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  1. #1
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    crank but no start

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    So after pulling the engine and tranny to replace the clutch and fix all the oil leaks I have the car back together. It cranks but doesn't fire. Pulled a coil and dont see any spark on the plug then grounding it. I have a basic code reader and there is one pending code of P0685. Clearing codes doesn't clear the pending code so I am not sure if this is an old code or part of the issue.

    I have checked all fuses in the panel beside the drivers door. The 2 relays and 40a fuse in the ECU box are plugged in correctly. I double checked all connections in the ECU box and the ECU. It looks like all the connectors on the driver side and passenger side firewall are ok.

    Can someone tell me what connector goes to the coils? Any other ideas are welcome.
    Last edited by crnook; 12-13-2018 at 11:02 AM.

  2. #2
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    EPC light is on also.

  3. #3
    Veteran Member Four Rings PaperToast's Avatar
    Join Date
    Apr 29 2009
    AZ Member #
    41811
    My Garage
    Quadzilla
    Location
    Longmont, CO

    one thing that helps is what vehicle and specs we're dealing with
    Rockin' the Rockies
    '01 allroad, 247k woot woot, still boosting on original turbos and tippy, slightly more modified. . .

    Scotty@Advanced, "Push it off a cliff, when it hits the ground you should have a few thousand horsepower available for a brief second."

  4. #4
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    Sorry, its a 2003 Allroad 2.7t 6 speed.

  5. #5
    Veteran Member Four Rings PaperToast's Avatar
    Join Date
    Apr 29 2009
    AZ Member #
    41811
    My Garage
    Quadzilla
    Location
    Longmont, CO

    3 possible things
    fuel pump (happens a lot)
    fuel relay (not too often)
    crank position sensor (happens enough)
    check those and report back
    Rockin' the Rockies
    '01 allroad, 247k woot woot, still boosting on original turbos and tippy, slightly more modified. . .

    Scotty@Advanced, "Push it off a cliff, when it hits the ground you should have a few thousand horsepower available for a brief second."

  6. #6
    Established Member Two Rings Bigglezworth's Avatar
    Join Date
    Jul 16 2012
    AZ Member #
    96970
    My Garage
    Pair of '03 RS6 Saloons, '02 S6 Avant, '91 NSX, & '87 GNX
    Location
    Calgary,AB

    Make sure it's not the imobilizer
    02 S6 Avant w/ no stuff - Pokey
    03 RS6 Saloon w/ stuff - quick
    03 RS6 Saloon w/ MORE stuff - super quick
    91 NSX CDN issue w/ 6spd & BBSC - quicker yet
    87 Buick OEM GNX clone w/ LOTS of go fast goodies- quickest

  7. #7
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    From what I have read if it were the immobilizer it would show the car/key light in the gauge cluster. I dont see that as of now.

    If it were the fuel pump wouldn't I see spark from the plugs? I will test this once I can get it back home. Waiting for the snow to melt so I can get the flatbed up the hill.

    The crank sensor makes the most sense. I read that the tach should jump a little when it cranks but it never moves, no twitch at all.

    I keep looking for some connector I forgot to connect when putting the engine and tranny back in.

    Thanks for the suggestions. I'll report back in a few days once I am able to work on it again.

  8. #8
    Veteran Member Three Rings
    Join Date
    Jun 07 2005
    AZ Member #
    6784
    Location
    Shepherdstown, WV

    have you confirmed you have the main ground by the starter connected and the cluster of grounds under the coolant tank?
    80 rabbit pickup, 98 TJ 4bt cummins, 00 180TTQ 6spd, 02 Freelander, 03 Allroad 2.7t 6spd swap now with K04s, 06 A3 2.0T w/GT3071R (2012 JSW TDI and 2015 GSW TDI now in TDI purgatory )

  9. #9
    Established Member Two Rings C5S6's Avatar
    Join Date
    Oct 04 2008
    AZ Member #
    33837
    My Garage
    '02 S6 Avant, '03 A6 Sedan
    Location
    5280

    crank position sensor is below the drivers side EGT sensor. super easy to see/replace if you've deleted the damn kombi valves AND the EGT sensors.
    Maybe you crushed some of the wire harness between the trans and block?

