93 5.0 engine whistle noise, any suggestions?

BUCKZ6319 · Dec 28, 2014

here is a short video of the engine warmed up, and the whistling started, you will also here the cooling fan cut on, and it may sound like the engine rpms are increasing, but there not, just a steady idle

sorry, not sure how to not have a link to the video. I have tried several ways to just put the video here.
thanks for any input, this is my bosses, sons mustang. I just finished doing quite a bit of work on it, and he is concerned with this noise. I must say I had 2 90s mustangs in the past, and never had a noise like this.

http://youtu.be/bv4t8PbWt4o

cookiewhistle · Dec 28, 2014

Sounds like your throttle body. Are you running a BBK?

BUCKZ6319 · Dec 28, 2014

Not sure which throttle body he has, but I will ask him
thanks for your input.

narleycarley · Dec 28, 2014

I wouldn't worry about it. I had a friend who changed to a gt40 tubular intake and I had a car that I changed ago a bigger TB and it started the whistling noise on both cars. Same as this one. Nothing bad happened. Not sure why though. Maybe because the tubular changes air pattern? Blocks engine noise differently? The bigger TB allowed more air? I dunno.

Sent from the mobile cellular device.

BUCKZ6319 · Dec 28, 2014

narleycarley said:
I wouldn't worry about it. I had a friend who changed to a gt40 tubular intake and I had a car that I changed ago a bigger TB and it started the whistling noise on both cars. Same as this one. Nothing bad happened. Not sure why though. Maybe because the tubular changes air pattern? Blocks engine noise differently? The bigger TB allowed more air? I dunno.

Sent from the mobile cellular device.

Thanks for the input, makes sense to me.
hasn't caused any issues yet that I know of

anthonydalrymple · Dec 29, 2014

If it is a BBK or an off-brand throttle body; you can improve the situation some if it really bothers you. I removed the IAC valve & ported the airway. Basically, I smoothed all the sharp edges, especially the leading edge of the "hole" as it enters the inner part of the throttle body. Doing this nearly eliminated the whistle on my former BBK TB; reduced it to a short "chirp" at a specific rpm only....

ADL · Dec 30, 2014

That whistling sound is really the result of a harmonic or resonance that seems to be a phenomenon of the GT40 tubular intake. All of the tubular GT40's that I have experience with made that noise to some degree. Some less, some more. It can drive people nuts thinking they are chasing an incurable vacuum leak.

It wouldn't hurt to try the above mentioned throttle body modifications and see if it helps any.

BUCKZ6319 · Dec 30, 2014

thanks for all the information regarding this issue.

I finished the work on the mustang and returned it to the owner. If this issue still bothers him, I will mention the suggested procedures.

thanks again...

Danno · Jan 6, 2015

If it's helpful, I had a similar issue that was driving me nuts. I took a can of carb cleaner and started spraying various parts of the engine. In my case, I thought it was a vacuum leak, so by spraying carb cleaner I was hoping the leak would ingest the carb cleaner (which is combustible) and I'd hear the engine rev when I found the leak. I eventually found it - it turned out to be a very small leak on the air intake where the prior owner or the last mechanic to touch it hadn't fully tightened the hose clamp. The carb cleaner trick works great for stuff like this.

paclives777 · Jan 12, 2015

Could be the PCV valve whistling also.

93 5.0 engine whistle noise, any suggestions?

BUCKZ6319

cookiewhistle

BUCKZ6319

narleycarley

BUCKZ6319

anthonydalrymple

ADL

BUCKZ6319

Danno

paclives777

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