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Thread: Veccy C 3.2l V6 ECU problem (?) in Australia

  1. #1
    Regular Member Tfer's Avatar
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    Default Veccy C 3.2l V6 ECU problem (?) in Australia

    Okay... the Veccy C (3.2l V6 manual) took on a load of dirty fuel. Had to have her fuel tank removed and cleaned, fuel system cleaned out, and injectors removed and cleaned.

    Now when Holden put her all back together, they did say she was having some issues with idling rough, but apparently tweaked her and sorted her out.

    Symptons were:
    • Engine management light flashing on and off (and sometimes on solidly)
    • Rough, very rough idle.... hmmm, Holden told that me that the previous problem was not enough fuel was getting in through each injector... causing some dramas
    • Very rough under load (ie. accelerating, or pressing accelerator down)
    • Lack of power (feels much less powerful than a 1.8l auto AH Astra, one of which I drive regularly... and no criticism intended)
    • Engine will sometimes just die.... mostly when coming to a stop, but will start easily.
    So she is not a happy girl, and I don't think I would have taken on board more dirty fuel.

    Holden have said the following problems exist:
    • Fault codes on the ECU indicate the ECU needs replacing (RRP $2,050 AUD plus labour, but with trade price servicing, down to $1,850 AUD fitted)
    • Oh, and all spark plugs need to be replaced as they are fouled
    So I asked had we tried the Veccy with new spark plugs first.... no, but they will just foul up again, came the reply. So humour me....new spark plugs in, and she is purring fine..... they said it won't last long.

    Update....
    Holden replaced the spark plugs.... for this trial purpose, I asked for just the normal/standard ones to be put in (no use wasting platinum plugs if indeed they do foul), and I collected the old girl up yesterday lunchtime.

    Late that afternoon, about 120kms later.... she had one of her moments.... rough idling, engine management light flashed on and off.... then righted herself....

    Next morning.... another very brief episode.... and again righted herself....

    Well.....

    The Veccy is officially dead... won't idle and is having a few issues starting (my rough guess are the spark plugs have fouled up again after 500km)

    Luckily I have the use of my partner's AH Astra CDX to toodle around in.... yay, still in an Opel

    Okay.... some of the more finer details:
    • The Veccy is now 5 years old (build date 12/02) but was first registered 3/03 and has done 164,600km.
    • Holden has done the following:
      • Removed fuel tank and outsourced for draining and cleaning
      • Cleaned fuel system
      • Cleaned injectors (removed each one to clean)
      • Once the fuel system was back together, they found she was idling a little rough, and so fiddled around and got her idling smoothly (well, smoothly for a Veccy V6)
      • After about a week, the old symptons came back
      • Holden upon diagnosis, produced the 5 fault codes and said it was the ECU, and also said the plugs were fouled and needed replacing once the ECU was replaced.
      • Under my directions, Holden replaced the plugs (normal ones for now) and she ran smooth, apart from 2 little glitches (engine management light flickered on and off, rough idling, rough under load (not as much though as when at idling) ran for approximately 500km and then enough was enough.
      • It is believed the plugs are fouled up again (Holden said they would foul up almost immediately I drove her out the first time).
    Now what I am doing (my plan of attack thus far):
    1. Ask auzvectra (Opekaus member here in Australia who is a whiz especially with Astra G Turbos) to remove ECU and ignition module and send these plus ignition key to Petroject in Nunawading Vic, which for about $100 they check the ECU (put it on some sort of wiring harness to convince the ECU that it is still in the Veccy).
    2. If there are any ECU faults, Petroject will advise if these can be repaired (if so, may cost up to $400 or thereabouts)
    3. ECU returned and Matt installs.
    4. If ECU is found to be fine, then next step is to get the old girl (possibly place new plugs in first) to an EFI specialist and check out the fuel system, etc which appears to be where most people are headed.
    5. Then we shall assess further.
    P0300 - Engine Misfire Detected
    P0301 - Cylinder 1 Misfire Detected
    P0303 - Cylinder 3 Misfire Detected
    P0306 - Cylinder 6 Misfire Detected

    Update: ECU and immobiliser module removed
    Okay.... thanks to auzvectra and vectraguy01 (and I think they both learnt a few new things), the ECU and immobiliser module has been removed and sent to Petroject in Vic today.

    The immobiliser module was not a separate removable item as per the Astra G's or Veccy B's but rather formed a part of the control unit wrapped around the steering column (the pictures will explain).






    Update on the Veccy....
    • Should hopefully have an update on the ECU Monday (waiting on an engineer from Opel to return to work, to assist Petroject with some encryption issues)
    • If there is a problem with ECU, they said 2 -3 days to recode, fix, whatever it is they do and then an overnight return.
    • If no problem with ECU, then overnight return of ECU
    • ECU et al to be reinstalled into Veccy and then off to an injection specialist on the Gold Coast

    Update time again..... Sam from Petroject is having some issues with getting around the Veccy's immobiliser, has ground to a halt, as cannot get the ECU to run properly on the bench. Luckily, Auzvectra is trying to assist here by procuring a wiring diagram for the Veccy C so that they can work out what "wattage" is required where.... thanks Matt

    And this is when I ask all of you for assistance...... pretty please?

    Does anyone have access to a wiring diagram for a 3.2l V6 Veccy C and if so, can I have it/ buy a copy?

    Also, if anyone has anything to add here..... I would love to read your comments.....

