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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 09-11-2014, 03:12 PM   #1
pompeypete
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M3 Rough idle help....Continued..! :-/

Hi guys, so i wanted to share as i am absolutely at my wits end regarding this issue....! Lets start:

2003 E46 M3 SMG (56500 Miles) and full history. Rough as F*ck when idling....but ok when driving and absolutely NO CODES WHATSOEVER when hooked up to my D900 OBDII scanner. So far i have Cleaned the MAF, ICV and air intakes, Spark plugs seem ok as do the coil packs.......I have also dropped the oil and replaced with new as well as installed a new timing chain tensioner bolt. I have also checked the VANOS filter and o' rings which were also ok. So as you can see i have eliminated quite a lot but i am still at a loss as to what my troubles are....Any help will result in many thumbs up and possibly alcohol to interested parties....!
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Old 09-11-2014, 04:09 PM   #2
DreaM3r
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Fuel pump...?


02 M3 Coupe, no roof, no cold weather package, stick

06 X3
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Old 09-11-2014, 05:02 PM   #3
Stuart
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Instinct is to look for deteriorated hoses on the inlet manifold side - but I guess from what you've written you might have checked already... Is it rough on cold start and also warm - any difference? I sense your frustration!
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Old 09-12-2014, 07:37 AM   #4
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Idle video evidence...!!!

Hi guys, thanks.......Here is a link to the video. Any suggestions...??

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Old 09-12-2014, 07:39 AM   #5
pompeypete
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Quote:
Originally Posted by Stuart View Post
Instinct is to look for deteriorated hoses on the inlet manifold side - but I guess from what you've written you might have checked already... Is it rough on cold start and also warm - any difference? I sense your frustration!
Have a look at the video stuart, it may be hard to tell tbh but it makes no difference regardless as to if its hot or cold....?
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Old 09-14-2014, 07:41 PM   #6
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No photos can be seen.....
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Old 09-15-2014, 09:40 AM   #7
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How to upload photos

Any ideas please so I can add to this thread...??
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Old 09-15-2014, 06:17 PM   #8
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Your TL is an eminently replaceable mass production inaninimate object that doesn't give a sh*t about you.
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Old 09-16-2014, 12:58 AM   #9
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Faults, according to the RAC...

Here you go guys....! any help as always, grateful :-)
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Old 09-16-2014, 03:54 AM   #10
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Update as follows, I plan to replace all coil packs and plugs tomorrow as well as fuel filter. After this I feel that I will be as a loose end other than VANOS....?? Which I'll get from the beisan guys
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Old 09-16-2014, 08:07 PM   #11
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The only codes you show there that aren't intermittent are vanos related, I would start there.

72 48 Inlet VANOS, retard valve
184 B8 Function, inlet VANOS

These frequently point to the vanos solenoid.
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Old 09-16-2014, 09:07 PM   #12
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Check your intake camshaft sensor. Half the time it won't throw a code when it goes bad, but will affect idle.
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Old 09-20-2014, 02:54 PM   #13
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I had succes for less than 1 day....!!! I changed all of my COIL PACKS and SPARK PLUGS and she ran BEAUTIFULLY.....!!! no lag smooth idle and boy was it quick.......then the very next day the same symptoms returned....??? Any ideas guys...?? PLEASE help me so that i don't sell this lovely machine :-(
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Old 09-21-2014, 04:33 PM   #14
CeeBoogie
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It might be the vanos solenoid. My car suffers from that and I'll be getting a new one from besian systems. Check it out, search on google.

Last edited by CeeBoogie; 09-21-2014 at 04:33 PM.
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Old 09-21-2014, 04:40 PM   #15
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So, I have a good (touch wood) update that is very odd.........Ok so this afternoon me and my brother in law started work on replacing the fuel filter (as i had one in the garage) and after we fitted it and we also removed and cleaned the exhaust sensor whilst we were under there and ......guess what.....No difference at all...!! So before we started the repair i phoned the RAC (3rd time in less than a week...!!) why not I'm a paying member! And he plugged in and delivered me a total of 35 faults..! such as misfire on all 6 cylinders and ignition faults amongst the worst......I explained what work we had recently carried out and he too was baffled by the symptoms. so now to the "FIX" so to speak.......Whilst the car was idling badly the RAC tech bloke removed the clip holding the hose going down into the ICV *between the intake and the Injector rail and the car stalled immediately. He covered the hole and i tried to start the car failing until he allowed a little air in through the covered hole which immediately had an impact upon the situation resulting in the car RUNNING LIKE A DREAM.....!!:thumbsu p: the car was then subsequently thrashed for about an hour and turned off. i left it till an hour ago and its still running as sweet as a nut...!! fingers crossed that it stays like this, but my question is now one of confusion: How or what happened to my car...?? its working fine now and to follow up NO CODES AT ALL show on the DIAG software, but i am absolutely baffled by the whole thing......If not at least HAPPY that it is currently running SUPERBLY......Any ideas guys...??
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