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Engine Whistling Noise? 

 

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 Post subject: Engine Whistling Noise?
Posted: Fri May 23, 2008 4:17 pm 
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Quite a loud whistling noise coming from my EF engine bay.. sorta sounds like an aeroplane taking off/landing. Hasnt seemed to affect my economy, idle is fine and the noise doesn't pick up with revs.

Any quick ideas before I take her in to get looked at?

 

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Posted: Fri May 23, 2008 4:23 pm 
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ive got that same problem!!!!


but your problem is most likely a vacuum hose leak or something.
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Posted: Fri May 23, 2008 4:33 pm 
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U sure its not just ur turbo? lol just kidding..

its really annoying!! cant seem to find where its coming from.. seems to be from throttlebody area but cos everythin else is so loud cant be sure. you can fullon hear it from inside the car tho.. it also seems to disappear every once in a while..

 

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Posted: Fri May 23, 2008 4:54 pm 
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yeh ive had that issue when it was NA.

its not your map sensor vacuum line, because you still have good idle and fuel economy

try tightening up all the clamps on the air intake :)

check for carbon around the head (near exhaust manifold)... carbon buildup = loose bolts
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Posted: Fri May 23, 2008 4:59 pm 
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took the air intake off and still does it so wont be loose clamps.. woulda shot myself if that was it haha! will check exhaust bolts..

another development.. seems to go away when car is warmed up,, gahh wat a pain in the a**! gonna make it harder to find.

Tocchi, did u end up finding out wat the cause was prior to turbo? Or just whack it on n not worry bout it?

 

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Posted: Fri May 23, 2008 5:23 pm 
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checked the rocker cover breather? the back one.

when thats off it'll whistle

 

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Posted: Fri May 23, 2008 5:46 pm 
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I got that same noise, except mine sounds like a supercharger. but mine is due to my cam choice and a few other mods, its N/A though, those that have heard it instantly recognise it.

 

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Posted: Fri May 23, 2008 5:54 pm 
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Krytox, just checked that hose. Its on and tight.. grr. Makes it hard now that the engine is warm and the noise is gone. Ill let it cool down and check power steering pump, tranny fluid, etc. although I very much doubt it be that.

dc_todd ahhh I wish it was like that lol, but its not =( Sorta sounds like dropping missiles in cartoons! Loudest when driving and coming to a complete stop. But as said the noise goes away a few minutes after temp gauge has reached NORMAL (engine gets to operating temp, noise stays for a few minutes then goes away)

 

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Posted: Fri May 23, 2008 5:55 pm 
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maybe the autobox?
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Posted: Fri May 23, 2008 5:56 pm 
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try other end of map sensor line..... might be loose

the other end i refer to is were it meets the manifold

 

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Posted: Fri May 23, 2008 6:06 pm 
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IAC might be loose?
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Posted: Fri May 23, 2008 6:16 pm 
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My BA has a whistling noise too.

 

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Posted: Fri May 23, 2008 6:57 pm 
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have you been able to diagnose if its bottom end or top end? top end and whistling? or top end and screaming? like metal on metal?

Bottom end, bearing?
If your box is shiftkitted, maybe its flogged and slipping when cold and howling?
Its a serpentine belt setup, so its not a belt slipping, PERHAPS, its idle tension tension bearings ion the serpentine setup? I have heard these whistle when the bearings are destroyed.

If its a mechanical whistle noise that goes away when warm, I would be looking at things supplied with oil.

 

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Posted: Fri May 23, 2008 8:11 pm 
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I had the same prob in our AU but it turned out to be the intake mainfold gasket was half gone, letting lots of air in, really loud noise but I could not find the area it was comming from. turns out it was just under cyl one.

I dont know if your motors are the same but take a look at your gaskets.

Cheers, good luck
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Posted: Fri May 23, 2008 8:32 pm 
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yeah i've got that same problem but mine sounds like a supercharger
i've found the corse its the exhaust and its not a problem at all

 

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