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Help! RPM fluctuates!!
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12-28-2005, 05:33 PM | #1 |
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Help! RPM fluctuates!!
hey guys!! my 330i auto currently has 4800 miles. and somehow the RPM needle is VERY unstable! it moves up and down about 100 rpm when its idle with a/c off sometimes, and with a/c on ALL of the time. when i'm accelerating, i feel like the rpm is shakey too!! also when i set my car on cruise control, the rpm needle has the same effect as the idle movement, it moves up and down abruptly around 100 rpms up and down!! i'm sure this is coming from the engine instead of just a unstable tachometer. please help me and tell me what problem it is or if you have had the same situation!! Thank you guys so much for the help!!
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12-28-2005, 06:59 PM | #2 | |
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12-28-2005, 07:23 PM | #3 |
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A qualified BMW dealer can answer this and fix it (but you knew that )
Could be idle control valve, could be a VANOS issue too, or a intake/exhaust cam timing problem, or a vacuum issue. Are using 91+ octane feul (without mixing any grades) ? |
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12-28-2005, 07:26 PM | #4 | |
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12-28-2005, 08:46 PM | #6 |
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thx for the responses guys! ya i'm running on 91 for every mile of this car, but from different gas stations. this makes me wonder if i should still install the K&N air filter...
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12-28-2005, 10:55 PM | #7 | |
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I an VERY weary of changing the air filter. Not sure if it such a good idea. Make sure you check to see if the cover needs a gasket or sealent once the filter is replaced. All the best in your endeavours.
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12-28-2005, 11:23 PM | #9 |
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This hasn't happened to me or I haven't noticed anything like this yet. I would recommend that you take it to your dealer to get checked out..
Good luck
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12-29-2005, 03:08 AM | #11 |
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no offense to anyone here...but if that happens to you wouldnt you just take it to the dealer??? I mean sure you can get opinions here but in the end you still have to take it there.
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12-29-2005, 04:53 AM | #12 | |
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But then the forum wouldnt enlighten anyone about anything and it would be just people talking about how much they love/hate their E90. I've notice my rpm vary a bit, and thought it was somewhat abnormal. It did phases of a 10 seconds high, then a few low, around the 600 to 800, dont remember exactly where.
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01-04-2006, 01:02 PM | #14 | |
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01-05-2006, 06:34 AM | #15 |
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The last thing that I would recommend is to replace the stock air filter element with an oil wetted element prior to complaining about idle fluctuations! The second to last thing I would do is replace the factory type treated/pleated paper air filter element with an oil wetted element on a street vehicle, ever!
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01-05-2006, 07:32 AM | #16 |
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i do know whenever the engine is started, it will start a bit above 1k rpm and slowly moves back down and a little bit of swing. i am sure it is nothing abnormal.
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01-05-2006, 08:50 AM | #17 | |
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01-06-2006, 12:34 AM | #18 |
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Got the same problem with my 320i. The fluctuation is always there, cold start or warm engine, with or without A/C. However I did not notice any changes to engine performance. Brought it back to the agent and they could not determine what cause the problem. Only thing they said was this problem exist on some E60 engines and suggested that I ignore it and leave it alone since it does not affect performance. Almost told him to go to hell, but that was right after Christmas. What if the engine died on me after the warranty period? After much complaints, the manager promised to investigate and get back to me in the New Year (hope its 2006). New Year resolution - kick some asses in BMW till they resolves the wind noise, squeaky wipers and the fluctuating RPM.
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01-06-2006, 07:29 AM | #19 | |
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06-24-2006, 01:15 AM | #20 | |
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Regards, seahawk |
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06-24-2006, 04:42 AM | #22 |
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after about 3 months i noticed my car was running a little rough, and on cold starts, the rpm would fluctuate
during my service, the dealer updated my software (for which they kept the car overnight - does it take that long !?) now it runs very smoooth again and seems to be more torquey in the 1000-2500 rpm range havent revved it right up since the service, but will once i get the change =) |
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