    When the crank position sensor went out on my wife's A6, it would not restart after coming up to temperature one day when we were out. Waited an hour (not knowing the problem, but tried diagnosing with no tools - fuel pump etc...). Out of desperation before calling a tow, I pushed the car out of the parking spot and tried the old pop start. Got it going fast enough running along side with the drivers door open, hopped in, 2nd gear, dump the clutch, and by some miracle (it seemed at the time) the car fired right up. We went straight home and I did my eResearch, bought a crank sensor and replaced it the next day.
    -TJ
    2002 S6
    2003 A6 2.7t MT6

  10. #10
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    Quote Originally Posted by chris86vw View Post
    have you confirmed you have the main ground by the starter connected and the cluster of grounds under the coolant tank?
    Yea, that was one of the first things I though of. The brown wires by the ECU box are all connected to the ground and The ground between the starter and alternator is connected.

  11. #11
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    Quote Originally Posted by C5S6 View Post
    crank position sensor is below the drivers side EGT sensor. super easy to see/replace if you've deleted the damn kombi valves AND the EGT sensors.
    Maybe you crushed some of the wire harness between the trans and block?
    I bolted the trans to the engine while out of the vehicle and I am pretty sure I didn't crush or break any wires. The replacement crank sensor gets here today and I have the car back at my house finally so I hope to get a chance tonight to replace it. I have not deleted anything on the car so its tight in there. Hopefully I can get a wrench on the bolt/allen head holding the sensor to the bell housing. I might have to go up from underneath.

    I have rebuilt a few engines in my time and one thing I do before starting them up the first time is turn the engine over with the starter without the plug wires/coils connected so it pumps oil everywhere before firing. On the audi I left the coils unplugged and cranked it for 15 seconds or so. Could that have fried the ECU?

  12. #12
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    What a pain to replace the crank sensor. I finally had to cut down a 1/4" drive 10mm socket. There is a turbo coolant line behind the bolt that wont let a normal socket fit.

    Changed the crank sensor out with a new Bosch unit and same issue. Cranks but wont event try to fire. No spark at the plugs.

    I keep thinking there is some connector I have not plugged in or something basic I forgot to do when putting the engine back together but I cant find anything obvious. The car ran fine before I messed with it other than oil leaks all over and a slipping clutch.

  13. #13
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    Is the free Ross-Tech VCDS-Lite software enough to troubleshoot the car or do I need to buy other software or a VAG-COM device?

  14. #14
    Active Member Two Rings
    Join Date
    Oct 10 2018
    AZ Member #
    428609
    My Garage
    2003 Audi Allroad 6spd, 2011 F350, 1997 F250LD, 1973 Jeep J4800
    Location
    Portland, OR

    It was something easy.

    There are 2 relays in the ECU box. They can be plugged into the wrong spots. I switched them and it fired right up.

  15. #15
    Veteran Member Three Rings
    Join Date
    Jun 07 2005
    AZ Member #
    6784
    Location
    Shepherdstown, WV

    Quote Originally Posted by crnook View Post
    It was something easy.

    There are 2 relays in the ECU box. They can be plugged into the wrong spots. I switched them and it fired right up.
    Damn I was thinking something with the relays (because I did that) but couldn't remember what it was.. I was thinking it was something with they could be turned but that made no sense.

    Glad you figured it out.
    80 rabbit pickup, 98 TJ 4bt cummins, 00 180TTQ 6spd, 02 Freelander, 03 Allroad 2.7t 6spd swap now with K04s, 06 A3 2.0T w/GT3071R (2012 JSW TDI and 2015 GSW TDI now in TDI purgatory )

  16. #16
    Veteran Member Three Rings audinutt's Avatar
    Join Date
    Jan 11 2007
    AZ Member #
    14809
    My Garage
    2001 A8l 2001 A4TQM Avant
    Location
    texas

    On my s8 the crank sensor wire was broken on my donor engine harness. Couldn't see it found it by tracing back and the wire was still in the connector. When I pulled on the broken wire it pulled right out of the connector. is it possible you snagged a wire when removing the engine?

    Sent from my SM-G935U using Tapatalk
    98.5 A4 1.8T



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