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08-03-2012, 01:05 PM | #1 |
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Idle Issues?
Hey all,
I have a 2009 128i w/ auto transmission that I bought a few months ago with 32000 km's and now it has about 36000 km's on the clock. I've noticed that since I bought it, I've been experiencing an odd sensation at idle. The car idles smoothly at around 650-750 rpm but when I am stopped at a stop light with the car in drive, there is a slight dip in the RPM (just above 600) for a couple of seconds and there is a vibration in the steering wheel and through the seat. The engine note also becomes a slightly lower frequency. This seems to cycle on and off every few seconds when the car is at a stop, and the vibration is less intense with the AC on (the idle RPM is also slightly higher). There doesn't seem to be a difference between cold start and when the car is warm, and otherwise there is no vibration at any other time. There is no hesitation or engine pinging at any time, and the car accelerates very smoothly. There are no CELs or any odd noises. I only use Shell V-power and just put in a bottle of STP fuel injector cleaner. By googling, I found that this seems to be a common occurrence with the N52 engines even when they are fairly new, and I just wanted to ask if this is something I should be worried about? Has anyone else experienced this in the past? Thanks in advance. Last edited by youngdoc1; 08-03-2012 at 02:01 PM.. |
08-03-2012, 02:04 PM | #2 |
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Could be cause from the electrical draw from the fan causing the the rpm's to drop slightly and the car cooling off while at a stop and then oes back to nowmal when the fan kicks off. My only logical guess. Seems pretty normal for all cars. You will have some type of feedback like this on all cars really.
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08-03-2012, 04:35 PM | #3 | |
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Any other thoughts? |
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08-03-2012, 05:34 PM | #4 |
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Spark plugs. They are cheap and make a huge difference on how the engine idles and performs. Even though they can last 100K... I certainly would not run them that long. I would also pay close attention to your coil pack connectors when you R&R the plugs.
You could also ask your dealer... maybe there is a new-er SW to address this issue? And of course when all else fails... we blame it on carbon buildup! Dack
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08-03-2012, 07:49 PM | #5 | |
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08-03-2012, 08:19 PM | #6 | |
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As for normal feedback, i wouldnt expect normal engine vibration at idle to make the whole car vibrate like a massage chair. I've also driven several other bmw's, including another 128i and a 328i, and neither gave me this kind of vibration when i was waiting at a stop light. I will get it checked out this tuesday and keep you guys updated. Thanks for the advice! |
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08-03-2012, 11:24 PM | #7 |
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Im no expert so I won't claim to be. I got my 135i back today from the dealer. I was noticing a rough idle while at a stoplight as well before I took it in but I had other issues with it as well. They replaced the high pressure fuel pump. I have to take it back again tomorrow because im not sure if they fixed the problem all the way or just caused another issue.
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08-11-2012, 06:49 AM | #8 |
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Hey,
So after a few hours at the dealership and not finding any faults with the engine, techs increased idle rpm levels slightly and problem is solved! Thanks everyone for your advice. |
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