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  1. #1
    Active Member One Ring
    Join Date
    Aug 18 2017
    AZ Member #
    405243
    Location
    Burgas,Bulgaria

    Cranks but doesnt start

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    Hello,guys yesterday I was changing my spark plugs and i noticed that on 1 of the cylinders the plug that connects to the coil is broken.It was late so no parts store were open for me to get replacement.Today I went to the Porche dealership and got the plug,got home and i removed the old one and put the new one in now the car cranks but doesnt start there is 1 code in Vagcom 17072 ECM Power Relay load curcuit J271 P0688-004-Open Circuit.Any help will be appreciated,maybe I connected the wires wrong and a fuse blew up?

  2. #2
    Senior Member Two Rings
    Join Date
    Jan 03 2008
    AZ Member #
    23834
    Location
    Richmond

    How did you replace the old one? If you moved the pins over, could you have put one in the wrong hole? A fuse could give you an open, but I would think it would detect the overcurrent before that.

  3. #3
    Active Member One Ring
    Join Date
    Aug 18 2017
    AZ Member #
    405243
    Location
    Burgas,Bulgaria

    Quote Originally Posted by userbob0001 View Post
    How did you replace the old one? If you moved the pins over, could you have put one in the wrong hole? A fuse could give you an open, but I would think it would detect the overcurrent before that.
    The fuse number 29 was blown i replaced it started right up but why it would have been fried?For now no problems i will continue driving and see if it blows again.

  4. #4
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    The fuse was blown because your coil pack connector shorted out (positive wire and ground wire came in contact with one another). Or, it possibly happened at some point in the middle of your crunchy coil pack harness. In any case, it was caused by moving stuff around to change the spark plugs.

    Fuse 29 drives all 4 coils packs, along with a sense line to the ECU so it is able to see any problems with that power source, and then give you a nice code for it.
    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, 4.11 Final Drive, APR 93, R8 coil packs, Labree HFC & DP, 2.5" Exhaust, ST Coilovers, 034 RSB, A8 Brakes Front & Rear, 18" RS4 Reps
    2006 Passion Red Volvo V50 T5 AWD 6MT
    "You need to know what you are doing...Its like a rainbow jungle in there." - Redline380



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