Ford F-150 - 1997-2003 :: Really Loud Humming Noise Under The Hood
Dec 29, 2009
First off I have a 1997 F-150 4.6 with 205,000 miles on it.. stock engine and tranny. It's been a great truck and never given me any major problems. But recently something under the hood (wish i could be more specific) makes a really loud HUMMING noise (almost sound like a trumpet). For example- say im driving on the highway and i let off the gas, this humming noise will appear and it is very loud, but right when i give the engine some gas the humming goes away.
Or also when I am driving through town, when i come to a stop light, let off the gas to apply the breaks, this humming noise will come about. what i have to do is stick the truck in neutral and give it a big rev (which i do like hearing my exhaust so it isn't always annoying) and then it stops. note though, it doesnt happen every single time i let off the gas, however it is pretty frequent.
do yall think this is in the air intake system? thatd be my only guess because when i rev the engine it quits, but one thing is it sounds like it comes more from the passenger side of the truck, and it seems to occur more often when the temperature outside is cold. im completely stumped by this one, ive never heard anything like it.
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My 99 F150 4x4, 5.4 triton all of a sudden got very loud and has a loss of power. To me, it sounds like a cylinder is straight open to the atmosphere. I at first thought a spark plug blew out or an injector somehow came dislodged but I checked and everything seems ok. It's coming from the passenger side somewhere but is so loud under the hood I can't tell exactly where.
I took the valve cover off to see if a valve is stuck open or something, but I don't really know what I'm looking at as far as internal engine goes. I turned the crank by hand with a ratchet and the valves seem to follow the cams, but I've never inspected valves before so don't really know what to look for. What could be causing this loss of power and incredibly loud noise?
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First of my truck is an 03, xlt 4.6 5-speed with 82,000 miles. Almost always when i come to a stop i can hear a faint humming that is coming from the engine compartment. There is no pattern or set way that this humming happens, it just comes and goes when at idle. As soon as you put load on the motor it will go away. I got under the hood today and fired it up, nothing, gave it just a little throttle and sure enough here is this odd humming. It is coming from in the air intake. Also while i was under there i noticed that the cable that is right next to the throttle cable is very loose, i am not sure what this cable goes to or if this could be part of my problem
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My 2003 Mustang convertible (6cyl) has recently started making a loud clicking noise under the hood that seems to come on after driving in stop-and-go traffic or when turning on the a/c. I don't notice it when driving on the highway at a relatively steady speed. The clicking will continue for a minute or so and then stop for a while. I had also noticed a strange melting plastic or chemical smell coming from under the hood whenever clicking has happened. I had also noticed a couple weeks ago that at stop lights, the a/c was blowing warm air even when on the coldest setting. The air would then become cold again after driving for about a minute. What could this problem (or problems) be and can I fix it (or them) myself?
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I bought the car( like six months ago) there has always been a loud humming noise from the fuel pump ( I'm pretty sure it is the fuel pump anyways) not the normal whirring noise the fuel pump makes but a hum you can hear about ten feet away. Had no issues till just lately when the afternoons are well into a hundred degrees. That is when my car starts giving me issues. After one of these hot days on my ride home from work, I had just come off the highway and stopped at a stop light when I felt the engine bogging out, the engine stalled and I had to push it to the side of the road.
Its worth mentioning that this humming noise is much louder in the heat than the cool morning then when I turned the key to hear the fuel pump(auto fuel inject) it was louder than it has ever been, and would keep stalling on the way home, I had at the most a quarter tank of gas (gas boy is busted/stuck I think) the fuel pump is bad? Could it be the sock? I thought I read somewhere that my girl pump uses gas to cool down, and that having the tank any less than a quarter could lead to the fuel pump overheating????
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Noticed the other day when I was driving on the highway my truck started humming when I was accelerating past 30. From a dead stop to 30 its fine, but after it starts humming. Its only when I have my foot on the pedal. When I let off, it stops. The sound is coming from the rear/under.
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Problem that developed after our 03 xle got whacked by a Harley in the right front wheel. The repair shop changed out the spindle and wheel but we got it back with a loud humming noise over 40 mph. The shop said it was the axle shaft bearing and not related. I argued and the insurance company reluctantly agreed to replace the shaft,bearing, and housing. Got the car back and again, the same humming only less faint and obviously coming from the trans. Everyone is dodging responsibility and it looks like we are left to sort things out on our own. Figures. This car road perfectly prior to the accident. I can't find any online diagrams of the trans to see what the shaft fits into. Supposedly the shop is holding on to the old shaft, I was going to go and look at the end splines, I believe that's what it has.
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I just installed a cold air intake on my 01 f150 with a 5.4 and as soon as i started it after the install there is a loud humming coming from the intake but with some throttle it goes away. ive looked around on some of the other threads that suggest the iac valve usually causes this humming noise but why would it go bad with the install?? also i broke iac breather trying to remove it from the old hose to install with the new hose so i just connected the new hose directly to the inlet behind the intake until i can get another one to replace it. could this be causing the humming as well??
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2001 f150 xl with 151800 miles 5.4l had it for a few years now I get a humming type groaning coming from up front. only when in 4x4 and only at lets say 25 mph to 45 mph .seems to be worse when slowing down especially the slower you get then around 20 or 25 its gone. it is still quite noticeable on acceleration and after 45 its gone. Truck has always been a little noise while in 4x4 weather it was an issue that had already started or if that's how it is. This is my first 4x4 truck.
