Whistling sound from engine, what could it be?? - Honda Prelude Forum

99_SH · 06-22-2002, 03:43 PM

There's this strange whistling sound comming from my engine that I've yet to figure out. When the car is sitting idle, everything sounds normal. Then when I tap the gas, and the rpms pass just above 700, there's this small whistle sound that comes for a split second then dissappears. If I lightly keep the gas pedal at around 700rpms I could make a constant whistle sound. It sounds like as if someone is whistling.

I was thinking maybe its a loose vacuum hose connection on the intake manifold thats causing air to come in and make the sound, but I haven't had the chance to go and look.

cowboijeff · 06-22-2002, 03:45 PM

do you have an aftermarket intake, if so it could be the filter. One you go fast enough the road/engine noise covers it up....just a thought

JoeW · 06-22-2002, 03:53 PM

Like you said, its probably a loose vacuum line. I'd check those first

NtPReLuDe · 06-22-2002, 06:27 PM

you got a turbo that you didn't know about

JRSClude · 06-22-2002, 06:31 PM

perhaps a belt is loose and/or slipping?? spray some belt dressing on the inside of the belt and if that stops it, then there you go. or get a new belt.

djinferno · 06-22-2002, 06:49 PM

no my friend, thats your tentionner going, happend to me last week, sounds like you have a supercharger without the power

azninside · 06-22-2002, 09:48 PM

how do you check the belt tensioner? what is it? an where is it? is it in the helms manual?

-AZNinside

GaRn · 06-22-2002, 10:31 PM

a turbo makes a whistle sound, supercharger makes a whining sound, lol, but who cares?

99_SH · 06-23-2002, 12:36 PM

I hope its not the tensioner, I thought a rattling sound is the tensioner.

I checked yesterday, and I couldn't find anything loose, I didnt even hear the whistling sound when I was under the hood, strange. Oh well, I'm sure its nothing big, its prolly the intake making wierd sounds.

flybyeludegettingirls · 06-23-2002, 03:47 PM

do you have an aftermarket header??? sometimes headers whistle at a certain exhaust frequency.

99_SH · 06-23-2002, 03:54 PM

Ya I have header and intake, but its been years. All these sounds I'm hearing are new.

silverlude2001 · 06-23-2002, 04:44 PM

I have a even weirder situation. I am noticing the same engine whistle but only when I play my MP3 player (hooked up thru a FM Modulator to the factory radio). I am noticing this after I got a Clifford alarm installed in my car. I have a feeling they may have loosened a vaccuum hose like someone suggested. Hope that's it!
Any ideas?

ZDVS1 · 06-23-2002, 04:58 PM

Silver, sounds like you have a ground loop in your wiring. Probably alternator whine being picked up somewhere. If this is just after an alarm install, I'd take it back and have them put an isolator in the alarm ground.

-Scott

01XLude · 06-23-2002, 11:50 PM

my boys car used to always whine too because of a bad grounding wire on his amp.... if you had some electrical work done recently... that might be it......

azninside · 06-23-2002, 11:55 PM

I love the whistling sound from my AEM CAI....too bad it's not a simple answer.

-AZNinside

silverlude2001 · 06-24-2002, 01:03 PM

I kinda like the noise

. Could it cause any probs if I left it as is? Also, why does it not happen when the stock radio is playing? Any ideas? Thanks.