Question about 2002 Audi A4

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Faulty fuel pump?

The car idles all over and sometime wont start when warm. i ran one of the injector cleaners a while back and changed the fuel filter about 400 miles ago. when i pulled it was filthy. would the next option be to change the fuel pump? or is it still a clogged injector?

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  • VWdan
    VWdan May 11, 2010

    how many miles on it?

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I would recomend you to sell your audi as fast as you can before its too late, audi is a very bad car, hasnt had any good reviews at all and in cars, its really luck if you dont have any problems with them. sell it and buy a new car, you can get a new one at a good price, the most important thing is that it will be new, keep that in mind ! good look

Posted on Apr 14, 2009

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I am not certain how to tell if the fuel pump is intermittently cutting out other than eliminating other reasonable possibilities. I had that happen to me and like you I changed the fuel filter and ran injector cleaner through my tank and still had the problem. I dropped the tank and replaced the pump and it ran great afterward.

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The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
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