Dano58 wrote:
> On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
> wrote:
>
>> "TonyJ" <to...@visi.com> wrote in message
>>
>> news:13lpg6soek5a218@corp.supernews.com...
>>
>>
>>
>>
>>> check the meaning wrote:
>>>
>>>> Hi,
>>>> My A4 2k has started making a grating noise from about where the exhaust
>>>> cat is situated, the noise is only present when i start from cold, the
>>>> noise dissapears after about 2 mins, any ideas??
>>>> Thanks.
>>>>
>>> Need more information:
>>> What engine / transmission?
>>> Does it make the sound when moving and in gear?
>>> Does it vary with engine speed?
>>> Noise when brading?
>>> What speeds does it seem worse?
>>> Any error codes?
>>>
>> Sorry for lack of info......
>> Its a 1.8 se manual, the noise is only there at start up from cold,
>> dissapears after
>> a couple of mins driving, there is no noise after that, drives well, no
>> noise when braking or anything else, only at start up. Sounds like a
>> "rattling / grating" noise. then dissapears when engine warmed up. also no
>> error codes. HTH.
>>
>
> Could be the heat sheild rattling until it warms up and expands a bit.
> Could also be the insides of the cat doing the same - rattling until
> it expands. The heat sheild is easy to check, just see if it moves
> around when cold. If it is the inside of the cat coming apart, I would
> assume that you'll see a Check Engine Light soon, as it will clog the
> exhaust system.
>
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
>
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to
disengage from the flywheel. If it is this it would be very loud until
it disengaged and probably reving the engine a bit would force it to
quit suddenly.

 

Dano58 wrote:
> On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
> wrote:
>
>> "TonyJ" <to...@visi.com> wrote in message
>>
>> news:13lpg6soek5a218@corp.supernews.com...
>>
>>
>>
>>
>>> check the meaning wrote:
>>>
>>>> Hi,
>>>> My A4 2k has started making a grating noise from about where the exhaust
>>>> cat is situated, the noise is only present when i start from cold, the
>>>> noise dissapears after about 2 mins, any ideas??
>>>> Thanks.
>>>>
>>> Need more information:
>>> What engine / transmission?
>>> Does it make the sound when moving and in gear?
>>> Does it vary with engine speed?
>>> Noise when brading?
>>> What speeds does it seem worse?
>>> Any error codes?
>>>
>> Sorry for lack of info......
>> Its a 1.8 se manual, the noise is only there at start up from cold,
>> dissapears after
>> a couple of mins driving, there is no noise after that, drives well, no
>> noise when braking or anything else, only at start up. Sounds like a
>> "rattling / grating" noise. then dissapears when engine warmed up. also no
>> error codes. HTH.
>>
>
> Could be the heat sheild rattling until it warms up and expands a bit.
> Could also be the insides of the cat doing the same - rattling until
> it expands. The heat sheild is easy to check, just see if it moves
> around when cold. If it is the inside of the cat coming apart, I would
> assume that you'll see a Check Engine Light soon, as it will clog the
> exhaust system.
>
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
>
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to
disengage from the flywheel. If it is this it would be very loud until
it disengaged and probably reving the engine a bit would force it to
quit suddenly.

 

Dano58 wrote:
> On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
> wrote:
>
>> "TonyJ" <to...@visi.com> wrote in message
>>
>> news:13lpg6soek5a218@corp.supernews.com...
>>
>>
>>
>>
>>> check the meaning wrote:
>>>
>>>> Hi,
>>>> My A4 2k has started making a grating noise from about where the exhaust
>>>> cat is situated, the noise is only present when i start from cold, the
>>>> noise dissapears after about 2 mins, any ideas??
>>>> Thanks.
>>>>
>>> Need more information:
>>> What engine / transmission?
>>> Does it make the sound when moving and in gear?
>>> Does it vary with engine speed?
>>> Noise when brading?
>>> What speeds does it seem worse?
>>> Any error codes?
>>>
>> Sorry for lack of info......
>> Its a 1.8 se manual, the noise is only there at start up from cold,
>> dissapears after
>> a couple of mins driving, there is no noise after that, drives well, no
>> noise when braking or anything else, only at start up. Sounds like a
>> "rattling / grating" noise. then dissapears when engine warmed up. also no
>> error codes. HTH.
>>
>
> Could be the heat sheild rattling until it warms up and expands a bit.
> Could also be the insides of the cat doing the same - rattling until
> it expands. The heat sheild is easy to check, just see if it moves
> around when cold. If it is the inside of the cat coming apart, I would
> assume that you'll see a Check Engine Light soon, as it will clog the
> exhaust system.
>
> Dan D
> '04 A4 1.8Tq MT-6
> Central NJ USA
>
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to
disengage from the flywheel. If it is this it would be very loud until
it disengaged and probably reving the engine a bit would force it to
quit suddenly.

 

"TonyJ" <tonyj@visi.com> wrote in message news:13lr2b02sjp88f8@corp.supernews.com...


