Camry :: Engine Making Whistle / Squeal Sound When Revving


Jan 14, 2014

My brother and I noticed my engine making this noise today, I was under the hood and he was giving the engine gas with the car in neutral.

video of sound: [URL] .....

Sounds like air pressure being released, sort of a quick whistle or squeal just as he pushes the gas pedal, coming from under the hood somewhere.

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[URL] ....

I have a whistle sound mostly upon decel when the engine was cold. I have the APR down pipe installed. Today it's doing it all the time even when warm. I took the car to the dealer and they said it was prolly an exhaust leak. I took the car to my friends shop and we put the car up on the lift and listened from underneath. It sounded like the turbo was echoing in the down pipe. Sometimes when it's cold it can be very loud. So my question is if this is normal with the APR down pipe or with this turbo or is this a sign that I have a turbo failure coming?

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Are they known to cause any noise? VGT Solenoid.

I have recently developed a slight whistle/squeal when boosting and when letting off on the pedal. I initially thought I had a CAC boot starting to split out, but since it's making the noise when I let off as well I doubt that the problem.

It isn't constant, and only does it for a second or two when it happens. It's not extremely loud, just loud enough to make you wonder what the heck it is...

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I am due for an inspection for a 2004 Camry (4 cyl.).

I had the engine light come on with a P2231 or P2238 code on my OBDII tool. Car was running fine, no weirdness whatsoever. But I went ahead and changed the front sensor (Bank 1 Sensor 1). As soon as I changed the code went away and it is not coming out anymore, nor are other codes.

However, the engine doesn't idle after 5 minutes running. I have to keep revving it up at the light to keep going. I shut it off and it turns on no problem. But then it doesn't idle. What a pain, I used the Bosch O2 sensor bought from AutoZone.

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I think the sound is originating on the left portion of the engine, somewhere between the oil cap and the timing cover.

Any good ways to test the vacuum lines or gaskets?

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I then pulled the car over, it seemed to go dead, then the car did crank back up, the engine sounded much louder, like a loud rev/hum, not quiet like usual.

I next drove a mile to a c-store, transmission seemed OK, no leaks, did see a check engine light briefly, but it disappeared. Car cranked OK, headed home, same sound right at cranking and at moderate speed.

Finally, I jacked the car up on the front left, from research appears that the plastic engine shields got smacked good along the front and near the right tire and bent back quite a bit on the left side. There seems to be no other structural damage that my untrained eye could see, just one indention you'll see in a couple of the photos that I think is part of the car design at that spot.

Again, no leaks, no smoke, no caution lights of any kind now.

Photos are attached...

My Hyundai's engine now sounds like a Mustang! Hoping it's just the engine noise from these plastic covers now being bent/destroyed in some spots, exposing the engine and the typical noise you'd hear without them...

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Earlier today on a easy drive (not pushing it) I noticed a slight "whistle-sound" that I haven't noticed before. About then it became VERY sluggish and the Engine Management Light started to flash.

As soon as I could I pulled over and connected my AL619 and it says "to low turbo/supercharger flow".

I didn't notice any smoke or smell, just a serious lack of power (i was doing 30km/h at the top of the hill).

Just tried to locate the leak, but I cant feel it or see it. I guess one would need one of those "smoke generators" to see where the pressure goes out.

So, do I have a broken turbo, or just a blown turbo pipe/tube?

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