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Discussion Starter · #1 · (Edited)
Hi everyone,

I had a strange noise comming from the passenger side of the engine compartement since day 1 (two days ago). I first noticed it when going up a small hill and the engine rmp started increasing above 2000 rpm. This is a 1.4L with A/T.

I assumed it is a normal noise for a brand new engine, but today I drove the car for the second time and tested it a little more. If I accelerate slowly, after about 1800 rpm and right before each gear change I hear a sound as if I had a broken muffler (low pitch, contantly repeating, ) and I can feel the car resonate just a little to that sound. Right after each gear change it goes away.

While crusing at 55mph, the sound is not as loud but it is constantly there, a constant brrrrrr. Rpm moves from 2100 to 2300 or so every 30 seconds while cruising at 55 mph. On my 2011 I could barely hear the engine, but on this one this "air intake noise" is a little louder than the engine. I don't hear the blow off valve after the gear change, I know what that sounds like.

I can also feel something is not steady in the throttle pedal and my rear passengers could also feel a slight vibration in the seat, also related to the same sound.

One other thing: at 45-50 mph my 2011 was taking below 6L/100km while the instantaneous fuel consumption now shows at least 8L/100km and 5 clicks on the + of the cruise control will show >12L/100km. Now even a close to my 2011.

It sounds a little like this from second 5 to 15: 2003 Acura TL-S ATLP Exhaust (Intake Resonator Removed) - YouTube but sounds more like a broken pipe sound and less high pitch.

If I accelerate and take my foot off the throttle, it behaves normally (doesn't slow down abnormaly, doesn't make any sound, doesn't feel jerky).

Other than that, it drives beautifully and the engine is responsive. Nothing to report on downshifts.

I would like you advice on whether I should drive the car or way for my dealer to return after new years (next thursday). What concerns me is that the car was driven from another dealer to my dealer for about 120 miles... and whoever drove it did not hear anything? I hope I won't have future problems just because it's got a defect and it was driven like this for that long.

My car is stock but it sounds a little like this one only when going above 1800 rpm. At minute 1:14 I get a very similar sound and that's when the chassis vibrates http://www.youtube.com/watch?v=TF9sZZHSisE

Thank you in advance for any advice!
 

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Are you sure that's not just the turbo you're hearing? It does spool up fully by 1800 RPM.

Eyeball the engine compartment, and wiggle the air filter housing and intake tubing you can reach. If any of it's loose, grab a screwdriver and tighten it back down.
 

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Discussion Starter · #3 ·
I was thinking I did not have an air filter :) or that something was wrong with its housing. I opened it up and put it back, no fault found.

I am pretty sure it is not the turbo. Why would it be making such a noise?
 

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If it's a hissing/sucking sound that is really audible over 1800 RPM, that's the turbo. Also, at 1:14 in the second video sounds exactly like my Cruze that has a resonator delete. That's the bypass valve bypassing extra boost after a downshift.

Is there a way for you to make a video so we can be sure we're hearing what you're hearing?
 

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Discussion Starter · #5 · (Edited)
It is not a hissing/sucking sound. It sounds more like a performance exhaust but somewhere near the air intake.

I will try to record the sound tomorrow. While accelerating at idle I could not duplicate it.
 

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I finally got a chance to listen to that. I've not heard that noise out of my Cruze. It almost sounds like old-school ABS activating or going over a patch of very rough road. There's not much in that area aside from the intake resonators that would cause that noise. It almost sounds like a wheel bearing, except that would be constantly noisy.

Feel that wheel after a long drive, and compare it to the other front wheel. It should be the same temperature. If it's not, take it to the dealer and have them take a look at the brakes or wheel hub.

Does the traction control light flicker when it's doing that noise?
 

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Discussion Starter · #8 ·
Thank you for your suggestion. I will keep in mind to feel the temperature of both front wheels. What makes me think it is related to the engine/intake/exhaust is that it vibrates only above 1800 and when it is cold it becomes very obvious.
 

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I've been batting at 0% so far with this one.

The other idea I could have is something to do with the turbo like the wastegate opening early. That would cause the sound to appear on the passenger side, although I have no idea what that would sound like.
 

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Discussion Starter · #10 ·
I believe it is not related to the turbo/westgate because that would not cause a vibration within the chassis but I might be wrong. I am going to the dealer tomorrow and hope they can reproduce that noise.
 

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I believe it is not related to the turbo/westgate because that would not cause a vibration within the chassis but I might be wrong. I am going to the dealer tomorrow and hope they can reproduce that noise.


gt_cristian,
I would like you to keep me posted on the progress with your dealer. If you have any questions please feel free to contact me anytime.
Thank you,
Stacy Chevrolet Customer Service
 
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