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  1. #1
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    3 out of 3 members liked this post. Yes Reputation No

    N54 injector swap DIY

    Short background:

    I started suddenly getting misfires in cylinder 6, I emailed Terry who suggested plugs, coil or injector being the cause of this. I did have some minor issues prior to the total failure of the injector, but not noticeable enough to make me look into it, no CELs no codes.

    I first changed no. 6 coil and all plugs, but still had the misfire, so I was left with changing the injector.

    When the injector failed I got the CEL and codes thrown at approx. 4000 rpm every time I revved the engine.

    The entire swap is a 30min exercise once you know what to do and have the correct tool, it was very easy!

    First write down the numbers off the new injector, you might also need the old injectors markings, a friend at BMW told me sometimes during the update they screw things up and need the old settings as well.
    Click here to enlarge

    Cylinder 6 isn't the easiest to reach, just my luck!
    Click here to enlarge

    First I removed the little plastic cap over the electric connector
    Click here to enlarge

    Then I decided to loosen the metal "clip" that holds cylinder 6 & 5's injectors.
    Click here to enlarge
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    Metal "clip" removed
    Click here to enlarge

    Next I took a 14mm wrench and removed the fuel line connecting the injector with the fuel rail at the same time I used a smal flat head screw driver to release the plastic clip that holds the electric connector in place.
    Click here to enlarge

    Fuel line removed!
    Click here to enlarge

    To get the injector out I used and old "hammer-tool" (do not know the english translation for this one)
    Click here to enlarge

    Old injector!
    Click here to enlarge
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    New injector with the new seal next to the old one.
    Click here to enlarge
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    To get the new one into the head of the engine I used mild violence banging it quite gently with the backside of a screwdriver.
    Click here to enlarge
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    Metal clip goes back into place!
    Click here to enlarge

    After this I attached the fuel line and the electric connector, done!

    After doing the install BMW needs to update the DME with the new injectors "data" there is two three digit numbers on the injector that must be written down!
    Last edited by xbox_fan; 06-16-2011 at 09:49 AM.

  2. #2
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    Awesome, awesome thread!

    Ok, ok, DIY section coming.

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    that little metal clip, is what was cracked for me on the cyl 4 side of the 3/4 clip. glad you were able to swap quickly... how did you remove the fuel line? did you de-pressurize the main line first by loosening the nut? otherwise you'd get fuel everywhere when removing the line to the injector. please keep us updated on what transpires, i really hope this fixes your problem man Click here to enlarge i know what it's like, and the aftermath is 100% worth it.
    Click here to enlarge
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    Click here to enlarge Originally Posted by oddjob2021 Click here to enlarge
    that little metal clip, is what was cracked for me on the cyl 4 side of the 3/4 clip. glad you were able to swap quickly... how did you remove the fuel line? did you de-pressurize the main line first by loosening the nut? otherwise you'd get fuel everywhere when removing the line to the injector. please keep us updated on what transpires, i really hope this fixes your problem man Click here to enlarge i know what it's like, and the aftermath is 100% worth it.
    I just removed the fuel line, there was very little fuel spraying out, though I did get surprised Click here to enlarge I did not de-pressurize it at all, don't think it matters where you do it, but I prefered doing it as far away from the pump as possible, this is to get as little air as possible into the fuel lines...

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    I have not done the coding of the DME yet, but the car revs fine with out CEL or codes already without the coding, jsut like LM said in his thread!

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    i hope you copied down the parameters on the side of it to get coded. you will need thoe 6 digits, top 3 and lower 3. car will run w/o coding, but i highly suggest getting coded. cost me $60 at the dealer.

    oddjob, i watched Matt@cambertoe do mine, and he just let the car sit for an hour or 2 while he did other things and then slowly released the connectors just in-case, but it was depressurized enough from just sitting to not spray fuel

    *edit, just saw your above post, good work Click here to enlarge

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Awesome, awesome thread!

    Ok, ok, DIY section coming.
    Thanks, didn't see any DIY for injectors so I brought the D80 and my Nikkor 85mm/1.8 Click here to enlarge

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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    Thanks, didn't see any DIY for injectors so I brought the D80 and my Nikkor 85mm/1.8 Click here to enlarge
    You did well Click here to enlarge

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    i hope you copied down the parameters on the side of it to get coded. you will need thoe 6 digits, top 3 and lower 3. car will run w/o coding, but i highly suggest getting coded. cost me $60 at the dealer.

    oddjob, i watched Matt@cambertoe do mine, and he just let the car sit for an hour or 2 while he did other things and then slowly released the connectors just in-case, but it was depressurized enough from just sitting to not spray fuel

    *edit, just saw your above post, good work Click here to enlarge
    My car have been on the driveway for 9 days, might be why the fuel pressure wasn't that high.

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    Very Very cool man. Good job.

