Idling problem
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Idling problem
I have a 2001 TT225. It has a slow drain on the battery which will kill it if I let it sit for two or so weeks(don't drive the car much recently). Anyways, after i jump start it, it will idle fine for about two minutes. All at once the rpms drop, the tach bottoms out, battery light flickers, then it picks up and is on its way. It does it fairly consistently for about ten minutes. Also whenever it does this, i can hear a whirring noise coming from the alternator. Does anyone have any ideas, or had this happen to you?
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Joined: May 2001
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WAG
I have a 2001 TT225. It has a slow drain on the battery which will kill it if I let it sit for two or so weeks(don't drive the car much recently). Anyways, after i jump start it, it will idle fine for about two minutes. All at once the rpms drop, the tach bottoms out, battery light flickers, then it picks up and is on its way. It does it fairly consistently for about ten minutes. Also whenever it does this, i can hear a whirring noise coming from the alternator. Does anyone have any ideas, or had this happen to you?
AudiWorld Member
Joined: May 2001
Posts: 317
Likes: 0
Check battery voltage first
If there are significant battery shorts, your car should crank slower than normal after not being used for a day or so and the battery voltage before starting will be under 12.6V. It would also be useful to check the voltage after starting and during the rpm changes to see what the alternator is doing.
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