Dano58 wrote:
On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
wrote:
"TonyJ" <to...@visi.com> wrote in message

news:13lpg6soek5a218@corp.supernews.com...



check the meaning wrote:
Hi,
My A4 2k has started making a grating noise from about where the exhaust
cat is situated, the noise is only present when i start from cold, the
noise dissapears after about 2 mins, any ideas??
Thanks.
Need more information:
What engine / transmission?
Does it make the sound when moving and in gear?
Does it vary with engine speed?
Noise when brading?
What speeds does it seem worse?
Any error codes?
Sorry for lack of info......
Its a 1.8 se manual, the noise is only there at start up from cold,
dissapears after
a couple of mins driving, there is no noise after that, drives well, no
noise when braking or anything else, only at start up. Sounds like a
"rattling / grating" noise. then dissapears when engine warmed up. also no
error codes. HTH.

Could be the heat sheild rattling until it warms up and expands a bit.
Could also be the insides of the cat doing the same - rattling until
it expands. The heat sheild is easy to check, just see if it moves
around when cold. If it is the inside of the cat coming apart, I would
assume that you'll see a Check Engine Light soon, as it will clog the
exhaust system.

Dan D
'04 A4 1.8Tq MT-6
Central NJ USA
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to disengage from the flywheel. If it is this it would be very loud until it disengaged and probably reving the engine a bit would force it to quit suddenly.

Cheers guys, I think danos diagnosis is more close to the mark, i will check it out
many thanks for your replies........ :0) Ps did you know that you are posting in HTML ??

 

"TonyJ" <tonyj@visi.com> wrote in message news:13lr2b02sjp88f8@corp.supernews.com...


Dano58 wrote:
On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
wrote:
"TonyJ" <to...@visi.com> wrote in message

news:13lpg6soek5a218@corp.supernews.com...



check the meaning wrote:
Hi,
My A4 2k has started making a grating noise from about where the exhaust
cat is situated, the noise is only present when i start from cold, the
noise dissapears after about 2 mins, any ideas??
Thanks.
Need more information:
What engine / transmission?
Does it make the sound when moving and in gear?
Does it vary with engine speed?
Noise when brading?
What speeds does it seem worse?
Any error codes?
Sorry for lack of info......
Its a 1.8 se manual, the noise is only there at start up from cold,
dissapears after
a couple of mins driving, there is no noise after that, drives well, no
noise when braking or anything else, only at start up. Sounds like a
"rattling / grating" noise. then dissapears when engine warmed up. also no
error codes. HTH.

Could be the heat sheild rattling until it warms up and expands a bit.
Could also be the insides of the cat doing the same - rattling until
it expands. The heat sheild is easy to check, just see if it moves
around when cold. If it is the inside of the cat coming apart, I would
assume that you'll see a Check Engine Light soon, as it will clog the
exhaust system.

Dan D
'04 A4 1.8Tq MT-6
Central NJ USA
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to disengage from the flywheel. If it is this it would be very loud until it disengaged and probably reving the engine a bit would force it to quit suddenly.

Cheers guys, I think danos diagnosis is more close to the mark, i will check it out
many thanks for your replies........ :0) Ps did you know that you are posting in HTML ??

 

"TonyJ" <tonyj@visi.com> wrote in message news:13lr2b02sjp88f8@corp.supernews.com...


Dano58 wrote:
On Dec 10, 3:50 am, "check the meaning" <humancondit...@nowhere.com>
wrote:
"TonyJ" <to...@visi.com> wrote in message

news:13lpg6soek5a218@corp.supernews.com...



check the meaning wrote:
Hi,
My A4 2k has started making a grating noise from about where the exhaust
cat is situated, the noise is only present when i start from cold, the
noise dissapears after about 2 mins, any ideas??
Thanks.
Need more information:
What engine / transmission?
Does it make the sound when moving and in gear?
Does it vary with engine speed?
Noise when brading?
What speeds does it seem worse?
Any error codes?
Sorry for lack of info......
Its a 1.8 se manual, the noise is only there at start up from cold,
dissapears after
a couple of mins driving, there is no noise after that, drives well, no
noise when braking or anything else, only at start up. Sounds like a
"rattling / grating" noise. then dissapears when engine warmed up. also no
error codes. HTH.

Could be the heat sheild rattling until it warms up and expands a bit.
Could also be the insides of the cat doing the same - rattling until
it expands. The heat sheild is easy to check, just see if it moves
around when cold. If it is the inside of the cat coming apart, I would
assume that you'll see a Check Engine Light soon, as it will clog the
exhaust system.

Dan D
'04 A4 1.8Tq MT-6
Central NJ USA
Dan's reply is probably the best guess but I have one other idea.

It could be the starter bendix sticking and not allowing the starter to disengage from the flywheel. If it is this it would be very loud until it disengaged and probably reving the engine a bit would force it to quit suddenly.

Cheers guys, I think danos diagnosis is more close to the mark, i will check it out
many thanks for your replies........ :0) Ps did you know that you are posting in HTML ??

 

The secondary air pump will only run for the first 30 to 120 seconds
when the car is first started. The ECT will tell the ECM how long to
keep the pump on. The pump is low on the car and I have seen water get
in the pump and eventually cause the motor to get louder becasue the
bearings dry out. Start the car (do not drive) and go up front and
listen to the fan. If the noise goes away when the fan stops than the
fan needs replacing. VW has a similar problem and when water gets in
the (colder climate) the pump will freeze and blow the fuse.



On Sun, 09 Dec 2007 23:51:42 GMT, "check the meaning"
<humancondition@nowhere.com> wrote:

>Hi,
>My A4 2k has started making a grating noise from about where the exhaust
>cat is situated, the noise is only present when i start from cold, the noise
>dissapears after about 2 mins, any ideas??
>Thanks.