Question about 1998 Audi A4

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Hi, Irratic revs when idle

Hi,
My Audi A4 battery went dead on me due to leaving my lights on and since then when i start it up it imidiatly stalls. once its up and running its ok until i come to a halt/Stationary the revs go very low and behave irractically.... and the car nearly stalls.. Can anyone help me?

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  • cornayd Apr 05, 2009

    After the battery was flat and you start the car it has very high revs and the idling hunts all the time. This happens when you idle and when you drive it feels like it stutters too.

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You need to reset the throttle body. Sometimes you can do this by going out to your car and turning the key to the "on" position. Don't crank the engine - just turn it to on. Let it sit like this for 15 min. Your throttle body shoulld reset. Good luck. Check out audiforums. c o m or audiworld for audi spec issues. Good luck!

Posted on Feb 15, 2009

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If your volt gauge reads low, then the low voltage will send erratic signals to your computer and make it run funny.

Could also be bad gas. Try running premium.

Could also be a mass air flow sensor. But it should throw a check engine light in that case.

Could also be a vacuum leak. Raise hood and listen for suction noises.

My Audi charges at about 14 volts b/c it has heated seats, etc,etc. So start with checking your voltage first.

Posted on Feb 10, 2009

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co7196
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SOURCE: 03 Audi A4- Coolant fan runs until the battery dies

What does the fan do when you restsrt/charge the battery? Start up again? Replace the sending unit, or unplug the sending unit first. If fan keeps running, the relay is faulty.
if it stops, the sending unit is at faulat. good luck

Posted on May 31, 2009

  • 1 Answer

SOURCE: Have an audi a4 1.8T Cabrio. Battery went dead,

I had the exact problem with my A4 2001 1,9 TDI but i just turned the car on, then first turned the steering wheel to the left as far as it goes, then to the right (i dont know if this is necessary but this is what i did). After i drove for few meters,the light went off and it worked normally.

Posted on Oct 04, 2009

  • 1 Answer

SOURCE: 2003 audi A4 2.0, low idle, flashing yellow light on dash

it's a coil- these are commonly going out on audi's...it happend to me. it's like you are running on 2 cylinders instead of 4- you need to get it replaced- it's about 75 bucks.

Posted on Dec 09, 2009

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