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Car is making a noise everytime I hit the gas...

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Old 06-07-2005, 09:07 AM   #1
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Default Car is making a noise everytime I hit the gas...

First off, my apologies for contributing nothing but questions to the forum but I'm a new Audi dude and don't know jack about these things.

As for my 99 A6 2.8, if you can imagine the sound of someone sharpening a sword on a grinding stone, that's kind of like the sound it's making...or similar to dragging a metal can on the ground. Hard to explain, but it only happens when I give it gas, never when idling. Anyone experience this? No performance lags or anything, just a loud noise whenever I gas it.

Also, whenever I start the car after not driving it for 6 or more hours, there's a really loud fan that runs for a minute or two...it would seem to be like an "accelerated warmup" thing as I bought it in the winter, but at 70 degrees I don't know why it would do this...is it normal?
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Old 06-07-2005, 09:15 AM   #2
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Default Maybe the exhaust rubbing on something... As for the startup fan...

that's the secondary air pump, which is an emissions thing. The inlet pipe may have come undone, which is why you can hear it so loudly.
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Old 06-07-2005, 09:15 AM   #3
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Default The fan noise is due to the auxillary air pump to reduce emissions during startup.

How many miles on the car? Is it a Front Trak or Quattro? Got old service records?
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Old 06-07-2005, 09:22 AM   #4
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Default Specifics: In gear or neutral? Does it change...

with engine speed? Could be an idler pully?
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Old 06-07-2005, 09:28 AM   #5
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Default Re: Specifics: In gear or neutral? Does it change...

Only in gear, I can rev the engine in neutral and won't hear it...
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Old 06-07-2005, 09:32 AM   #6
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Default Re: The fan noise is due to the auxillary air pump to reduce emissions during startup.

56K miles, Quattro, and unfortunately I don't have any old service recs...

So this fan noise is normal? Just seems weird, I'm hesitant to drive it until the fan calms down, though it really doesn't feel very different driving it while that aux. fan is still running...
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Old 06-07-2005, 09:54 AM   #7
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Default Scraping noise...is it only when you give it gas from a stop?

if so, I might suggest you check your rotor shields, which are metal. The sheild is on the inboard side of the rotor, and sometimes warps and scrapes against the rotors. Easy solution, just reach in there and bend it back so it does not hit the rotor. Just be careful if you hove just driven the car around a lot, the brakes are HOT!

Just a guess...good luck!
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Old 06-07-2005, 10:00 AM   #8
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Default Nope, anytime I hit the gas, but I will get under there and look

worth a shot, thanks.
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Old 06-07-2005, 10:22 AM   #9
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Default Some fan noise is normal. As the other say, make sure the tube

is connected.

As for the grinding noise, can you tell where it comes from? Front, rear, center? You may have to drive alongside in another car with the windows down to identify the area.

Did it just start suddenly?
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Old 06-07-2005, 11:02 AM   #10
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Default seems like it's gotten worse over the course of a couple months

and it's definitely coming from the front, somewhere around the engine, that's the best i can tell...
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Old 06-07-2005, 05:18 PM   #11
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Default Re: Car is making a noise everytime I hit the gas...

Does it do it while turning and hitting the gas or in a straight line?
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Old 06-07-2005, 07:45 PM   #12
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Default Well, that suggests exhaust sheild, exhaust itself, one of the accessory drives or idlers, etc.

Have you checked fan clearance?
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Old 06-07-2005, 09:49 PM   #13
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Default Could it be something in the clutch? I sometime have a similar metal on metal friction noise when

I accelerate. It only does it when the acceleration is done under load (doesn't do it at idle with no speed engaged).
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Old 06-08-2005, 04:09 AM   #14
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That sounds just like what I got goin, no idle noise at all
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Old 06-08-2005, 04:11 AM   #15
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Default Alright thank you so much for your help, that doesn't sound

like it will be too bad to fix. Going to look into it, but thanks again.
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Old 06-08-2005, 04:30 AM   #16
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Default Probably not.. most clutch noises happen regarless of load...

most drivetrain noises happen with light load...
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Old 06-08-2005, 03:33 PM   #17
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Well, if it makes the sound only under load, it's most likely exhaust or driveline.
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Old 06-08-2005, 08:14 PM   #18
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Default I got that confirmed by my Audi tech yesterday too. Kris and April are the best :-) Tech said it's

probably the exhaust shield or some other metal exhaust part that vibrates at certain engine revolution rates.

Tks Kris
Tks April
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