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      04-07-2021, 08:35 AM   #1
leon4822
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Question 2012 650I missfire

Hi, everyone.

I have problem with my 2012 650i, n63 engine.
Injectors were replaced for index 12s, a year ago by the previous owner, after a while car started throwing DMF and codes, missfire on cylinder 2, it was running a little bit uneven, i could feel little missfires under acceleration.
I replaced spark plugs, then changed coils, it did not help, so i've checked the compression, it was fine so i've bought a new injector (also index 12), i've installed it with brand new seal and coded it.
Car ran perfectly, no codes, smooth under full throtle, basically the issue was gone. Yesterday, i came back from to home, parked the car in garrage, and check engine light appeared.

DTC- 140201 - Cylinder 2 misfire detected: cylinder injection cut out.
DTC -142002 - Misfiring: tank level too low

The car was low on fuel (like 30-40km of range left), but would it be a reason to throw this code? What may be the issue?

The only thing that comes to my mind, is decoupling element on injector 2, i forgot to order it, and used the old one. Is it that important?

Second thing, when i took second injector out, i've noticed it had a little bit of play from left to right, when i've unscrewed it. Also the metal fuel line that goes directly to injector from underneath, i felt like it was a little bit loose (i could turn it a few deegres, with a little bit of force). Should it be like that?

I'll be glad for every advice.
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      04-07-2021, 01:11 PM   #2
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Quote:
Originally Posted by leon4822 View Post
Hi, everyone.

I have problem with my 2012 650i, n63 engine.
Injectors were replaced for index 12s, a year ago by the previous owner, after a while car started throwing DMF and codes, missfire on cylinder 2, it was running a little bit uneven, i could feel little missfires under acceleration.
I replaced spark plugs, then changed coils, it did not help, so i've checked the compression, it was fine so i've bought a new injector (also index 12), i've installed it with brand new seal and coded it.
Car ran perfectly, no codes, smooth under full throtle, basically the issue was gone. Yesterday, i came back from to home, parked the car in garrage, and check engine light appeared.

DTC- 140201 - Cylinder 2 misfire detected: cylinder injection cut out.
DTC -142002 - Misfiring: tank level too low

The car was low on fuel (like 30-40km of range left), but would it be a reason to throw this code? What may be the issue?

The only thing that comes to my mind, is decoupling element on injector 2, i forgot to order it, and used the old one. Is it that important?

Second thing, when i took second injector out, i've noticed it had a little bit of play from left to right, when i've unscrewed it. Also the metal fuel line that goes directly to injector from underneath, i felt like it was a little bit loose (i could turn it a few deegres, with a little bit of force). Should it be like that?

I'll be glad for every advice.
HPFP, common issue. BMW will replace under extended warranty.
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      04-07-2021, 09:55 PM   #3
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Well I have a problem with my transmission in my 2017 650i xDrive convertible. BMW won't replace the torque converter, and I am still under Manufacturer Warranty!
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      04-08-2021, 03:24 AM   #4
leon4822
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Quote:
Originally Posted by AccordTR View Post
HPFP, common issue. BMW will replace under extended warranty.
Unfortunately, where i live (Poland) BMWs with n63 engines are not covered by any extended warranty or CCP, so i'll replace it on my own. Thank you for advice!
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      04-15-2021, 01:55 PM   #5
leon4822
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Quote:
Originally Posted by leon4822 View Post
Unfortunately, where i live (Poland) BMWs with n63 engines are not covered by any extended warranty or CCP, so i'll replace it on my own. Thank you for advice!
So i switched HPFPs (moved bank 2 hpfp to bank and bank 1 hpfp to bank 2) and car ran a little bit better, basically only small missfires while accelerating, no DMF or any codes, but same thing happened when i pulled it back to garage. DMF, code:

DTC- 140201 - Cylinder 2 misfire detected: cylinder injection cut out.

What do you think? Should i replace that pump anyway or it's not the issue? Any ideas?
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      04-15-2021, 03:16 PM   #6
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If the problem exists on the same cylinder then that's would indicate the injector is the problem. Were the Index12 injectors replaced by a BMW dealer? Injector replacement requires precise calibration with ISTA in order for the injectors to function 100%.
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      04-16-2021, 03:46 AM   #7
leon4822
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Quote:
Originally Posted by hugo_nz View Post
If the problem exists on the same cylinder then that's would indicate the injector is the problem. Were the Index12 injectors replaced by a BMW dealer? Injector replacement requires precise calibration with ISTA in order for the injectors to function 100%.
Injectors were replaced by previous owner. I replaced one injector on cylinder 2 wtih index12 myself, coded it with ISTA, and also did injection quanitity compensation. Also I've switched injector 2 and 3 (with new seals ofc), and problem stayed on cylinder 2.

Also, one thing I've noticed - numbers on injectors ale slightly different than the one in ISTA like 593193 is changed to 592192 - I've checked all the numbers, then coded them, and few of those were changed like this by ISTA. is it normal?
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      04-16-2021, 04:45 AM   #8
hugo_nz
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Are all of the injectors index 12? I was advised by BMW that you cannot mix and match index numbers.
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      04-17-2021, 12:47 PM   #9
leon4822
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Quote:
Originally Posted by hugo_nz View Post
Are all of the injectors index 12? I was advised by BMW that you cannot mix and match index numbers.
Yes, all the injectors are index12.
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