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Thread: A3 Wont Start

  1. #1

    Join Date
    Oct 2012

    A3 Wont Start

    Recently bought a 2001 A3 (AUM). It had a lumpy idle so I replaced the MAF and seemed to cure it.
    I gave it a service then it started to run badly at low revs, fine on turbo. Then it started to idle badly.
    I plugged into VCDS and it showed misfire on cylinder 2 and coil ground problem.
    I replaced the coil and it was still the same. I then noticed the coil wiring was cracked.
    I replaced the coil wiring loom and at the same time simplified the breather pipes and fitted an oil catch can.
    I came to start it and it wouldn't start. It turns over but nothing.
    I plugged into VCDS again:

    6 Faults Found:
    17766 - Cylinder 2 Ignition Circuit: Open Circuit
    P1358 - 35-10 - - - Intermittent
    16396 - Bank 1: Camshaft A (Intake): Advance Setpoint not Reached (Over-Retarded)
    P0012 - 35-10 - - - Intermittent
    17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
    P1297 - 35-10 - - - Intermittent
    18010 - Power Supply Terminal 30: Voltage too Low
    P1602 - 35-10 - - - Intermittent
    17535 - Fuel Trim: Bank 1 (Mult): System too Rich
    P1127 - 35-10 - - - Intermittent
    16706 - Engine Speed Sensor (G28): No Signal
    P0322 - 35-00 - -
    Readiness: 0010 1101

    Address 08: Auto HVAC
    Controller: 8L0 820 043 H
    Component: A3 KLIMAAUT
    Coding: 00041
    Shop #: WSC 06435
    Note: Excessive Comm Errors

  2. # ADS
    Join Date
  3. #2
    Lewis583's Avatar
    4th Gear

    Join Date
    Mar 2010
    You tried clearing the codes and cranking again? If not try that first.

    If its still no good, go into measuring blocks and watch Engine Speed whilst cranking, if it reads 0 then crankshaft sensor/crankshaft sensor wiring will need further investigation.
    2008 E92 BMW 335i M-sport
    1990 Golf GTi w/ a 20v heart BUILD THREAD
    Full VCDS

    2006 A3 2.0T quattro S-line R.I.P. You will be missed.

    ** Breaking - 8L 1997 Audi A3 1.8T. **

  4. #3

    Join Date
    Oct 2012
    Went to a test on the sensors and it started. The only thing different was I plugged the light switch plugs back in and put the lower dash panel back on. (had installed a boost gauge at the same time)
    Audi A3 1.8T 2001 AUM - Custom Stage 2 Map. 3" De-cat Downpipe, 2.5" System, 100mm SMIC, CAI, BKR7E Plugs, Forge Recirc Valve. Uprated Clutch with Lightened SM Flywheel. SAI, N249 Removed, Simplified PCV with Oil Catch Can, Silicone Vac and Boost Hoses.

    Seat Altea 2.0TDi DSG 2004 BKD - Custom Stage 1 Map. Now with new Engine, Turbo, Intercooler, Piping and Radiator (due to Turbo failing and dumping bits into the engine)

    Essentials - VAG-COM. WinOLS.



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