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BMW 3-Series (E90 E92) Forum
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Rough Idle, stumbling rpms
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11-27-2011, 08:04 AM | #46 |
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Done around 500 miles since the reset and it's still bad so looks like this is not the fix. Kinda at a loss, any other suggestions?
Had both vanos solenoids replaced yesterday also. |
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11-28-2011, 12:19 PM | #47 |
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Well sh!t
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11-28-2011, 04:00 PM | #48 | |
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Quote:
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11-28-2011, 04:34 PM | #49 |
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have you had your valves cleaned?
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12-04-2011, 05:34 PM | #50 |
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Bump...
Anyone got anywhere with this yet? Definatley not valves as I had a full head off decarb recently. Also disconeted the battery over night & reset ecu with the BT cable with no improvement to the rough idle. Under load it's smoother after the ecu reset so not all bad!! |
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12-04-2011, 08:15 PM | #51 |
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I think mine's getting worse.
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12-05-2011, 11:02 AM | #52 | |
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Hope it useful for you. |
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12-05-2011, 11:23 AM | #53 | |
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Thanks for the suggestion but i already had my low pressure fuel sensor replaced 6 months ago and it didn't solve the issue. Is that the same one you replaced? |
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12-05-2011, 12:10 PM | #54 |
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12-05-2011, 12:16 PM | #55 |
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Interesting.
The hunt continues... |
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12-05-2011, 04:25 PM | #56 |
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Someone correct me if I'm wrong but I'm pretty sure the sensor for the hpfp is actually part of the pump itself and can't just be swapped out, you'd need to replace the whole thing.
Im pretty sure the only sensor thats fuel related and an easy replacement is the low pressure fuel sensor. |
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12-07-2011, 06:49 PM | #57 |
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I have this same issue. Mainly at startup in the morning and it runs rough for about a mile of driving. Then at idle I get the RPM jumps sporadically.
My techs have replaced injectors/swapped coils/replaced coils and even cleaned out ALL of my valves. (which were pretty bad) The car runs better after all of that but I still get the terrible stutter every morning as if the car isn't getting enough gas. I'm dropping it off Friday (Dec 9th) and they are having a BMW engineer get involved. I have a PROcede installed but haven't had it turned on in over a month to completely rule it out as being a cause. I'll be sure to report back!
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12-07-2011, 07:25 PM | #58 |
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had it happen once seems like a common problem you should all write letters to BMW head office and ask them too look into it, i think its unfair that so many of you are wasting all that time and money trying to solve on your own.
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12-07-2011, 08:52 PM | #59 | |
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I've been dealing with the same issues. Thanks to the OP I have saved thousands of dollars as I was about to go down the same route replacing the injectors / coils and so forth. My rough idle seems to have gotten better in the cold weather for whatever reason. What I'm dealing with now is after a couple of minutes at idle the car forgets what rpm to idle at and creeps up to 800 or so without being prompted by a stumble. Part of the crew.... never had a misfire or code but rough idle.
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12-08-2011, 08:39 AM | #60 |
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I had idle misfires even when I bought the car and was completely stock.
I replaced spark plugs and cylinder 4 coil at 24k km and all misfires disappeared. When I used NLS a week ago misfires came back. I'll replace cylinder 5 and 6 coils tomorrow and get some feedback. |
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12-08-2011, 08:41 AM | #61 |
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Seems like a growing number of us out there. haven't had too much of an issue this week. It does seem to get worse in wet/humid weather. It's been cooler and dryer this week (save for yesterday), and I've had only minor hiccuping.
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12-08-2011, 10:03 AM | #62 | |
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Doesn't seem like there is going to be ONE magical fix for everyone's issue.
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12-22-2011, 01:20 PM | #63 |
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UPDATE: So I told yous I would let you know what fixed my issue.
ALL OF THIS WORK WAS DONE UNDER WARRANTY (even valve cleaning) 1st Visit: Coils swapped from cylinder to cylinder to attempt to isolate fault. Would return next day with SES light. 2nd Visit: Fault thought to be isolated to a coil. Coil swapped out with new coil. SES light back on 2 days later. 3rd Visit: Fault thought to be an injector. Injector was swapped out. SES light back on next day. 4th Visit: Had the valves blasted with walnut shells and another injector replaced. Car ran much better but still very noticeable shake, rough drive every morning. 5th Visit: ALL injectors replaced. Issue seems to be completely gone. On Day 4 now with no start-up issues, no rough idle, no rough acceleration. However, it has been VERY warm these past few mornings (55+ degrees) and my issues occurred when it was colder in the morning. I'll keep yous posted if the issue comes back. If not, assume all is well! Hope this helps someone...
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12-22-2011, 02:57 PM | #64 |
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I believe I have the issue as well. Can feel the car missing at idle, mostly when engine cold and starting it in the morning. However once the RPMs come up while driving no misses at all, and completely fine under load.
No SES light. |
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12-22-2011, 04:42 PM | #65 |
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I have the same issue when the car is at a stop. You can feel a slight bump. Hasn't thrown a code yet and occurred about 2 weeks after I installed all new Bosch plugs and had an oil change.
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12-22-2011, 04:53 PM | #66 |
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My car started off with idle rough, and no misfire codes. Idle rough went away after engine warmed up.
After 1 year, my car now idles rough on cold start AND is guaranteed to throw a misfire code (cyl 2) after 10-20 secs. Swapped coils, changed plugs, so only thing I didn't do was replace injectors.
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