Humming Howling noise from pass fender - Mustang Evolution

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Old 09-10-2013, 07:46 PM   #1
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Humming Howling noise from pass fender

So its been a year since I swapped in a GT drivetrain into my car (4.6, T3650, 8.8, comp etc.). It was done professionally and the car has been sound from the get-go. The only complaint I have is a really loud humming noise that occasionally occurs upon starting the car as well as when I take my foot off the gas after cruising for 5+ minutes. If it starts from a start up if I rev the motor it sometimes goes away, but if i'm at a light and it happens I don't like revving because people think i'm trying to race every time i'm at a light and it happens. Lastly it sometimes goes away on its own and then the car almost dies (rpms drop to 300-400), but it saves itself???? Its really loud and comes from the fuse-like Box seen in the pics below. I took off the passenger side fender to get a good look at it. Can anyone tell me what to do to make this noise stop. Car runs perfectly fine otherwise. Any help is appreciated. I've seen on other sites this may be a fuse issue, some others say IAC, but no noise is coming from the IAC. Oh and yes it has done this since the install. Doesn't happen all the time, but 50% of the time. Thanks.
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Old 09-10-2013, 08:44 PM   #2
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I have the same thing going on with my car.
I've been suspicious of the anti-lock brake system but everytime it makes the "humming" noise, it stops before I can get the hood open to check it out.
Your ABS light doesn't happen to be on, does it?
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Old 09-10-2013, 08:50 PM   #3
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No. I don't even have ABS so no worries there, however my theft light blinks a lot for about 1-3 mins or so. This box is known as the CCRM. Apparently I have to find out where the ground wire leads too from this thing because according to many other threads this buzzing/humming, or howling noise is quite common when there is a bad ground somewhere. Now some people's car's don't start and they hear this buzzing noise too so I'm glad that's not my problem, but what ground bolt/wire is responsible for the CCRM. I've checked the two grounds (green bolts) in front of the battery and both of those are tightly secured. There is one wire actually cut that is about 8 inches closer to the headlamp housing (a black wire at that). Could this be the problem? Its in-between the CCRM and the turn signal light/clip.
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Old 09-10-2013, 08:57 PM   #4
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Hmmm. Curious why your car doesn't have ABS?
Anyway, interesting. I'll be home in a bit and take a look at the wiring diagram.
Your car started life as an 02 V6 right?
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Old 09-10-2013, 09:09 PM   #5
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ABS was an option that only came on certain models. Yes my car was a 2002 premium package True Blue Vert 3.8L automatic, however it doesn't have ABS. ABS, to my knowledge was only on cars that came with the traction control package. I know I don't have it, because when I do brakes I've never had to disconnect the sensor from the rotor nor do I have a ABS module in the engine bay. I also edited my last post to show the wire that is cut.
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Old 09-10-2013, 09:50 PM   #6
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Ok. It shows a black/white wire coming out of the CCRM as being the ground to the chassis.
I'm not seeing any "all" black wires that involve the CCRM though. Only black with an orange stripe. There is a dark blue. Could that be it? It goes to the PCM and it's highly unlikely that your car would be runnlng though. Lol.
Anyway, that's the only ground for the CCRM.
Didnt know ABS was an option. Your lucky that you don't have it. The whole system is a pile of crap... My malfunctioning ABS/traction control gave me nothing but problems at an autocross last Sunday.

