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2.6 Front Bank Misfire

Discussion in 'Vectra B Chat' started by Mr and Mrs V, May 22, 2018.

  1. Mr and Mrs V

    Mr and Mrs V Apiarists
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    G'day lads, I hope you're all well and have recovered from the wedding celebrations. :tearsofjoy::tearsofjoy::tearsofjoy:

    I'm not overly familiar with the 2.6, but have ended up with one in my care that is running mostly on just the rear bank. Hence, I need some help..........

    It will run on both banks until it is put under anything more than even moderate load (i.e. up a hill or >40-50mph). At that point if you turn the ignition off, and then on, it will revive for a short while.

    It has had the front coil pack & all plugs replaced. It has also had a recent history of fuel trim & misfire codes, hence the front coil pack being replaced. It doesn't seem to be storing any codes & this has been occurring since the timing belt was replaced.

    Any help or direction would be much appreciated. Tia........

    Chris
     
  2. Vectra-Arctic

    Vectra-Arctic Well-Known Member
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    Timing belt a tooth or so out of correct alignment?

    Stick a 4 pot lump in :D
     
  3. Mr and Mrs V

    Mr and Mrs V Apiarists
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    Well, tbh, I didn't do the belt myself and it was his first V6 belt, but that wouldn't explain why it will run ok for a bit when you cycle the ignition. This points to something electrical/electronic does it not?
     
  4. Vectra-Arctic

    Vectra-Arctic Well-Known Member
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    Well, OPCOM or a Holden Dealer Tech 2 session should pull up any fault codes. If the timing belt is a tooth or two out then the ignition timing will be out then under extra load like going up a hill will highlight an issue.
     
  5. Mr and Mrs V

    Mr and Mrs V Apiarists
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    Initially it had random misfire & fuel trim codes following the belt change. I reset these myself with my Opcom. Shortly thereafter it started this running on the rear bank only. The owner took it to a shop and they have said it is not storing any codes. They/we are now thinking this could point to an ECU failure.

    @beef1985 , how often do the V6 ECUs fail?

    The owner, has since decided to wash his hands of it and, given it to me. It's currently undriveable and 6 hours away from me though. :icon_neut
     
  6. Vectra-Arctic

    Vectra-Arctic Well-Known Member
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    From what I know v6 ECU's are fairly reliable according to a VX mechanic friend. Though any ECU can fail.

    I thought a 6 hour drive was local by Australian standards :D
     
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  7. stewartjay

    stewartjay Well-Known Member

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    Sack going for a pint of milk down under!!!
     
  8. Mr and Mrs V

    Mr and Mrs V Apiarists
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    Well, we are relatively local now. We used to live a 16-hr drive from the same city. The only city in the state btw. Nobody wants to do it on half an engine though.

    Luckily we have the modern luxuries of milk & beer in town, but yes, Mrs V is driving the 12-13 hours for an MRI on Sun - Tues. Quite onerous at times.

    This reminds me, I've got a pair of boots to pick up from repair that same 400mi away....lol.
     
  9. Vectra-Arctic

    Vectra-Arctic Well-Known Member
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    Forward planning is essential and a good memory. :)
     
  10. Dave_H

    Dave_H Rust Engineer
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    Hey Stranger

    I’d start with the timing and go from there, there are 3 idlers to adjust so if the top one is out the front bank can literally be running incorrectly on the front bank
     
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  11. Mr and Mrs V

    Mr and Mrs V Apiarists
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    Hey matey............and still revive with a switch of the ignition? Because that can't effect the belt and/or cams. It seems to run ok otherwise.
     
  12. Dave_H

    Dave_H Rust Engineer
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    I didn’t see the revive part :lol

    Still worth checking though and possibly do a compression test
     
  13. beef1985

    beef1985 Well-Known Member
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    Hiya bud recheck the timing of only started after that if timing is fine but will been both banks at first poss out,but I would be checking fuel injectors bud if showing fuel trim,if they ok check operation on lambdas make sure they working on ideal and when rev make sure they getting good signal,it’s not normally ecu on 2.6 go down 2.5 yeah but hardley herd or hand on go on 2.6 hope helps u out bud sorry on late reply ;)
     
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