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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Leaking Index 11 Fuel Injectors?



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      09-09-2023, 06:55 AM   #1
fqlynx
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Leaking Index 11 Fuel Injectors?

Hi

I bought some Index 11s from a refurb company in Germany, recently.

Came with new compressed, ready-to-fit seals and I bought new decoupler rings.

Car seemed to work fine for a week and then developed the EML again.

Diags do suggest an issue with the NoX sensor, so I have a new one and still need to fit it. But for good measure, I took out the new spark plugs (fitted at the same time as the injectors). All smelled of fuel a little after being parked for about 3 hours. None are wet. But cylinder 2 and 4 plugs had a much stronger smell of fuel. Does this mean the injectors are leaking?

I wonder if the faulty NoX sensor results in a much richer fuel mixture?

Cheers.
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      09-11-2023, 10:31 AM   #2
0l0dom0l0
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Before you do anything with injectors, you need to make sure you have no fault codes with the NOX system and that the car is running in all 3 engine modes.

If you don't, new adaptions won't be formed after you've replaced the injectors.
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      09-11-2023, 10:55 AM   #3
TheMidnightNarwhal
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For me when I found my injector was leaking, the spark plug tip itself was much more dark/burned than all the others that had a ash gray color.

And the smell was very striking vs the leaking plug vs others.

I would do the test again but overnight instead of 3 hours only to see how strong the smell is compared to others.
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      09-13-2023, 11:05 AM   #4
wrongmark
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When I had a leaking injector, the car ran like absolute crap for the first five mins in a morning. From what I've read, refubishing the piezo injectors is a massive gamble, many saying it can't be done. However, I understand that these are now 350+ each new, so needs must.
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      10-01-2023, 01:37 PM   #5
ChristianMoller
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How do you know if the engine is running in these 3 modes?

/Christian
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      10-01-2023, 01:40 PM   #6
ChristianMoller
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Quote:
Originally Posted by 0l0dom0l0 View Post
Before you do anything with injectors, you need to make sure you have no fault codes with the NOX system and that the car is running in all 3 engine modes.

If you don't, new adaptions won't be formed after you've replaced the injectors.
How do you know if the engine is running in these 3 modes?

/Christian

Sorry for the extra reply, Crap behind the keyboard.....
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      10-04-2023, 01:38 AM   #7
0l0dom0l0
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You need some kind of diagnostic tool, for example carly will tell you in the NOx menu. INPA will tell you.

I can hear it on my car as the injection pump starts making a high pitch noise!
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      11-13-2023, 12:11 PM   #8
BimmerMW
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Quote:
Originally Posted by ChristianMoller View Post
How do you know if the engine is running in these 3 modes?

/Christian

Sorry for the extra reply, Crap behind the keyboard.....
If you've got an Android phone, you can use this app:

https://bimmer-tool.com/

It's a great tool that also allows you to force a desulphation session if you have the 30EA error. You can log the data and it will graph for you with its in-built viewer or you can take the data to a spreadsheet (it's a CSV file).

There's a parameter called 'Operating mode': 1 - Stratified Charge; 2 - Homogenous; and 3 - Homogenous Lean. It's in mode 1 that parameters to do with the injectors are learnt, modified, adapted etc. This mode has to run. It's also the mode where you save fuel.

I run the app from an old Tesco Hudl 2.
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      11-14-2023, 06:25 AM   #9
0l0dom0l0
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Whats the fault code with the nox sensor?
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      11-15-2023, 01:12 PM   #10
ChristianMoller
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Quote:
Originally Posted by BimmerMW View Post
If you've got an Android phone, you can use this app:

https://bimmer-tool.com/

It's a great tool that also allows you to force a desulphation session if you have the 30EA error. You can log the data and it will graph for you with its in-built viewer or you can take the data to a spreadsheet (it's a CSV file).

There's a parameter called 'Operating mode': 1 - Stratified Charge; 2 - Homogenous; and 3 - Homogenous Lean. It's in mode 1 that parameters to do with the injectors are learnt, modified, adapted etc. This mode has to run. It's also the mode where you save fuel.

I run the app from an old Tesco Hudl 2.
Thanks
What interface do you use for this app?

/Christian
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