Audizine - An Automotive Enthusiast Community

Results 1 to 16 of 16
  1. #1
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    $300 A4 Won't Start After Head replacements...Who Woulda Guessed?

    Guest-only advertisement. Register or Log In now!
    As the title says, I got this car for $300 after the PO snapped the timing belt and had no idea what was wrong or how to fix it.
    I pulled and replaced both heads, and put the motor back together as I did with my last B5 S4. I followed the Blauparts tutorial and the lock bar locked in after a few manual engine rotations.

    I went to start it, and the below video shows what happened. I've been trying to start it for a day now, and have tried the following:

    - Checking spark plug wiring is correct. It is
    - Checking fuel pump fuse. It is OK. All fuses are OK
    - Checking fuel rail for pressure. There is sufficient pressure and definitely fuel.
    - Checking for Fault Codes in VCDS. There are none besides the one for removing the battery.

    My experienced Audi friend says it's a compression issue. He thinks maybe a sensor is causing the fault.

    Any ideas what I am missing? Or ideas of where to check in VCDS?


  2. #2
    Senior Member Two Rings TheMysticWizard's Avatar
    Join Date
    Aug 15 2016
    AZ Member #
    378593
    My Garage
    '15 A3 TDI, '14 Q7 TDI Prestige, '01 Allroad
    Location
    East Bay, CA USA

    Looks to me you have no Tach signal. See the Tach just sitting there instead of bouncing around when you crank it?

    So, crank position sensor maybe?

  3. #3
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    Compression sounds good (nice, even rhythm cranking at the beginning of the video).

    Battery sounds very strong.

    Make 1000% sure you have the plug wires installed in the correct locations/order.

    Sounds to me like it may be firing the wrong cylinders due to being mechanically out-of-time (timing belt and/or chain) or having the plug wires mismatched.

    You have some combustion, so I don't think it's a dead crank sensor. But (assuming the belt/chain timing and plug wires are all good), it could be a lousy crank sensor signal (ie: a crappy waveform). This will wreak havoc with the ECU's ability to find TDC and inject/spark at the right time. I'd say that's an outside case, but possible with a faulty sensor or incorrect sensor position.
    ^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

  4. #4
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    Is this the correct plug wiring?


    If so, I may have them wrong (I plugged them in the way the PO had them, which was probably wrong since he had no idea what he was doing).

    Using the above diagram, I currently have:
    Coil # - Cylinder #
    1 - 1
    2 - 2
    3 - 3
    4 - 5
    5 - 4

    6 - 6

  5. #5
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    That diagram is correct. You have them switched up a bit.

    The correct wiring order should also be visible right on the ignition coil itself:



    Last edited by walky_talky20; 06-13-2018 at 01:30 PM.
    ^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

  6. #6
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    Clever. I didn't look very hard apparently.
    I'll swap them when I get home and post an update.

    Also, this connector leads to a black 2-pin connector that is not attached to anything. This is right next to the power steering reservoir, under the plastic cover. I've searched high and low, but don't see where its supposed to go. Any ideas?
    IMG_0342[1].jpg
    Last edited by Tumbler510; 06-13-2018 at 02:34 PM.

  7. #7
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    My guess on the wires is cooling fan temp switch or hood latch sensor.
    ^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

  8. #8
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    OK, switched the 4&5 spark plug wires, and it's definitely better than it was before, but it's still not running well.
    It finally turned over, then I gave it some gas, and as soon as I let off the throttle, it died on it's own.


  9. #9
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    OK, I turned it over a few more times, and applied more throttle. It will idle on its own now. BUT it hesitated hard when throttle is applied, and then develops a rough idle for a bit.
    Exhaust is pretty thick white smoke as well.


  10. #10
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    Well, if the thing hasn't run in a while. It may need run up to temp.
    - How old is the gasoline?
    - Have you done a throttle body adaptation?
    - Do you have any engine codes set, now that the engine has run a bit? (Even if CEL is off)

    The smoke could indicate some coolant entering one of the chambers, but I wouldn't get too worried about it yet.
    ^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

  11. #11
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    - Gas is as old as the car has been sitting. I believe 6-8 months. I put 2 gallons of 87 in yesterday
    - I have not done a TBB adaptation. Haven't even heard of it TBH
    - I don't see any engine codes in VCDS going -> 01 Engine -> Fault Codes

    I am going to give SeaFoam a try. Maybe the injectors are clogged? Maybe the fuel is bad?
    Last edited by Tumbler510; 06-14-2018 at 09:59 AM.

  12. #12
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    Consensus here in the office: Needs some BRAAPPS

    - Adapt the Throttle Body
    - Take it for a good romping
    - And get some dang Premium Fuel in the tank. lol
    - (Best would be to run through the junk that is in there as much as you can, then put in at least 5 gallons of the good stuff).

    After said romping:
    - check for codes
    - take the spark plugs out and see how they look
    ^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

  13. #13
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    RGR. I'll get that all done this weekend. I'll report back.

    Then the modification fun can begin :)

  14. #14
    Veteran Member Four Rings gtsingh91's Avatar
    Join Date
    Sep 27 2008
    AZ Member #
    33512
    My Garage
    2005 A4 1.8TQM, 2001 A4 1.8TQM, 2007 350Z
    Location
    Long Island, NY

    I bought a 98 2.8 from someone for nothing a few years back and it wouldn't run on its own unless the throttle was constantly being pressed. Removed the throttle body and cleaned it good, did a throttle body adaptation via VAGCOM and it ran beautifully. Sold it for $4k a few weeks later :)
    Instagram: @_vishis
    2001 Audi A4 1.8T Quattro - 5 Speed - Silver

    2005 Audi A4 1.8T Quattro - 6 Speed - Revo Stage II+ - Light Silver Metallic

    2000 Audi S4 2.7TT 6 Speed - EPL Stage II - Hibiscus Red Pearl SOLD

  15. #15
    Veteran Member Three Rings
    Join Date
    Feb 18 2013
    AZ Member #
    109811
    Location
    Silicon Valley, CA

    Am I doing the throttle adaptation procedure wrong?


  16. #16
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    I think you're doing it right. It is showing an ADP error there, so you're probably on the right track.

    Make certain that you don't have any fault codes stored. Throttle adaptation is meant to be done with no codes (other than maybe an ADP not run code).

    If it still won't run, try cleaning the throttle plate area, especially making sure nothing is sticky at the closed position, and try again.
    ^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



Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


    © 2001-2018 Audizine, Audizine.com, and Driverzines.com
    Audizine is an independently owned and operated automotive enthusiast community and news website.
    Audi and the Audi logo(s) are copyright/trademark Audi AG. Audizine is not endorsed by or affiliated with Audi AG.