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Thread: 1.8T AGU Fubar?

  1. #1
    Reverse Gear

    Join Date
    Dec 2012

    1.8T AGU Fubar?

    Evening folks,

    I'm having problems with my 1997 1.8T AGU engine with 170k on the clock. Original thread here:
    1.8T Turn over but not firing

    The original issue seems to have spiralled into a whole world of pain.....

    Brief background: Driving along one night, done 25 miles and car started misfiring above 4k rpm then eventually cut out, failing to start again that night. Next morning got it started and drove it home, after exactly 25 miles again the misfire started, 3 miles later it cut out and wouldnt start again. Changed fuel filter and fuel pressure reg..... made no difference.

    Now, it sits in the drive, I can get it running but the throttle has to be right down. When running it sounds well enough, but will not idle what so ever. Stalling every time. Symptoms of god knows what are now:

    - 4000rpm+ stutter, splutter and misfire.
    - Will not start without throttle down
    - Will not idle

    Now, for the mind boggling part. When ignition on but engine off or after stall the following happens:

    - Fuel pump relay triggers in odd pattern (fast and slow for alternate durations) Checked relay, all is good.
    - As expected from testing relay... fuel pump doesnt recieve constant 12v, but 12v in alternate pulses.
    - Throttle twitches in same rythm as fuel pump relay. I can feel it twitching on pedal, but also see stepper motor twitching next to the throttle butterfly. Again this is in same alternate and odd rythm as fuel pump relay.
    - Throttle stepper motor emmits high pitched whine.
    - 3rd injector is constantly firing until I pull the plug off. Then the relay stops and throttle stops.

    I took it to a local garage for the dignostics test, but he couldnt get the computer to connect to ECU. Got a fella coming tomorrow to have another go... a pro apparently. Either way, I've never come accross anything like this before. Could it be a sensor fubar? Or as much as I hate to say it, the ECU wrecked?

    Any help much appreciated.
    Thanks guys,

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  3. #2
    s33nyboy12's Avatar
    5th Gear

    Join Date
    May 2012
    East midlands
    You should post up where you are in the uk or check the vcds section of the forum to see if anyone near you has vagcom and can help.

    Current: 2013 Audi A3 2.0 tdi s line 8V in black SD nav+ extras, E46 BMW M3, 1971 Volvo p1800, 2014 Ford transit sport 155ps ;-)

    Previous : Focus st 225 stage 1 (265 bhp and too much torque), 2002 audi s3 bam engine completely OEM, 2001 Audi a3 1.8 TQS 221bhp and about 20 other cars, majority civics ek4/ek9 and Bmw / Audi soot chucker's!

  4. #3
    Broken Byzan's Avatar
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    Apr 2004
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    Water ingress into ECU or wiring would be my guess given the random ness of it

  5. #4
    Soon be christmas!!!!!!!!!!

    Join Date
    Feb 2008
    North Wales
    duff earth or dead ecu. try volt dropping the earths

  6. #5
    16Klappe's Avatar
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    New ECU time, not a huge job at all. Speak to Niki at R Tech and he can defeat it, as long as it comes from the same software car it'll plug right in.
    I quite often say I'm going to do things.

    Then never do them.



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