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BMW 3-Series (E90 E92) Forum
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100rpm Surge/fluctuation at Idle
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| 07-29-2016, 10:05 AM | #1 |
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Captain
 
175
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100rpm Surge/fluctuation at Idle
Should a 100rpm fluctuation be something to be concerned about? I can feel it when at a stop occasionally. My conclusion was I'm due for a walnut blast since I'm at 48k. I was going to do it at the 50k interval.
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| 07-29-2016, 11:40 PM | #3 |
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Private First Class
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Rep 158
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Drives: White Buffalo
Join Date: Oct 2015
Location: Kirkland, WA
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when the plugs/coil packs are needed will the car throw any sort of code?
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| 07-30-2016, 02:03 AM | #4 |
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Lieutenant Colonel
 
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Rep 1,652
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Drives: '10 AW/CR e92 6mt 335i
Join Date: Mar 2012
Location: Chandler, AZ
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Could be so many things but I had a similar issue that went from slight rpm drop at idle to almost stalling when i didnt look into it for a while. If you googled a bit I saw a lot of stuff come up.
Some said carbon buildup, some said injector issues can cause it too. Mine ended up being injector. I figured out which bank was having issues by watching AFR's. Since the injector was bad one bank had AFR's not consistent with he other. And the issue was also only at idle. I think mechanic said something like it was clogged a little bit.
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