2000 Carrera 2 coupe 6 speed - Noise when starting the engine

[Philip54]

When I start the engine in the morning, I hear a noise from the engine compartment for a few seconds (see attached recording).  The noise seems to come from the driver side.  As the engine warms up, the noise goes away and does not usually return during subsequent starts during the same day.

 

The metallic noise can be heard in the background in the recording.  In the recording it is not as bad as it actually is.

 

Any suggestions on what it could be?

 

Thanks

 

996_2000.wav

[Loren]

You should take the ribbed belt off and run it for a few seconds to see if you can isolate the noise.

With the belt off you eliminate the pulleys, alternator, and power steering.

[FirestarterTR]

When I start the engine in the morning, I hear a noise from the engine compartment for a few seconds (see attached recording).  The noise seems to come from the driver side.  As the engine warms up, the noise goes away and does not usually return during subsequent starts during the same day.

 

The metallic noise can be heard in the background in the recording.  In the recording it is not as bad as it actually is.

 

Any suggestions on what it could be?

 

Thanks

it seems to me a noise of one of the tensioning roller or second possiblity , it may come from the generator

[Ahsai]

If you mean the noise is there for about one minute (not a few seconds) during cold start, that sounds very much like the SAI pump. I can hear the noise there during the whole clip.

[Ahsai]

The way to verify it is just unplug the SAI pump when you hear the noise and see if it goes away. Or use a mechanic's stethoscope to touch the SAI pump housing when you hear the noise.

[Philip54]

The way to verify it is just unplug the SAI pump when you hear the noise and see if it goes away. Or use a mechanic's stethoscope to touch the SAI pump housing when you hear the noise.

 

I checked with a stethoscope, it is the SAI pump.

 

I wonder how longer this pump will last and if it is important to change the pump before it fails to prevent additional damage to the engine.  I have seen replacement pumps (996-605-104-00) advertised on E-bay at various prices.  Are these aftermarket pumps? Does a more recent, more reliable version of the pump exist?  Any help on this will be appreciated. 

 

Many thanks to all that provided troubleshooting input.

[Ahsai]

The pump lasts a long time. Mine has 70k and it's still quiet. You can try to relube the bearing (search for SAI pump DIY here and Rennlist) or just replace it for $230 (new Bosch OEM unit).

[Philip54]

The pump lasts a long time. Mine has 70k and it's still quiet. You can try to relube the bearing (search for SAI pump DIY here and Rennlist) or just replace it for $230 (new Bosch OEM unit).

 

Thanks, Ahsai!

[Ahsai]

This is the updated part for your SAI pump (99660510401)

 

http://www.autohausaz.com/pn/99660510401

 

Also check with warehouse33.com with Rennlist discount here http://rennlist.com/forums/996-forum/912151-strange-sound-on-cold-startup-2.html#post12910872

[Philip54]

This is the updated part for your SAI pump (99660510401)

 

http://www.autohausaz.com/pn/99660510401

 

Also check with warehouse33.com with Rennlist discount here http://rennlist.com/forums/996-forum/912151-strange-sound-on-cold-startup-2.html#post12910872

 

Super.  Thanks, Ahsai.