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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > cylinder 5 misfires, out of answers



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      08-26-2012, 07:55 PM   #1
saxon
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well i am out of ideas

2007 e90 335i

cyl 5 misfire after:
new plugs in all cylinders
new injector (coded correctly with inpa and has the decoupling element)
new coil
intake walnut blasting

i am out of ideas and I only get the misfire above 6,000 rpm (stock and with procede)

when i installed injectors was i supposed to do anything else besides install and code it into inpa (reset anything etc)

update

2aaf code, thermostat code popped up

anyone think the 2aaf code could have something to do with it?

dealer thinks its dme or valve springs

dme i would have to purchase and hope it fixed the problem to get reimbursed for it
valve springs id be talking $500 in labor to just check them out

Last edited by saxon; 09-20-2012 at 03:26 PM.
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      08-26-2012, 07:57 PM   #2
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Assuming everything was installed correctly, the next possible cause is a bad fuel injector/coil driver in the DME. It may just be better to let the dealership troubleshoot it at this point. Since it happens with the stock tune, they should be able to figure it out reasonably easily.
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      08-26-2012, 08:00 PM   #3
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maybe intake valve clean up
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      08-26-2012, 08:03 PM   #4
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intake cleaning was done, edited my post

car is out of factory warranty and has an aftermarket warranty, i might just pull the procede and dci's and take it to the recommended shop (whom im sure will just send it to bmw)
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      08-26-2012, 08:30 PM   #5
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Isn't there a thread where a bad #5 injector driver was replaced right on the ECU board?

http://www.e90post.com/forums/showthread.php?t=734162

Also could be bad wiring or damaged plug on the injector side or ECU side.
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      08-26-2012, 08:51 PM   #6
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You have the decoupling element on the injector 5?
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      08-26-2012, 09:43 PM   #7
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Quote:
Originally Posted by JamesM3M5 View Post
Isn't there a thread where a bad #5 injector driver was replaced right on the ECU board?

http://www.e90post.com/forums/showthread.php?t=734162

Also could be bad wiring or damaged plug on the injector side or ECU side.
It runs absolutely great until about 6500, then cel, runs in limp mode for a couple second and everything back to perfect

Quote:
Originally Posted by Gfabry View Post
You have the decoupling element on the injector 5?
Yes, it did not have it before though
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      08-26-2012, 10:06 PM   #8
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Is it possible the original decoupling element is still down in the hole? My injectors had the elements on every injector, but they did not have prongs to hold them on the injectors. The new ones do, however. It is possible that 1) the injector decoupler element is still down in the hole, or 2) there was no decoupling element before, the injector bounced around and messed up the hole where the seal resides, and you have a high RPM miss from slightly poor seal.
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      08-26-2012, 10:08 PM   #9
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Quote:
Originally Posted by saxon
Quote:
Originally Posted by JamesM3M5 View Post
Isn't there a thread where a bad #5 injector driver was replaced right on the ECU board?

[intlink]734162;Repairing a 'fried' N54 MSD80 DME[/intlink]

Also could be bad wiring or damaged plug on the injector side or ECU side.
It runs absolutely great until about 6500, then cel, runs in limp mode for a couple second and everything back to perfect

Quote:
Originally Posted by Gfabry View Post
You have the decoupling element on the injector 5?
Yes, it did not have it before though
All of my decouplers were missing at one point. If they are missing, the injector can wiggle and create a problem with the head where it will never be able to seat properly. Dealer and BMW regional dude inspected my head and declared mine was OK but they stated the only repair authorized by BMW when that happens Is a new head.
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      08-27-2012, 11:37 PM   #10
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Don't want to hijack thread but I have a similar problem except it's at idle and unknown which cylinder... Not when cold but when warm... ? Ideas?
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      08-28-2012, 08:05 AM   #11
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Quote:
Originally Posted by =C= View Post
Don't want to hijack thread but I have a similar problem except it's at idle and unknown which cylinder... Not when cold but when warm... ? Ideas?
How many km on your car? Any codes? What have you done to try to troubleshoot it? If it is at idle, there is a "Smooth Running" screen in the diagnostics via GT1 or Autologic that can show which cylinder is acting up. This screen only works at idle, though.

