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Default 335i N54 stumbles at idle after all oem upgrades - 11-16-2017, 02:36 PM

Ok so I've been spending a lot of money to try and fix this problem and can't seem to figure it out yet. I have a 2009 E92 X Drive 6MT with 67k miles which is low for the year. I started having a rough idle at cold start and it progressively got worse until white smoke started coming out of the exhaust that smelled like gas. So I decided to replace all 6 spark plugs with bosche then 6 coils with Delphi. Still had same problem so I took it to the dealership for a diagnostic. They told me my injectors had to be replaced and if that doesn't work to do a walnut carbon blast. So I replaced all 6 injectors with index 12 ones and calibrated them. Car seemed to be running good for awhile. I noticed that when at idle I'd get a noticeable "stumble" the rpms wouldn't be jumping like crazy, the needle stays pretty stable 800rpm but the stumbling is noticeable only when standing still. When I drive normally it drives perfect and holds vacuum. So i noticed my valve cover gasket was leaking and there was oil in the 2nd and 3rd plug bay so I took out both coils and plugs that were covered in oil and replaced them with new ones and cleaned the ports. I thought that HAD to be the problem but the car still "stumbles" at idle. The other cylinders seemed to be clean When I checked. I'm running MHD but am at stock 0 tune for the winter and reset all adaptations just in case. Please help, I'm running out of money I want to put in this car and the problem wonnt go away. It doesn't throw ANY codes either for misfiring or anything so it's subtle enough to not throw codes but still very noticeable from the bottom of my seat. Thanks in advance for reading the long explanation I wanted to be as thorough as possible.
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Default 11-16-2017, 06:45 PM

The guy could be right about the walnut blast.


Good news for you is that you haven't wasted money per se, as everything you've done is good maintance and/or needed it anyway.


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Default 11-16-2017, 07:46 PM

Sorry forgot to mention I got the walnut blast done too and they weren't that bad for the first time in 66k miles. I literally can't think of anything else that could be causing the issue. Maybe replace the other 4 coils and plugs in case one of them is faulty? Or maybe one of the new injectors is faulty? But without actual misfire codes I'm just totally guessing which one. Everything runs and drives like a dream besides the small engine stumble/stutter at idle. Maybe the oil leak went past the plugs and is causing the issue directly in the combustion chamber, even though I cleaned as best as I could.
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Default 11-16-2017, 09:32 PM

What codes are you getting, exactly?


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Default 11-17-2017, 01:19 AM

No codes at all, it's a slight almost misfire but no code ever registers or no check engine light at all. That's why I can't seem to isolate the problem
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Default 11-17-2017, 03:10 AM

I have also had a similar situation. The cause was the replacement Bosch spark plug. No matter what I did, small idle misfires did not improve and I was bothered by a year. We improved after replacing the spark plug with a BMW genuine product.


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JB4 G5 IOS MHD race flash MMP High flow aluminum intake MMP Hot side inlet Down pipe Outside intercooler Twin oil cooler cp-e charge pipe BMS meth kit turbo lab stage 1 turbo CSF radiator fuel-it stage 1 pump
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Default 11-17-2017, 08:30 AM

Quote:
Originally Posted by naoaki
I have also had a similar situation. The cause was the replacement Bosch spark plug. No matter what I did, small idle misfires did not improve and I was bothered by a year. We improved after replacing the spark plug with a BMW genuine product.
I'm starting to think you could be right. I got the oem (or is it oe?) Bosch plugs from FCP Euro which nobody seems to have issues with and have a lifetime warranty on them. Maybe it's the MHD tune that doesn't like the plugs? Even though it's just on stock power. Would it be better to just upgrade to the NGK ones or you truly believe genuine BMW plugs are the best solution? Thanks for the reply I really appreciate it!
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Default 11-17-2017, 08:47 AM

Fix the problem?
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ms335i ms335i is offline
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Default 11-17-2017, 08:48 AM

Does it sound like this?

https://www.youtube.com/watch?v=fY9wqd7eXg0
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Default 11-17-2017, 11:40 AM

Quote:
Originally Posted by Volcanofordays
I'm starting to think you could be right. I got the oem (or is it oe?) Bosch plugs from FCP Euro which nobody seems to have issues with and have a lifetime warranty on them. Maybe it's the MHD tune that doesn't like the plugs? Even though it's just on stock power. Would it be better to just upgrade to the NGK ones or you truly believe genuine BMW plugs are the best solution? Thanks for the reply I really appreciate it!
I had the exact same problem (2010 535ix 62k) after putting in new OEM BOSCH plugs and a walnut blast.

