I suspect that it is the operation of a viscous fan hub. Check this by placing your finger on a blade and seeing if you can spin the fan with the engine stopped. It operates when the engine is started and pumps silicone fluid from one side to the other inside the hub and when it has done so the fan slows down in relation to engine speed . Hence the fan noise on starting and then after a short period the fan noise goes away. It will start to operate again when the engine temperature starts to rise when you are stopped at lights or idling for a while to draw air through the radiator to cool the coolant and when you start moving and air is passing through the radiator again it will slow down. If you experience engine overheating while idling have it replaced as it is not pulling enough air through the radiator to do the job
SOURCE: daewoo cielo 1997 spluttering @ startup
Try to reset the IAC valve on the throttle body it has 4 wires t it .
procedure is as follows
turn ignition key on (don't start the engine), unplug the IAC valve, turn the key off, replug the IAC .Do this 3-4 times .Then start the engine while holding the pedal down at about 2000 rpm then let the rpm down slowly till idle. Sometimes the throttle requires cleaning then redo the reset.
SOURCE: 2001 checy Tahoe wont stay running for more then 10 seconds?
If its been a while sense you have chg. fuel filter,DO IT, If still does the same after that, do fuel pressure test, fuel pump might be on its way out. $$$$$. If pump and filter chks. out ok, than maybe its fuel regulator. My best guess its either filter or pump.
SOURCE: engine starts, runs (3 sec.), dies
Sounds like your immobilizer is activating. Try another key or you need to take it to a vw dealer for diag and adaptation.
SOURCE: Cobalt not running at low rpm.......
All are possibilities but EGR valve makes the most sense. It's famous for causing poor idling and/or stalling at low RPMS. Best of luck.
Greg
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