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Thread: Rough start

  1. #1
    Established Member Two Rings bigwilly1267's Avatar
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    Rough start

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    I have an 2008 Audi S5. I had the engine replaced and now when I put gas in my car I have to push the gas pedal to the floor in order for the car to start. I also get an EPC light that comes and goes. Where do I start checking for issues.


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  2. #2
    Established Member Two Rings sfouRS's Avatar
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    Jan 27 2013
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    You're running 91-95 octane?

    My car will do that from time to time if I get cheaper gas. I try to run Wawa, Shell or Sunoco premium.

    Also, check plugs. Worth running premium plugs and changing them often.

  3. #3
    Established Member Two Rings vwladz's Avatar
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    May 08 2016
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    If its hard to start after fueling the issue is purge valve that directs fuel vapors from tank to intake manifold


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  4. #4
    Established Member Two Rings bigwilly1267's Avatar
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    Virgina

    I changed the purge valve two weeks ago


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