I chased an idle issue that also persisted up to about 2k RPM, light load. Replaced plugs, cleaned intake, cleaned both MAP sensors (which helped significantly, surprisingly), all 6 injectors, and finally both pre-cat O2 sensors. The O2 sensors finally got rid of the problem. I'm running Procede Rev3 with PWM meth, no codes, no problems anywhere else from 2k up to 7k at any load or boost level.
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      08-28-2012, 09:05 AM   #12
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I had similar issues with #6. The dealership diagnosed it as a problem with fuel injector not staying perfectly secure under load (after replacing all the usual suspects). They replaced the cylinder head.
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      08-28-2012, 09:05 AM   #13
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Damaged piston rings.
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      08-28-2012, 12:39 PM   #14
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Quote:
Originally Posted by cstavaru View Post
Damaged piston rings.
Ugh, don't say that. I have a customer car here right now with the same persistent cyl 5 issues:

http://www.e90post.com/forums/showthread.php?t=737425
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      08-28-2012, 04:19 PM   #15
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Quote:
Originally Posted by JamesM3M5 View Post
How many km on your car? Any codes? What have you done to try to troubleshoot it? If it is at idle, there is a "Smooth Running" screen in the diagnostics via GT1 or Autologic that can show which cylinder is acting up. This screen only works at idle, though.

I chased an idle issue that also persisted up to about 2k RPM, light load. Replaced plugs, cleaned intake, cleaned both MAP sensors (which helped significantly, surprisingly), all 6 injectors, and finally both pre-cat O2 sensors. The O2 sensors finally got rid of the problem. I'm running Procede Rev3 with PWM meth, no codes, no problems anywhere else from 2k up to 7k at any load or boost level.
125Km's - Have had the car for roughly 2 months and loving it. I forgot to mention it idles at 600~rpm. It's smooth but you hear a thump from time to time. It's not consistent so it can be heard at any time within 30 secs to a min apart.

Revs stay the same, I watched it carefully this morning every time I stopped at the lights and hear the thump the revs didn't drop. Maybe it's not a misfire???

I haven't done much to troubleshoot it at this point as it only happens on idle's (that I've noticed). When accelerating or decelerating it's fine and I haven't pushed this car yet. I'm still behaving but I love that torque


Is that thump normal or is it something I should be concerned about?

Last edited by =C=; 08-29-2012 at 02:39 AM.
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      08-28-2012, 04:56 PM   #16
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That idle thump you feel was merely an extreme annoyance for me. Once it thumped enough times at idle, it would run at 700+ RPM idle to smooth it out. The DME isn't stupid, and I think BMW took a lot of the misfire monitoring out of the software to head off too many customer complaints from poor idle or other transient misfires.

My idle and low load thumps were cured with new injectors (mine were original 2006 build), cleaning MAP sensors, and new pre-cat O2 sensors. It will do it every now and then at load, but never at idle, and maybe once or twice a week now, not enough to annoy me into pursuing it any further.
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      08-28-2012, 04:58 PM   #17
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Quote:
Originally Posted by saxon View Post
It runs absolutely great until about 6500, then cel, runs in limp mode for a couple second and everything back to perfect
See my other cyl#5 misfire post. I think the DME is reporting the misfire on the wrong cylinder. Seems like a lot of people with cyl #5 misfires. Might want to take a look at all of your plugs and injectors in all the other cylinders to see whether you see anything unusual. The car I'm working on now has what I think to be a bad injector in #1. The plug is half sooty, and the injector tip is uncharacteristically very sooty.
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      09-13-2012, 03:01 PM   #18
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cars been at the dealer now, going on 5 hours @ $100 an hour diagnostic fees
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      09-13-2012, 03:07 PM   #19
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My high RPM misfires were resolved with New Plugs. I replaced ALL six to be safe. I still get a little thump at idle, but nothing worth pursuing as the car drives great....FOR NOW
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      09-13-2012, 07:01 PM   #20
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^^ already done

people please read the thread before adding your .02
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      09-13-2012, 07:09 PM   #21
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^^ already done

people please read the thread before adding your .02
I did read the thread and you wrote 'plug' NOT 'plugs', so I assumed you just replaced a single PLUG instead of all 6 plugs.

Maybe I read too closely
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      09-13-2012, 08:47 PM   #22
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sorry it does say plug, and all plugs were done


just frustrated with this
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