: Quick question about a noise



codewize
12-08-06, 10:49 PM
This is the first really cold season I've had the DTS. When it's cold out say below 30, and I start the card there a very high pitch whine from the driver side front. Sounds exactly like a super charger. Then it goes away as soon as the car warms up a little.

Should I worry about this?

Ranger
12-08-06, 10:57 PM
In the cabin? Asperator fan. Under the hood? Water pump tensioner bearing from the location you gave would be my guess.

codewize
12-08-06, 11:17 PM
Oh sorry, yes outside the car is where I hear it.

It sounds like a bearing noise, sort of, but it sounds like a bearing spinning very very fast or much faster than I would expect to hear at idle. You ever take like a small electric motor and put to much voltage to it? That's what it sounds like. Like an AFX car or something.

I'll take a close listen under the hood tomorrow morning if I remember.

dp102288
12-09-06, 07:40 AM
Our SLS does the exact same thing. But I think there is a How To that says it is the cabin fan or something. Doesn't bother any of us because it does go away in a minute or two.

I like to think GM stuck a secret supercharger in there somewhere...:p

codewize
12-09-06, 05:42 PM
Wasn't cold enough this morning and now we're supposed to get a heat wave or something.

fristim
12-10-06, 07:13 PM
Does it sound like a hydraulic whine.

dp102288
12-10-06, 08:57 PM
^^ I don't think so. Ours sounds like a small fan spinning really fast.

codewize
12-10-06, 10:06 PM
dp102288 is correct. I can tell by his reaction that he hears the same thing I do.

It sounds like a small bearing spinning very very fast, just like a small AFX car. You ever hold one of those while you gun it? That's what it sounds like. It's smooth and consistent. If it is a bearing I would expect it to be spinning at like 20,000 RPM like a Dremel Tool, yeah that's what it sounds like.

dp102288
12-11-06, 08:22 PM
20,000 rpm dremel! EXACTLY! :thumbsup:

codewize
12-11-06, 09:51 PM
Ok great. We have two people that definitely have the same noise.

I do want to verify that yours is only does it in the very cold. The other day it was 30 and that wasn't cold enough for mine to do it.

Now what the hell is the noise?

dp102288
12-12-06, 11:11 AM
^^ Mine only does it in the cold...very cold.

I think I am a little lost though...the sound I hear, the dremel sound, I hear from the inside of the car. Yours is from the hood area?

Let me clarify...from the inside I get the dremel, from the engine area I get the whining/supercharger sound. Dremel is only in very cold, supercharger is 97% of the time, any weather.

Sorry if I confused you. So your getting a dremel from the hood area?

codewize
12-12-06, 01:32 PM
No I think we're hearing the same thing. I originally heard it inside the car when I started it then got out to listen. It's on the drivers side from what I can tell but I'm sure we're hearing the same thing.

TripleblackETC
12-12-06, 02:07 PM
I get the hydraulic whining noise in the very very cold, but I'm thinking it's coming from the water pump since it's loudest in that area. I've never heard the noise you two are talking about though.

dp102288
12-12-06, 07:07 PM
No I think we're hearing the same thing. I originally heard it inside the car when I started it then got out to listen. It's on the drivers side from what I can tell but I'm sure we're hearing the same thing.

The dremel right?

I have never been outside the car when I hear it on the inside. Next time I do hear it though I will try to hear if it is louder by the engine.

codewize
12-18-06, 12:00 AM
We think this sound has been identified.

Read more here
http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/93222-pcm-p0410-secondary-air-injection-system-2.html#post907060

dp102288
12-18-06, 11:36 AM
^^ yeah I responded to the sounds in that thread.