    I so want my Veccy C back and miss her power dreadfully..... especially compared to the AH Astra 1.8l auto I am driving atm.

    Thanks in advance

  2. #2
    Regular Member shan's Avatar
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    I'm no specialist at all. But I would think the fuel lines still have/have had crappy fuel in them and it's getting through.
    Did they clean all fuel lines when the cleaned the tank?

    Somebody will have a wiring diagram i'm sure.
    It's the middle of the night in the UK so i'd check up later.
    I hope you get it all sorted out soon and your back in the motor happy.

    Good Luck

  3. #3
    Regular Member Tfer's Avatar
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    Quote Originally Posted by shan View Post
    I'm no specialist at all. But I would think the fuel lines still have/have had crappy fuel in them and it's getting through.
    Did they clean all fuel lines when the cleaned the tank?

    Somebody will have a wiring diagram i'm sure.
    It's the middle of the night in the UK so i'd check up later.
    I hope you get it all sorted out soon and your back in the motor happy.

    Good Luck
    Thanks for your input here Shan

    Holden drained the fuel tank, cleaned the lines and the injectors.... charged me for it, and said they had

    But you have suggested the same thing a couple of others here in Australia have also suggested.... and perhaps they haven't done it properly.

    Its the next job after the ecu....

  4. #4
    Regular Member Gsi3.2's Avatar
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    you can get a fuel sample from the valv on the fuel rail, if you have the correct equipment to do so, that will tell you if the fuel is clean or not..

    Fouling plugs suggests a very rich mix, so i'd be interested in what holden have done to 'get it running'. they always run rich for the first couple of minutes while on 'cold start' but it shouldn't foul the plugs..

    the misfire codes are more than likely being generated by the fouled plugs and their inabilty to ignite an overrich mixture..

    Unless something very tragic has happened, i also find it hard to see how incorrect fuel can damage an electronic component.. that is usually the result of voltage spike or incorrect wiring..It does need testing, but i still fail to see how it doesn't work, if holden have managed to extract fault codes from it, if you see what i mean....

    i don't know what the conversion rates are £GBP/$AUS at the mo, but an ECU for your car over here costs £316.54+Tax ( £371.94 all in)..

    If it's cheaper than holden or you can source one, then i'll happily obtain one for you..

  5. #5
    Regular Member Tfer's Avatar
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    Quote Originally Posted by Gsi3.2 View Post
    you can get a fuel sample from the valv on the fuel rail, if you have the correct equipment to do so, that will tell you if the fuel is clean or not..

    Fouling plugs suggests a very rich mix, so i'd be interested in what holden have done to 'get it running'. they always run rich for the first couple of minutes while on 'cold start' but it shouldn't foul the plugs..

    the misfire codes are more than likely being generated by the fouled plugs and their inabilty to ignite an overrich mixture..

    Unless something very tragic has happened, i also find it hard to see how incorrect fuel can damage an electronic component.. that is usually the result of voltage spike or incorrect wiring..It does need testing, but i still fail to see how it doesn't work, if holden have managed to extract fault codes from it, if you see what i mean....

    i don't know what the conversion rates are £GBP/$AUS at the mo, but an ECU for your car over here costs £316.54+Tax ( £371.94 all in)..

    If it's cheaper than holden or you can source one, then i'll happily obtain one for you..
    Thank you Gsi3.2..... really appreciate your feedback and thoughts and yes what you say makes total sense to me.... pity Holden cannot see past their bottoms....

    Before the company can diagnose the ECU correctly, they need to get their hands on a wiring diagram.... which apparently Holden nor Opel will release to them ?

    Aaargh.......

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    Quote Originally Posted by Tfer View Post
    Before the company can diagnose the ECU correctly, they need to get their hands on a wiring diagram.... which apparently Holden nor Opel will release to them ?
    I'm not sure about here in Australia, but in Europe you can pay for access to this site which is an online version of TIS:
    https://opel-tis.eur.gm.com/imtportal

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    Regular Member Tfer's Avatar
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    Quote Originally Posted by stevedee3 View Post
    I'm not sure about here in Australia, but in Europe you can pay for access to this site which is an online version of TIS:
    https://opel-tis.eur.gm.com/imtportal
    Thanks stevedee3.... we may have located a wiring diagram.... one of Opelaus' members is back in Oz on thw weekend and he may actually have one.... bloddy hell I hope so

    But if not, and if no one here can help.... then I may just use this link

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    [Ex]Admin Duncan's Avatar
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    Which specific wiring diagram are you after?

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    Regular Member Tfer's Avatar
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    Quote Originally Posted by Duncan View Post
    Which specific wiring diagram are you after?
    Thanks Duncan..... Hmmm.... I am not mechanically/electrically minded but the wiring diagram being sought after is the one that shows how the immobiliser module is wired up and relating to the ECU..... the immobiliser module, key and ecu are to be wired up on a test bench...Hope this helps......If not, my email address (should anyone have any questions) is thomasskennerton@telstra.ap.blackberry.net as it is 6:20am Saturday morning here in Australia, and I am about to hit the road in the Astra up the coast, but email is accessible via my Blackberry

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    Regular Member Tfer's Avatar
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    Quote Originally Posted by stevedee3 View Post
    I'm not sure about here in Australia, but in Europe you can pay for access to this site which is an online version of TIS:
    https://opel-tis.eur.gm.com/imtportal
    Link forwarded to Petroject for their use.... fingers crossed

    And thanks!

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