still waiting for time off to check it out.
FTE Legend
Joined: Apr 2010
Posts: 127,357
Likes: 3
From: Peoria, Illinois
My bad! The black cone on the air filter element would not make its way to the throttle body but be stopped by the MAF. Still causing a turbulence in the air flow and a possible noise in the air intake.
