2008 328i 204K Idle mis/shutter No CEL Intermittent

paco89 · 01-06-2017, 11:10 PM

Hey guys, any thoughts will be appreciated!

Recently purchased an 08 328i with 204k for a great deal. Drives fine.

Needs: Front shocks, Valve cover gasket, possibly coils.

Issue: Today after driving it for a bit, when slowing down I started noticing that the RPM's would drop to under 500 RPM before coming to a complete stop and then going back up to 650 RPM and stay there steady.

When reaching my destination I parked and put the car in Park. The car started missing/shuttering at a speed of every second fluctuating RPM's between 500-650RPM, up and down. When I stepped on the gas pass 650 RPM's it would just rev normally without hesitation. Once letting off the gas, shutter would return.

I turned the car off and went inside a store. Came back and drove back home, the fault did not come back. No check engine light to all of this.

When starting the car every time I notice a slight miss right at start up. Nothing as as bad as the shuttering that happened at the store.

My thoughts: Car does seem to need an engine mount, however this was not the cause for that type of shutter. Talked to original owner who had the car until 203K and he never replaced coils, he checked resistance on them and checked out good. He did replace spark plugs at 160K. This car has all receipts from the dealer. No major repairs, all maint. up to date, except VCG.

My question: Has anyone here had a coil begin to go bad or go bad without triggering the service engine light? Yes- they can go bad and present symptoms differently, have seen coils go bad and become noticeable only at WOT.

Thank you! Any thoughts are welcome!

tlow98 · 01-07-2017, 12:29 AM

Buy a code reader for BMWs. About $100 for software and hardware combined. It will more than likely pinpoint the issue for you.

Carly is a good one

6ixSpd · 01-07-2017, 12:41 AM

Sounds much more like an idle issue than a bad plug/coil.

ctuna · 01-07-2017, 01:46 AM

Plugs coils (oil in plug wells due to leaking VCG)
clean vanos solonoids or replace .(easy)
oil in eccentric shaft sensor.(or bad)
check air filter

See DIY's

F22_Raptor · 01-07-2017, 03:45 AM

Sounds like a fouled Eccentric Shaft Sensor

Shotputted · 01-07-2017, 05:33 AM

My N51 did this on and off a few times until a code finally showed up. Was a bad coil.

STR8-6IX · 01-07-2017, 10:36 AM

Im not entirely sure what can cause this because the BMW's dont have a throttle body, but it could be something with the idle air control that needs to be cleaned.

i would start with changing injectors, ignition coils, doing a full tune up and also changing out the air filter and see if that helps.

01-06-2017, 11:10 PM	#1
paco89 Captain 142 Rep 726 Posts Drives: 2006 325xi Arktis Metallic Join Date: Jul 2014 Location: Minnesota iTrader: (0)	2008 328i 204K Idle mis/shutter No CEL Intermittent Hey guys, any thoughts will be appreciated! Recently purchased an 08 328i with 204k for a great deal. Drives fine. Needs: Front shocks, Valve cover gasket, possibly coils. Issue: Today after driving it for a bit, when slowing down I started noticing that the RPM's would drop to under 500 RPM before coming to a complete stop and then going back up to 650 RPM and stay there steady. When reaching my destination I parked and put the car in Park. The car started missing/shuttering at a speed of every second fluctuating RPM's between 500-650RPM, up and down. When I stepped on the gas pass 650 RPM's it would just rev normally without hesitation. Once letting off the gas, shutter would return. I turned the car off and went inside a store. Came back and drove back home, the fault did not come back. No check engine light to all of this. When starting the car every time I notice a slight miss right at start up. Nothing as as bad as the shuttering that happened at the store. My thoughts: Car does seem to need an engine mount, however this was not the cause for that type of shutter. Talked to original owner who had the car until 203K and he never replaced coils, he checked resistance on them and checked out good. He did replace spark plugs at 160K. This car has all receipts from the dealer. No major repairs, all maint. up to date, except VCG. My question: Has anyone here had a coil begin to go bad or go bad without triggering the service engine light? Yes- they can go bad and present symptoms differently, have seen coils go bad and become noticeable only at WOT. Thank you! Any thoughts are welcome! __________________ 2006 Bmw 325xi VMR V715/OE lip/Redlines/Zsp Springs 1999 Eclipse Spyder Gst 16g/264cams/550cc/255lph/corbeau seats/Comp Stage 4 Clutch/ECUflash etc...
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01-07-2017, 12:29 AM	#2
tlow98 Major General 2191 Rep 5,007 Posts Drives: 2009 E91, 2014 F15 x35i Join Date: Aug 2011 Location: Bay Area iTrader: (2)	Buy a code reader for BMWs. About $100 for software and hardware combined. It will more than likely pinpoint the issue for you. Carly is a good one
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01-07-2017, 12:41 AM	#3
6ixSpd Save the manuals! 6019 Rep 6,750 Posts Drives: '16 M3, '23 718 Spyder Join Date: Feb 2016 Location: 416 iTrader: (4)	Sounds much more like an idle issue than a bad plug/coil. __________________ '16 M3 \| '23 718 Spyder Past: E92 M3, F87 M2, E39 M5, etc
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01-07-2017, 01:46 AM	#4
ctuna Lieutenant General 1917 Rep 13,109 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Plugs coils (oil in plug wells due to leaking VCG) clean vanos solonoids or replace .(easy) oil in eccentric shaft sensor.(or bad) check air filter See DIY's
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01-07-2017, 03:45 AM	#5
F22_Raptor Lieutenant 118 Rep 424 Posts Drives: 2008 328i Join Date: Aug 2015 Location: Touring CA iTrader: (0)	Sounds like a fouled Eccentric Shaft Sensor __________________
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01-07-2017, 05:33 AM	#6
Shotputted Private 15 Rep 49 Posts Drives: 2011 E90 335i Le Mans Blue Join Date: Aug 2015 Location: FL iTrader: (0)	My N51 did this on and off a few times until a code finally showed up. Was a bad coil.
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01-07-2017, 10:36 AM	#7
STR8-6IX Banned 537 Rep 2,825 Posts Drives: RWD 528i N52 Join Date: Nov 2016 Location: Toronto iTrader: (0)	Im not entirely sure what can cause this because the BMW's dont have a throttle body, but it could be something with the idle air control that needs to be cleaned. i would start with changing injectors, ignition coils, doing a full tune up and also changing out the air filter and see if that helps.
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