7.3 IDI weird humm
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Junior User
Joined: Jul 2010
Posts: 54
Likes: 1
From: Jacksonville Florida
7.3 IDI weird humm
OK guys here is a strange one, I have a 91 Ford Super Duty with the 7.3 IDI and yes it is Naturally aspirated. For some reason I get asked if it is turboe or non-turbo.
Any way, I pulled my air cleaner earlier today to inspect the filter, after I put it back together I developed a Humming noise coming from the air cleaner intake, it is really noticable at 900 rpm then it blends in with the other sounds the truck makes as the rpm's increase but it does not go away.
I did put in a new air filter and that did not help, but if you throttle the air intake with your hand the noise appears to go away.
Has anyone ever run across this before, just seems odd that it started after I pulled the air cleaner off, it maybe coincidence, but it does appear to be getting more noticable the longer you run the truck.
Any way, I pulled my air cleaner earlier today to inspect the filter, after I put it back together I developed a Humming noise coming from the air cleaner intake, it is really noticable at 900 rpm then it blends in with the other sounds the truck makes as the rpm's increase but it does not go away.
I did put in a new air filter and that did not help, but if you throttle the air intake with your hand the noise appears to go away.
Has anyone ever run across this before, just seems odd that it started after I pulled the air cleaner off, it maybe coincidence, but it does appear to be getting more noticable the longer you run the truck.
Thread Starter
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Junior User
Joined: Jul 2010
Posts: 54
Likes: 1
From: Jacksonville Florida
The intake tubing was removed before I got the truck, so it is direct flow from the engine compartment into the air filter cannister.
I did not see anything that is in the intake, or on the inlet screen.
The Filter is new, should I replace the inlet screen or leave it alone?
I did not see anything that is in the intake, or on the inlet screen.
The Filter is new, should I replace the inlet screen or leave it alone?
Posting Guru
Joined: Dec 2009
Posts: 1,272
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Only thing else I can think of is it may be the normal sound of the engine,,if you replaced a bad dirty filter its getting the proper air flow now where it was restricted before. I think I would leave it alone..
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
You should get some type of tube on it to get it uot to some fresh cool air. All that hot engine bay air will not be good for power or mileage.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I am going to say the throttle cable is vibrating on the air cleaner housing or one of the injection lines.
Check the foam insulator around the cable back where it crosses the injection lines.
Also make sure the filter housing is turned and seated correctly.
Could even be something like the housing bolt is not tight enough.
Check the foam insulator around the cable back where it crosses the injection lines.
Also make sure the filter housing is turned and seated correctly.
Could even be something like the housing bolt is not tight enough.
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Junior User
Joined: Jul 2010
Posts: 54
Likes: 1
From: Jacksonville Florida
Kenpobuck...that is one of the many things I plan to fix on her, I do not know why they took it off to begin with, she probably needs new injectors too. I am in Florida an the outside air is not that much cooler but every little bit helps.
Dave...I never thought to check the throttle cable, I have been so concentrated on the sound and that it appears to be coming from the air can to even look at the throttle cable. I will definitely check that out.
Dave...I never thought to check the throttle cable, I have been so concentrated on the sound and that it appears to be coming from the air can to even look at the throttle cable. I will definitely check that out.
