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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 09-20-2013, 09:52 AM   #1
ChazHS
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Join Date: Jul 2013
Location: England
Posts: 9
My Ride: 2001 E46 M3
2001 E46 M3 Rough Idle / Shaking

Hello all,

I've posted on this forum a couple of times before, and have actually posted about this issue before!

Essentially, my car had a rough idle and a lot of shaking when idle. It also 'kangerooed' when the clutch was lifted in 1st or 2nd gear without much throttle applied.

I eventually thought I'd traced the fault to a faulty injector, changed it and the problem went away.

To cut a long story short; it's now back! Rough idle and shaking, with the same kangerooing going on. No engine management light and power feels fine once you are above 2500RPM. I have just been out and started the car and can hear a hissing noise near the top of the engine, which leads me to think there is an air leak somewhere. I've also had possible thoughts that maybe my ICV needs cleaning, along with the throttle bodies.

Does anyone have any ideas?

Thanks.
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Old 09-20-2013, 11:38 AM   #2
Alroy
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Rough idling is linked to VANOS.
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Old 09-20-2013, 12:12 PM   #3
m3e46freak
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I would have it read ASAP, hidden problems cause the most damage. Get back to us. Is your fuel pump priming once you turn the key or unlock the door?
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Old 09-20-2013, 12:40 PM   #4
khr0n1x
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My Ride: 2004 CARBON BLACK M3
2001 E46 M3 Rough Idle / Shaking

Check the connection to the vanos. Mine turned out to be a dirty connector and frayed, I fixed it and the idle went away, I also noticed because I have an agency power exhaust, which is a loud grippe m replica... That i could here tiny pops when I put my head near the exhaust and let it idle, which occurred during the vibration. Dirty cable+cloth=fixed idle :p


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| 2004 E46 M3 Carbon Black | Black Interior |
| OEM Short Shift Kit | Depo LED Turn Signals |
| Angel Eye LED's | CSL M3 Style Carbon Splitters |
| VMR V710 Gunmetal Grey 19" |
| Agency Power V1 Exhaust |

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Old 09-27-2013, 07:42 AM   #5
ChazHS
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Well I've had the codes read and have the following:

P0012 - A Timing Over Retarded
P0015 - B Timing Over Retarded
P300 - Random Multiple Misfires Detected
P316 - No description
P1352 - No description
P1525 - No description
P1342 - No description
P1344 - No description
P1346 - No description
P1348 - No description

BMW Specific:

22 - VANOS Exhaust
23 - Injector Coil Cylinder 2
143 - No description
135 - No description

I'm suspecting VANOS problems, is it likely to be the solenoid seals?
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Old 09-27-2013, 02:52 PM   #6
khr0n1x
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My Ride: 2004 CARBON BLACK M3
2001 E46 M3 Rough Idle / Shaking

Check the wire to the vanos solenoid, I fixed that and had the same codes and now I do t throw any anymore, turned out to be shredded from heat/ wear&tear!


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| 2004 E46 M3 Carbon Black | Black Interior |
| OEM Short Shift Kit | Depo LED Turn Signals |
| Angel Eye LED's | CSL M3 Style Carbon Splitters |
| VMR V710 Gunmetal Grey 19" |
| Agency Power V1 Exhaust |

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Old 09-28-2013, 04:00 AM   #7
ChazHS
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Quote:
Originally Posted by khr0n1x View Post
Check the wire to the vanos solenoid, I fixed that and had the same codes and now I do t throw any anymore, turned out to be shredded from heat/ wear&tear!


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I will have a look, where were yours broken out of interest?
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Old 09-28-2013, 04:55 AM   #8
Grinchxvx
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2001 E46 M3 Rough Idle / Shaking

I'm having tanks exact problem and have already replaced my solenoid pack and camshaft position sensor and still nothing has changed. Would be great to find a fix.


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Old 09-28-2013, 08:01 AM   #9
ChazHS
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This morning I had a look at the VANOS solenoid pack and cleaned it out with some carb cleaner whilst actuating the solenoids with a strong magnet. They were very intermittent when I started cleaning them, after cleaning they are much better and click solidly every time.

I've put it back together and it seems a bit better now, definitely smoothed the idle out and power delivery seems better. I also took off the air intake and cleaned out the throttle bodies which were caked in gunk, also did the idle control valve at the same time, which was completely black with gunk as well and very sticky - all cleared up now and idle seems better too.

The problems havent 100% gone, I have ordered some new VANOS solenoid seals online this morning as mine looked pretty shot when I cleaned the solenoid pack out - hopefully that will help.

I'd also really like to bell out the VANOS electrical cables, they seem to disappear off into the injector coil wiring pack right by the fuel rail. Does anybody know where they come out (ideally and enter the ECU) so that I can do a decent electrical continuity test and check there arent any wiring gremlins?

Thanks.
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Old 09-30-2013, 12:51 PM   #10
Grinchxvx
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My Ride: 2001 M3, 1998 M3
2001 E46 M3 Rough Idle / Shaking

Update: I have all the same symptoms as OP but have replaced my vanos coil pack with a beisan unit and have also replaced the camshaft position sensor. Last night I opened up my valve cover and checked the exhaust hub tabs which were intact and also the intake hub bolts which were also all intact.
Still getting p0012 and multiple misfires. Any idea of what's going on.


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Old 09-30-2013, 01:18 PM   #11
choxor
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Be sure to do as he did and clean the solenoid valve body. You should be able to actuate them with a strong magnet. Many people are finding that theirs are stuck. Raj is supposed to be coming up with a cleaning procedure, but I soaked mine in gas overnight then cleaned with brake cleaner.
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Old 09-30-2013, 09:01 PM   #12
Grinchxvx
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2001 E46 M3 Rough Idle / Shaking

Quote:
Originally Posted by choxor View Post
Be sure to do as he did and clean the solenoid valve body. You should be able to actuate them with a strong magnet. Many people are finding that theirs are stuck. Raj is supposed to be coming up with a cleaning procedure, but I soaked mine in gas overnight then cleaned with brake cleaner.
I did the whole brake cleaner with magnet block thing when I got the beisan unit. I just forgot to mention that and I also cleaned the connection that goes to the solenoid pack with alchohol an a Q-tip, still nothing. Maybe a wiring issue that lies deep within the engine bay? All those ribbed plastic hoses that hold the wires are pretty brittle.


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