I was pissed...
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Old 09-10-2013, 10:03 PM   #7
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Yea I like pumping brakes...haha actually I found out years ago when some idiot decided to run a red light and I missed him by inches. Ill look for the black/white wire and its ground. Well this solid black wire is not going to the CCRM, but it is connected to the same wiring harness, just 8 inches past the CCRM closer to the turn signal connector.
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Old 09-10-2013, 10:17 PM   #8
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Haha . I hear you! Ive never been a fan of ABS.
Every all black wire that I see on the schematic is a ground of some sort. Id investigate further.
I'll see if I can track down what it may be a little later, but I'm really not the "sharpest tool in the shed" when it comes to this stuff. Lol.
Good luck and be sure to update what you find.
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Old 09-12-2013, 11:25 AM   #9
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The "howling" might be the Idle Air Control valve. When the internal valve plunger wears it vibrates in the housing, the vibrations back up in the intake and make it honk/howl/sound like a french horn--click here for more about this...
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Old 09-12-2013, 11:38 AM   #10
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It could be a wolf getting up in there
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Old 09-12-2013, 12:23 PM   #11
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Quote:
Originally Posted by cliffyk View Post
The "howling" might be the Idle Air Control valve. When the internal valve plunger wears is vibrates in the housing, the vibrations back up in the intake and make it honk/howl/sound like a french horn--click here for more about this...
French horn describes the sound that I'm hearing well. This makes sense, since the sound goes away when the engine speed is increased.
I already have a new one in the stack of new parts that I've acquired. Just need to install it...
Thanks again Cliffy!
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Old 09-12-2013, 09:18 PM   #12
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Whoops stupid apple
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Old 09-12-2013, 09:29 PM   #13
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Yea I saw that thread too and was wondering if it could be that, but at least I didn't need ford to tell me it was that for the same price I'm paying to possibly replace both. Thanks man.
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Old 09-13-2013, 11:06 PM   #14
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Well I replaced the IAC and put the car back together with the stock CCRM and started it and its idle was Fine. I have 14 days to return the $215 CCRM without a 20% restocking fee so I'll drive it for a week and see what happens. Hopefully no weird noises (French horn etc).. Bought a duralast IAC from auto zone for $53 slim saving myself $162 as long as the noise disappears. Thanks again cliffy
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Old 09-14-2013, 12:33 AM   #15
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Awesome! Hopefully that is the noise.
Ironically, mine hasn't done it for more than a week now. Its very intermittent.
Again, keep us posted.
Good luck!!!
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Old 09-14-2013, 09:33 AM   #16
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Well took her for a spin after getting the fender put back on (PITA BTW) and no sound thus far, but yea mine can also do it intermittently. I'm going to drive the car all week and put my ranger in the garage. Hopefully no sounds, but I'll keep you posted and definitely want my $215 back = new plenum and TB to finish off the intake....just can't tell the wife...haha
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Old 03-18-2016, 02:53 PM   #17
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Quote:
Originally Posted by runvsofthisbull View Post
Well took her for a spin after getting the fender put back on (PITA BTW) and no sound thus far, but yea mine can also do it intermittently. I'm going to drive the car all week and put my ranger in the garage. Hopefully no sounds, but I'll keep you posted and definitely want my $215 back = new plenum and TB to finish off the intake....just can't tell the wife...haha
I know this thread is dead but did replacing the IAC solve the issue?
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Old 03-18-2016, 10:30 PM   #18
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I know this thread is dead but did replacing the IAC solve the issue?
If the howling/honking is caused by a worn IAC (as described here) then replacing the IAC will fix it...
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Old 03-18-2016, 10:50 PM   #19
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If the howling/honking is caused by a worn IAC (as described here) then replacing the IAC will fix it...
It's great to hear from you Cliffy!
Hope you've been doing well.
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Old 03-19-2016, 10:46 AM   #20
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It's great to hear from you Cliffy!
Hope you've been doing well.
Thank you for the kind thoughts.

I am doing well but cannot drive much anymore, even with the slushbox; only did about 4000 miles last year.

I did find that Mercedes' instrumentation is not as good as they claim--the U.S. DOT mandated speed-limiter on the SL500 is supposed to kick in at 155 mph but the car would not go over 153.8 per my GPS. I should probably see if we can set up a class-action suit...
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Old 03-19-2016, 02:08 PM   #21
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Thank you for the kind thoughts.

I am doing well but cannot drive much anymore, even with the slushbox; only did about 4000 miles last year.

I did find that Mercedes' instrumentation is not as good as they claim--the U.S. DOT mandated speed-limiter on the SL500 is supposed to kick in at 155 mph but the car would not go over 153.8 per my GPS. I should probably see if we can set up a class-action suit...
Well you know, their defense to that will probably be that your car does not have the same tires on it, as when it left the factory in Stuttgart. They are a slightly smaller diameter, thus, accounting for the lower top speed than the factory specification... Or something like that. Lol
At least you put more miles on your Mercedes than I put on my Mustang. I probably did less than 2,000!
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