    Oh by the way there is a DIY thread already here for this. Link =
    This is how you remove injectors on an E39 530d


    Hahaha. Yours is a lot better though.

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    Click here to enlarge Originally Posted by ILB6 IF ULB9 Click here to enlarge
    Oh by the way there is a DIY thread already here for this. Link =
    This is how you remove injectors on an E39 530d
    That was more of a comedy thread not a DIY Click here to enlarge

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    Cool Click here to enlarge I just did something similar on the weekend...I pulled out cyl 5 and 6 injectors, was curious to see how they looked as I already had a replacement ready but didn't actually replace it yet...when I pulled my old ones out I noticed considerable carbon buildup on them and as I didn't really care about these old units I tried cleaning them with a soft cloth and brake cleaner LOL put them back in, the car still works fine and still misfires at the same spot as before...here's some pics:

    Injector before:

    Click here to enlarge

    Injector after some soft cloth cleaning and brake cleaner:

    Click here to enlarge


    Question: Did you drive the car before getting it coded, how did it feel? Did you get it coded? I spoke to a local shop about coding and they said they need the old and the new numbers for coding AND then they need to go for a 5min drive 2500-3000rpm to see if there's issues. If there is they can setup some tolerance +/- a few percent...I think that's BS..
    Click here to enlarge

  13. #13
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    Cool Click here to enlarge I just did something similar on the weekend...I pulled out cyl 5 and 6 injectors, was curious to see how they looked as I already had a replacement ready but didn't actually replace it yet...when I pulled my old ones out I noticed considerable carbon buildup on them and as I didn't really care about these old units I tried cleaning them with a soft cloth and brake cleaner LOL put them back in, the car still works fine and still misfires at the same spot as before...here's some pics:

    Injector before:

    http://www.bimmerboost.com/images/im...e5a0fc20-1.jpg

    Injector after some soft cloth cleaning and brake cleaner:

    http://www.bimmerboost.com/images/im...222b1f60-1.jpg


    Question: Did you drive the car before getting it coded, how did it feel? Did you get it coded? I spoke to a local shop about coding and they said they need the old and the new numbers for coding AND then they need to go for a 5min drive 2500-3000rpm to see if there's issues. If there is they can setup some tolerance +/- a few percent...I think that's BS..
    I haven't driven it hard but revved it to 6000rpm. I am getting it coded on friday or early next week. My friend at BMW said it takes minutes to do the coding and didn't mention any need of test driving it afterwards, but I'll update this thread once it is done.

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    Nice DIY. Hopefully this clears up your issues, good luck
    Click here to enlarge

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    so? whats the feedback?

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    Wet wheater here but I am driving on map2 (14.5psi) and the car runs great even without the DME update Click here to enlarge

    I am doing the update next week, talked to BMW their service computer had crashed after a power outage.

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    great to hear you seemed to resolve your problem, do keep us updated on news and future mods Click here to enlarge
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    Got the injector coded today, a bmw tech did it for me for 30€ took 15min Click here to enlarge

    Though the old values for my cyl6 injector was wrong! I guess sometime during service someone has already replaced the injector but skipped the DME update procedure?

    I recommend any one doing injector replacement to write down all numbers on all injectors and double check the DME data for them.
    Click here to enlarge
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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    Got the injector coded today, a bmw tech did it for me for 30€ took 15min Click here to enlarge

    Though the old values for my cyl6 injector was wrong! I guess sometime during service someone has already replaced the injector but skipped the DME update procedure?

    I recommend any one doing injector replacement to write down all numbers on all injectors and double check the DME data for them.
    15 minutes an 30 pounds, not bad!

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    nice write up man, thanks!
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    15 minutes an 30 pounds, not bad!
    Well euros but the pound isnt worth much more those post-credit-holocast days...
    Click here to enlarge
    997.1 tt
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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    Well euros but the pound isnt worth much more those post-credit-holocast days...
    Whoops, my bad, even better!

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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    Got the injector coded today, a bmw tech did it for me for 30€ took 15min Click here to enlarge

    Though the old values for my cyl6 injector was wrong! I guess sometime during service someone has already replaced the injector but skipped the DME update procedure?

    I recommend any one doing injector replacement to write down all numbers on all injectors and double check the DME data for them.
    Maybe the fact that the injector was miscoded was the real issue. It might have been close enough to work for a while, but as time went on, the injector got further out of tolerance causing "good enough" to turn into "not so much". Hopefully it's all fixed up now!

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    I dont think having the wrong values kills the injector, but I think I will double check the remaining ones now when I know how to do it just to be safe...
    Click here to enlarge
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    Click here to enlarge Originally Posted by xbox_fan Click here to enlarge
    I dont think having the wrong values kills the injector, but I think I will double check the remaining ones now when I know how to do it just to be safe...
    I agree, it shouldn't harm the injector itself. I'm just thinking: what if the A/F ratio was way off on that cylinder? I believe that could cause a misfire.

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