Intermittent Noise on 2000 A6 2.7T
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Intermittent Noise on 2000 A6 2.7T
I have a 2000 Audi A6 2.7T (twin-turbo)
I am having an intermittent noise that I have not been able to diagnose or get repaired. Here is a description, it is a little strange
1. The noise is very much like a fan vibration mostly like the blades of a fan are clicking against some obstruction or the fans are clicking against the fan housing or frame. It's not exactly like that but close. There can be a little bit of a "flutter" to the sound sometimes and it can vary in intensity and volume level
2. It does not proportionally scale with engine RPM. It does go up a bit, but not in a direct relation which is why I initially thought it was the cooling fan (may still be)
3. It is very intermittent, and there is no direct causal event that triggers it. The noise can occur every day for a while, then not happen again for a week sometimes 2.
4. When it happens it always goes away at some point. When it goes away the engine sounds perfect and it drives excellently at all times. One very slight exception to this is that there does every once in a while seem to be just an extra little titch of turbo lag
5. It can go away in several ways:
A. High RPMS at idle will often clear it (i discovered this the first time to a repair shop
B. Sometimes it will go away all by itself in normal driving but not often
C. 100% of the time, if it is making the sound still when I stop and I leave the car off for an hour or more, sometimes less it will go away
6. When the sound goes away from a cold restart it is a little different than the other ways it goes away. When I first start the car (it starts great) it makes the same sound but noticeably louder and with a slight rattling element. However, 100% of the time the sound goes away within 15-20 secs.
7. I HAVE taken it to two good mechanics. Both mechanics initially thought that it was "fan related", but as in 6 above when they turn the engine on later the sound goes away and they are not able to make it occur again while they have the car in their shop.
So I was wondering if anyone has any thoughts on what it could be or maybe have seen this before and know what it is. It has been like this for probably 6K miles.
It does not burn any oil and oil level is correct, and does not overheat or get hotter per the gages when making the noise. Outside of the noise the car runs great. It is also a new engine put in around 12K miles ago when the previous engine threw a rod, and this engine had 45K on it. The water pump and timing belt were replaced new as part of the engine replacement.
Look forward to hearing some thoughts.
I am having an intermittent noise that I have not been able to diagnose or get repaired. Here is a description, it is a little strange
1. The noise is very much like a fan vibration mostly like the blades of a fan are clicking against some obstruction or the fans are clicking against the fan housing or frame. It's not exactly like that but close. There can be a little bit of a "flutter" to the sound sometimes and it can vary in intensity and volume level
2. It does not proportionally scale with engine RPM. It does go up a bit, but not in a direct relation which is why I initially thought it was the cooling fan (may still be)
3. It is very intermittent, and there is no direct causal event that triggers it. The noise can occur every day for a while, then not happen again for a week sometimes 2.
4. When it happens it always goes away at some point. When it goes away the engine sounds perfect and it drives excellently at all times. One very slight exception to this is that there does every once in a while seem to be just an extra little titch of turbo lag
5. It can go away in several ways:
A. High RPMS at idle will often clear it (i discovered this the first time to a repair shop
B. Sometimes it will go away all by itself in normal driving but not often
C. 100% of the time, if it is making the sound still when I stop and I leave the car off for an hour or more, sometimes less it will go away
6. When the sound goes away from a cold restart it is a little different than the other ways it goes away. When I first start the car (it starts great) it makes the same sound but noticeably louder and with a slight rattling element. However, 100% of the time the sound goes away within 15-20 secs.
7. I HAVE taken it to two good mechanics. Both mechanics initially thought that it was "fan related", but as in 6 above when they turn the engine on later the sound goes away and they are not able to make it occur again while they have the car in their shop.
So I was wondering if anyone has any thoughts on what it could be or maybe have seen this before and know what it is. It has been like this for probably 6K miles.
It does not burn any oil and oil level is correct, and does not overheat or get hotter per the gages when making the noise. Outside of the noise the car runs great. It is also a new engine put in around 12K miles ago when the previous engine threw a rod, and this engine had 45K on it. The water pump and timing belt were replaced new as part of the engine replacement.
Look forward to hearing some thoughts.
Member
Joined: Feb 2009
Posts: 31
I think there is a way to post audio on the forums. I don't know how. Not much help here. My first thoughts were the belt assembly. Checked for any foreign objects in the fan or radiator areas? Try to narrow it down by vehicle conditions: AC running, engine coolant and oil temps., etc. If you really think it's affecting turbo lag, try checking the induction system hoses. Good luck
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