Replaced the plugs with NGK's and the stumble went away.
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Default 11-17-2017, 10:50 PM

I have this exact problem. I will try NGK's soon...
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Default 11-18-2017, 02:40 PM

and the plugs are clean and dry?
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Default 11-18-2017, 02:43 PM

Yeah i checked all of them and only cylinder 2 and 3 had oil on them so replaced those. I ordered NGK plugs to hopefully fix the issue thanks a lot for the suggestions you guys are great! Will update next week
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Default 11-18-2017, 03:05 PM

Monitor your o2 sensors. This sounds exactly like one is failing.
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Default 11-20-2017, 12:09 AM

Could it be the blow off valve or the diverter Valve. When I install turbosmart diverters you could twist it to cause the idle to get low and stumble. just a thought, good luck
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Default 11-20-2017, 08:11 AM

I purchased a set of "new" index 12's and chased a stumbling idle for six months, turns out my injectors were crap. Also only use bmw genuine plugs or ngks, ive had issues with supposed oem ones, also coils need to be bmw. Personally my car with 88k did not improve after a walnut blast even though it was pretty crudded up.


08 335i 6AT FBO(No inlets or outlets) E40 MHD OTS tune, H&R sport springs, 11.82@118mph with a 1.7 on 245/40 18 hoosier dr's with ots e40 mhd flash
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Default 11-20-2017, 03:04 PM

Quote:
Originally Posted by Cynical
Monitor your o2 sensors. This sounds exactly like one is failing.
Really? I think there would definitely be an error code or two associated with failing sensors (I've had them, got 2-3 different codes re: fuel mix, 02 signal, 02 heating, etc.) - especially if it's bad enough to cause stumbling (mine did not).


OP- maybe fuel injector leaking causing stumbling? (this would be less likely to throw codes, as in your case)

possible this is a vanos issue?


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Default 11-20-2017, 06:16 PM

Quote:
Originally Posted by Volcanofordays
I'm starting to think you could be right. I got the oem (or is it oe?) Bosch plugs from FCP Euro which nobody seems to have issues with and have a lifetime warranty on them. Maybe it's the MHD tune that doesn't like the plugs? Even though it's just on stock power. Would it be better to just upgrade to the NGK ones or you truly believe genuine BMW plugs are the best solution? Thanks for the reply I really appreciate it!
At that time I was using JB 4 only. After exchanging the spark plug with Bosch (not BMW genuine) it caused a strange idle up and a small misfire without a fault code. I tried various improvements I really tried various things I exchanged parts related to walnut blowing and O2 sensor replacement and banos solenoid replacement and injector replacement and misfire but did not improve but when I replaced the spark plug with a BMW genuine product completely solved. The aftermarket's Bosch spark plug is not compatible with N 54


BMW 2007 E90 335i
JB4 G5 IOS MHD race flash MMP High flow aluminum intake MMP Hot side inlet Down pipe Outside intercooler Twin oil cooler cp-e charge pipe BMS meth kit turbo lab stage 1 turbo CSF radiator fuel-it stage 1 pump
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Default 11-21-2017, 10:13 AM

Where did you buy your injectors?


08 335i 6AT FBO(No inlets or outlets) E40 MHD OTS tune, H&R sport springs, 11.82@118mph with a 1.7 on 245/40 18 hoosier dr's with ots e40 mhd flash
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Default 11-21-2017, 10:29 AM

Quote:
Originally Posted by ms335i
Very similar but I wouldn't say its that bad. Still noticeable but id say about half as intense.
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Default 11-21-2017, 10:31 AM

Quote:
Originally Posted by naoaki
At that time I was using JB 4 only. After exchanging the spark plug with Bosch (not BMW genuine) it caused a strange idle up and a small misfire without a fault code. I tried various improvements I really tried various things I exchanged parts related to walnut blowing and O2 sensor replacement and banos solenoid replacement and injector replacement and misfire but did not improve but when I replaced the spark plug with a BMW genuine product completely solved. The aftermarket's Bosch spark plug is not compatible with N 54
Thanks for the info Naoaki. You convinced me this has to be the issue. Getting the new plugs tomorrow. Will update asap! Thanks again for all the replies, you guys are great!
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Default 11-21-2017, 10:32 AM

Quote:
Originally Posted by RevvAutoBmws
Where did you buy your injectors?
I bought them for FCP Euro, same with the plugs and coils. I just couldn't pass up that lifetime replacement warranty
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Default 11-21-2017, 10:43 AM

This really sounds like a bad injector to me, can you let us know where you purchased them at?


08 335i 6AT FBO(No inlets or outlets) E40 MHD OTS tune, H&R sport springs, 11.82@118mph with a 1.7 on 245/40 18 hoosier dr's with ots e40 mhd flash
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Default 11-21-2017, 11:02 AM

Quote:
Originally Posted by RevvAutoBmws
This really sounds like a bad injector to me, can you let us know where you purchased them at?
Yes I got everything from FCP Euro:
BMW Fuel Injector - Genuine BMW 13538648937
BMW ZGR6STE2 Spark Plug - Bosch 0242140507
BMW Direct Ignition Coil - Delphi 12138616153
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Default 11-22-2017, 11:11 AM

Sorry I must have posted and not seen your reply


08 335i 6AT FBO(No inlets or outlets) E40 MHD OTS tune, H&R sport springs, 11.82@118mph with a 1.7 on 245/40 18 hoosier dr's with ots e40 mhd flash
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