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Thread: 1.6TDI Engine Misfires and Stalls when Idle

  1. #31
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    Quote Originally Posted by Jack@European_Parts View Post
    Not with this thing called a particulate filter/trap
    oh yes I can see that cleaning up a load of crap coming out of the back, but no loss of oil as well, good sign I hope...

  2. #32
    NostraJackAss Jack@European_Parts's Avatar
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    Have you verified no intake leaks for false air present at this respective cylinder.....?

  3. #33
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    Quote Originally Posted by Jack@European_Parts View Post
    Have you verified no intake leaks for false air present at this respective cylinder.....?
    Yes, no air leak found.

    There is no oil burning so it is reasonable to summize no ring seal leak. Injectors have been ruled out. So perhaps sticky valves. Compression test is also pending.

    I am going to see how the car runs under normal driving conditions in the coming days, i.e not trying to provoke the symptoms at a standstill. Thanks.

  4. #34
    NostraJackAss Jack@European_Parts's Avatar
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    Be sure it is not an air leak at intake and maybe consider an inspection visually of the gaskets.....especially if CR is good.

  5. #35
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    Here is the latest update, issue still ongoing. I replaced one injector on cylinder 3, then moved it to 4. Now thinking now of replacing the other 3. Cylinders 3 and 4 seemed to have calmed themselves down and now 1 and 2 are deviating +/-1 often when the anomaly occurs. This is the video of what this thread is about

    I have seen other Youtube videos that suggest multiple injector problems so worth a shot providing I can get some cheaper known working injectors from somewhere. Not worth getting them new though as the price is pretty high at the dealer (think USD600+ per injector, crazy money). A similar vehicle with the same symptoms and cure saying 3 injectors were replaced...

  6. #36
    NostraJackAss Jack@European_Parts's Avatar
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    Please post the new deviation #s............

  7. #37
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    A bit of a contrast to the last lot, which has cast doubt now on the other cylinders. I think I am right in saying that Positives are worse than negatives (i.e ECU is forcing more diesel into the cylinders for positive and leaning it for negative, so the negative is compensating for the positive deviations)?

    I suspect I need to source another bunch of injectors to rule this subject out again, what do you think?


  8. #38
    NostraJackAss Jack@European_Parts's Avatar
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    Actually it is kind of the opposite as a result.

    I would say the numbers............... as close to zero, are the wanted result for deviation.

    You may see even more improvement running at idle.......... if swapping currently 1 and 2, to get the balance closer.

    You still want to factor in the offset for 1 and 4 piston being at TDC when 2 and 3 are at BDC......

  9. #39
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    Quote Originally Posted by Jack@European_Parts View Post
    Actually it is kind of the opposite as a result.

    I would say the numbers............... as close to zero, are the wanted result for deviation.

    You may see even more improvement running at idle.......... if swapping currently 1 and 2, to get the balance closer.

    You still want to factor in the offset for 1 and 4 piston being at TDC when 2 and 3 are at BDC......
    I am aware 0 is the deviation I want in an ideal world... But from the research I have done on the web together with feedback here, positive deviation could point to an issue with that respective cylinder (perhaps valve seal leakage/compression or piston leak). I don't think it's this on the basis that I am getting great MPG and absolutely no smoke at the back cold/warm etc. And when the car is moving, it pulls really well with no lag. I know the DPF takes out a load of smoke but surely if there was a leak and oil/unburnt fuel was getting in to the exhaust system I'd see something at the back end.

    I will probably have a go in swapping 1 and 2 to see if anything happens but that will be a job for next week.

    Based on what you have previously said, I am aware 1 is compensating for 4 and 2 is compensating for 3. But in this latest case 2 is not balancing out 3. Still, I have one surplus injector which I pulled out previously (that I don't know is faulty) that I could start changing with the other 3. Only issue being I don't honestly know if any injector is faulty as the readings are getting inconsistent now with what I have had in the past.

    First it was deviation on cylinder 3 that was way out (even though in spec). I have since replaced injector 3 and cylinder 3 deviation was still around +2.8, then I swapped injector 3 and 4 in case the replacement injector was faulty and the big deviation stayed on 3, now I check it today and it's 1 and 2 that are in positive deviation.

    I am chasing the deviation. If only I could just swap all 4 for little expense for a test to see if that did anything... At least the car is continuing to run, this could take a while

    Can someone please check my adaptation values input convention are right, as I see there are injectors with 7 characters and injectors with 6 characters stamped on them. Mine have 6 characters stamped on them and I recall seeing a zero (0) at the end of each of my original values in adaptation.
    Example:
    Injector 1 Correction Value: BJHHKD0
    Stamp on Injector is BJHHKD.

    I am just checking they are not screwed up values as I was following this convention in engine>adaptation when swapping injectors.
    Last edited by airbus; 06-18-2014 at 04:41 PM.

  10. #40
    NostraJackAss Jack@European_Parts's Avatar
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    I think you are confusing my reasons for swapping the injectors now......

    I am just trying to move the balance to a happy spot.....based on the position of the pistons and the deviation currently displayed.

    Hopefully an improvement at idle verse buying 4 new injectors.

    I would absolutely try that other injector and see what deviations it creates in each cylinder.


    Just some time to play and get dirty hands with diesel fuel......

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