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  1. #1
    Registered Member One Ring
    Join Date
    Sep 07 2010
    AZ Member #
    63791
    Location
    Upstate NY or SC

    97 Audi A4 Cold start issue, replaced coolant temp sensor, fuel filter, no codes...

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    My 97 A4 1.8t is having a issue when the engine is cold (sitting over ~8 hours), it does not start up easily. I usually crank it for a few seconds, stop, then give it another go and it stumbles for a second and smooths out.

    I went and did the coolant temp sensor, fuel filter, and plugs to no avail. I also ran 2 bottles of techron through the past 2 fillups (thinking that intake valves could be carboned up which would cause a bad cold start with the carbon soaking up fuel).

    At this point, I am noticing that when I put the key in the ignition, I do not hear any priming, which leads me to wonder about the fuel pump relay. On a second thought however, if this was bad, would the car not start at all?

    I guess I am asking should I be hearing a fuel pump priming sound when the key is inserted into ignition and turned to on?
    what controls this?

    Any other insight onto cold start issues? Thanks in advance!

  2. #2
    Established Member Two Rings
    Join Date
    May 12 2008
    AZ Member #
    28695
    Location
    Flagstaff AZ

    check the clear hose inside the fuel tank, had similar issues fuel was bleeding back , had a hole in it

  3. #3
    Veteran Member Four Rings GetBoosted84's Avatar
    Join Date
    Apr 10 2007
    AZ Member #
    17178
    My Garage
    01 Audi A4 1.8T Quattro / 88 Mazda RX-7 GXL
    Location
    Eastern PA

    Do you have an oem pump or a walbro? The walbro units bleed off pressure when they aren't on.

  4. #4
    Registered Member One Ring
    Join Date
    Sep 07 2010
    AZ Member #
    63791
    Location
    Upstate NY or SC

    it is a OEM fuel pump- I will be attempting to jump the fuel pump relay today and check out what happens-



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