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Old 11-25-2008, 09:57 AM   #1
biggitybakes
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Member#: 143940
Join Date: Mar 2007
Chapter/Region: MWSOC
Location: KY
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2016 WRX
LBP

Default Help please. Intermittent engine bay noise.

Ok, so about a month ago my car started making a hollow rattling noise. Refer to avi video below.

About my car: 2004 wrx with cobb catted turbo back exhaust and cobb 93 octane stage 2 flash. 93k miles. Original clutch and transmission. Oil level was checked and is within range. Drives normal.

The noise: http://www.savefile.com/files/1903578 This is a video of me revving the engine a couple of times after driving to work (12miles). As you can see it is not consistent, and the noise is most evident on the first rev. You can hear it slightly on the 2nd and 4th rev. However, the 3rd higher rev does not exhibit the noise.

About the noise: It is intermittent. It is most evident on cold start ups. It seems once the car is warmed up that the noise becomes progressively less frequent. It can happen in gear and out of gear, with the clutch in and the clutch out. It can happen while the clutch is engaging. It can happen when I am stopped in neutral and reving the engine. I can not get the noise while driving in gear.

Also, I have tried reving the car from the engine bay and I can not hear the noise at all. I can only hear it when I am in the cabin. It seems to happen at certain rpm while reving i.e. below 3k and if I do a slow but steady rise in rpm you can hear sporadic brief moments of the noise.

I can drive my car normally. I can even do a full pull and the noise will not happen except for the initial clutch engagement in first gear while the rpms are below 3k.

I have brought my car to a subaru dealership twice and I can not get the noise to happen for a tech. On my second visit I parked my car in the parking lot, reved it and the noise happened. Left the engine running walked in, grabbed a tech and within 2 minutes he came out and the noise would not happen!!!!

Any help would be much appreciated.

Thanks!
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Old 11-25-2008, 11:41 AM   #2
Sir-Knight
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Member#: 73636
Join Date: Nov 2004
Chapter/Region: E. Canada
Location: the 'wa, ontario, canada
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2007 Impreza 2.5i SE
newport blue pearl

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can't really hear anything in the video... get your car up on jackstands and check all the exhaust heatshields, open up the hood, check the turbo heatshield.. when the car is cold, under the car, grab the midpipe and give it a tug to see if you hear anything... I had a noise that sounded like a rotary scraping noise on startup until I was under the car.. turns out the springbolts on the exhaust needed to be greased.
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Old 11-25-2008, 03:09 PM   #3
biggitybakes
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yeah sorry about the quality of the video, you have to really crank the volume up to hear it. Yeah, I was wondering if it was something exhaust related because it doesn't seem to be transmission related because it happens in and out of gear and clutch in and out. Also, I have stuck my head in the engine bay every angle I could and I couldnt hear it, with close attention to the turbo area. I'll try and get it on jacks and see if I can hear it underneath.

Thanks for your reply.
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Old 11-25-2008, 03:10 PM   #4
biggitybakes
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btw, rotary scraping noise is a good description of the sound I hear.
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Old 11-25-2008, 04:33 PM   #5
Sir-Knight
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newport blue pearl

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my noise I would hear only when I would take off from a stop in 1st or 2nd, I tried 2nd to make sure it wasn't an issue with first. It sounded like it was coming from the engine bay, center of the car or to the right. It would go away once the car was warmed up and driven for about 15 minutes.

I bought a can of white grease and hit any sort of rubber bushing or rubber/rubber or rubber/metal connection to make sure I got it. I'm pretty sure it was the exhaust bolts tho, since as soon as I grabbed it, the sound was quite nasty.
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Old 11-25-2008, 07:08 PM   #6
biggitybakes
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Did the sound happen when in neutral and just free reving the engine?
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Old 11-26-2008, 08:46 AM   #7
Sir-Knight
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Location: the 'wa, ontario, canada
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2007 Impreza 2.5i SE
newport blue pearl

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I usually don't free rev the engine, which was one of the only things I didn't try when diagnosing it now that I think about it, but the exhaust would probably flex a little all the same. In your case it could be more heatshield, but the exhaust is probably a good place to start, just have a can of grease with you under there and bang/push/pull around under the car to find it.

On stands of course... wouldn't want you under the car with just the jack
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Old 11-26-2008, 11:23 AM   #8
biggitybakes
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LBP

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ok thanks man, I'll check it out.
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