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BMW 3-Series (E90 E92) Forum
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cylinder 5 misfires, out of answers
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08-26-2012, 07:55 PM | #1 |
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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 itvalve springs id be talking $500 in labor to just check them out Last edited by saxon; 09-20-2012 at 03:26 PM.. |
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, 09:43 PM | #7 | |
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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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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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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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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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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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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, 03:07 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, 07:09 PM | #21 |
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