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mrmax1984 mrmax1984 is offline
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Default Should I preemptively replace index 8 injectors? - 08-22-2017, 12:52 PM

I was reading a thread on another forum the other day about spun bearings on the N54, and came across some comments that suggested leaky injectors can be to blame.

Does anyone know of where I could find a concise history of the various revisions to the N54 fuel injectors? What were BMW and Bosch? trying to fix with each iteration?

While looking into my waste gate actuators today, I took a peek and saw that I have index 8 injectors in my 2008 335i. Should I look at replacing these with index 12s preemptively?

I'm not sure that I have any particular symptoms of bad/failing injectors, other than some lumpiness and bucking in 1st gear in the morning (which walnut blasting and plugs didn't resolve, so it could also be coils I suppose).
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N54QC N54QC is offline
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Default 08-22-2017, 01:29 PM

I still have (3) index 2 and (3) index 8 on my car with no timing drops and very rarely get misfires running 25 psi. Would it be a good idea to go index 12? Sure, if you have the money or having issues with yours. Is it required, Nope. I don't think I would say you would get a spun bearing just cause you have older injectors. But anything is possible and apparently a few guys allegedly had a spun bearing due to it.


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mrmax1984 mrmax1984 is offline
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Default 08-22-2017, 01:34 PM

Thanks for your input. Out of curiosity, what oil change interval are you using? If the issue with the leaky injectors is thinned-out oil, I assume you could combat that with more frequent oil changes. I'm currently changing mine every ~7.5k miles.
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martymil martymil is offline
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Default 08-22-2017, 02:07 PM

I found the index 8 and 9 never give any trouble if you add a injector cleaner every fourth tank fill up.

If it 's not broken don't fix it.
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N54QC N54QC is offline
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Default 08-22-2017, 03:40 PM

Quote:
Originally Posted by mrmax1984
Thanks for your input. Out of curiosity, what oil change interval are you using? If the issue with the leaky injectors is thinned-out oil, I assume you could combat that with more frequent oil changes. I'm currently changing mine every ~7.5k miles.
I also run injector cleaner as martymil does but pour it directly into my 55 gal. drums since I have to drive 45 minutes to get E85. I usually change oil around 6k but should probably do it more since I'm running decent power but live a pretty busy life so don't have time to do it as much as I should. I was say if you are that worried about it, send off to have an oil analysis done so you can determine if there's anything in the oil.


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THE BEAST THE BEAST is offline
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Default 08-22-2017, 05:40 PM

I am changing mine out this weekend. I have a fuel trims variance and 1 plug came out smelling of fuel. Car runs great though and no codes.
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mrmax1984 mrmax1984 is offline
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Default 08-22-2017, 07:03 PM

I'm going to check the plugs after driving it next time, and see if any smell like fuel. I'll give the injector cleaner a try also, if necessary.

Thanks for all the replies!
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THE BEAST THE BEAST is offline
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Default 08-22-2017, 07:24 PM

It wasnt just the smell of fuel. The color of the plug showed its running rich compared to the other 5 cylinders.
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martymil martymil is offline
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Default 08-23-2017, 03:10 AM

I'd run injector cleaner for the next two tank fulls and keep an eye on your trim variance and recheck your plugs after that before you start spending good cash unnecessarily
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mrmax1984 mrmax1984 is offline
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Default 08-23-2017, 06:01 AM

Quote:
Originally Posted by martymil
I'd run injector cleaner for the next two tank fulls and keep an eye on your trim variance and recheck your plugs after that before you start spending good cash unnecessarily
I'm very much stock at the moment, so I've never run any kind of logging or data capture before. Is this something I can use Torque or MHD for? I was planning on using the OTS maps from MHD after I got my waste-gate issues sorted anyway, but I suppose I should get familiar with the monitoring aspect of it first.
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martymil martymil is offline
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Default 08-23-2017, 11:03 AM

Het yourself familiar with the jb4 or mhd logging software as it can be a valuable tool.
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