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Thread: Rough start

  1. #1
    Active Member One Ring
    Join Date
    Jun 10 2015
    AZ Member #

    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
    Join Date
    Jan 27 2013
    AZ Member #
    My Garage
    Lehigh Valley, PA

    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
    Join Date
    May 08 2016
    AZ Member #
    My Garage
    A5 S-line,A4 B8.5, Miata
    North Miami

    If its hard to start after fueling the issue is purge valve that directs fuel vapors from tank to intake manifold

    Sent from my iPhone using Audizine
    South FL VW/Audi works


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