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Vehicle is 1998 F150 with 194k. The battery is 1 1/2 yrs old and belts and alternator are original.
Yesterday morning my VHF and dog tracking eqipment started humming with the truck running. The hum on the tracking eqpt. only happened when I pointed the antennae over the direction of the hood with truck running. When I shut truck off everything is normal. Later in the day the battery light came on. The battery light would go off if I kept it over 2400 rpm's. The charge on the dash was normal but as I got closr to home last night it dropped to almost nothing and the lights were very dim.
I am thinking alternator. What I am confused about is the humming noise in the background. The tracking eqpt. is completely separate from the truck while the VHF is direct to the battery with an iline fuse. Bad voltage regulator?
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I put a link below on the video that I made. But when I come across 1,000 RPMs weather I turn, go straight, left or right it makes this noise like a humming or rubbing noise. I took it to the dealership and they fed me crap saying when it gets worse or when it happens every time brig it back.
[URL] ....
I don't think this link is working I'm trying to figure out this iPhone. Search my YouTube channel Kill3rcr3w that's the channel I just uploaded it
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I loved my 2009 Prius until this weekend. I just turned over 31,000 miles and now a loud humming noise has developed under the hood while driving. It has not been cold here and this doesn't start until I reach around 24 mph. It remains while the gas engine is running or I'm coasting with the engine off. The humming is there in D or in N and there no sound while turning. When I am under 24 mph the noise is gone. I have set up an appointment with my Toyota dealer for this week, but wanted to know ahead of time if any other Prius owners have had this issue.
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I've had this truck almost 2 yrs now. It is not a 4 x 4. The trouble I am having is on the driver side. What happened first was while I was driving it i heard a loud squealing noise then a loud pop. After that the truck seemed fine I checked under it and everything looked ok. After that I drove it to a couple stores did fine but i heard the loud pop again. Once I left the store I was driving on the highway and it jerked to the left and i heard a grinding/rattling noise. I put my flashers on slowed down and every once in a while it would still pull to the right but the grinding noise remained constant. I parked it waited for a tow and i turned the truck around and drove it up the ramp there was another pop sound but I didn't hear the grinding. It seems to happen on and off. And it doesn't matter if I am turning or going straight.
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2000, F-150, 35K +original miles. 4.6L V8
Some weeks ago a noise started that sounded like fan blades striking against heavy plastic fan guard. At first I thought it was coming from the transmission/Transfer case area but after a few weeks of listening to I now believe it's coming from behind the dash area, however, I can't find any reason for it be from there.
The noise usually starts around 45 MPH
I checked the heater fan and it appears to be Okay. I don't know of any other fans in that area.
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I have been having some major issues with my truck!
The whole truck is vibrating when on. When I accelerate I hear a loud noise like something is hitting a fan. I'm scared to even drive it. The rpm's have been jumping around.
What could be causing this? I already replaces Fuel filters.
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I was driving today at maybe 55mph on the highway my car has 82,000 miles and I started to hear a loud jackhammer like noise come from under my hood I pulled over and popped my hood I didn't really see anything mind you I'm no mechanic but I was able to make it home but when I accelerated it got louder, what could be causing this problem? It is a 2006 Ford Mustang 4.0l v6....
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1999 ford expedition 5.4L ....I have been hearing a loudish (I can hear it in the cab) humming noise coming from the engine bay. I don't hear it when the truck is cold (1 to 5 minutes after starting), seems to get louder at it its peak (the more I drive). When i open the hood, the humming is coming from the intake. I am a pretty handy guy, just at my witts end right now....not sure, but I was thinking brake booster?
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2001 Escape 4x4, automatic trans 4x4
Getting a pretty loud "whirring" or humming noise from under the car while driving 30+ mph. It seems like a wheel bearing noise, but coming from directly under the center console area. My thoughts are either the driveshaft center support or the transfer case, I can't find much on it though.
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1996 Exp 4.0L OHV ... Wife drove it the other day, said made loud humming noise, then engine stalled. Drove it this am, did it to me too while idling in D with foot on brake... humms for about 1 min, and then stalls the engine... If I rev the engine, was still doing it... but came and went when I was driving then till I got her home...
I know there is a black plastic cap that makes a similar noise but not as loud, this seems like something else... and the fact it stalled the truck is bothersome... it started up then fine, but still. The only thing that is the same as when wife had it, is that both of these days are like under 10 degrees outside... So, me thinks MAP? or something else that doesn't like these REALLY cold temps? or??
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The last couple days my truck (1997 f150 4.6l) has been having starting issues. At first it would just turn over and not start then the battery would die. So i bought a new battery and yesterday now its starts sometimes but when trying to start it while its ttuning over it stops then starts turning and starts up. Then i drive wherever I am going when i get back in to start there's nothing.
Its not turning over at all but when i turn the key there is a loud single knocking noise coming from behind the dash near the passenger floor vent. Actually there ate two noise from the same area, one when i initially trun the key and another when i release the key. But after just sitting there doing this it will finally turn over and start. What this is, there are no codes being thrown besides my dreaded P0401 which i cant seem to get rid of either. Ive changed every part that has to do with the egr system and cleaned the throttle body replaced vacuum lines and still the code.
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I have another issue. I just started having problems when braking. Every time I brake there is thing loud grinding noise that sounds like it coming from the back tires but there isn't a squeaking noise like there is where you need new brakes what else could this be??
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