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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 03-27-2016, 01:40 PM   #1
Darkstar0304
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Location: Dover, DE
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My Ride: 2001 E46 M3
VANOS intake gear timing

After owning my M3 for a couple months, I decided to do the valve shims and rebuild the VANOS since my friend, who also has an E46 M3, was doing his. We noticed that my VANOS had been removed before as we went along. The VANOS intake gear wasn't fully retarded when we pulled it out (they had missed the first tooth), so we noted that and after finishing up, my car was misfiring on all cylinders, had a rough idle, and on top of the misfiring codes, there was also code P0012 (intake cam over retarded). I bought a new VANOS solenoid, hoping that we somehow messed that up, but same thing happened. When I opened it back up and put the intake gear back one tooth, to where it wasn't fully retarded, the codes went away and its been driving fine since. The previous owner didn't know much about M3s and said he didn't drive it much since he bought it and had only replaced the camshaft position sensor. Could that somehow be why it wouldn't run right with the intake gear fully retarded? Thank you
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Old 03-27-2016, 08:32 PM   #2
jtmiller
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Idk if this will help you at all but i had vanos issues and shop replaced the camshaft position sensor and then within 3 days codes came back and needed to take different measures. I had the intake over retarded and 2 other codes. But once it starts to go it goes. I talked to dr vanos and he said solenoids aren't permanent fixes and just fix issues temporary. You are definitely mechanically inclined if you are trying to fix it yourself. Props to you lol. But to make a long story short my vanos was toast and just bought a refurbished one from dr vanos.
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Old 03-27-2016, 08:40 PM   #3
Cayne23
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Maybe your CPS is calibrated to your vanos intake camshaft gear not being fullu retarded.
What method did u use when removing/reinstalling the vanos? I folled beisans instructions to the letter and have had zero issues since. Maybe try to do an adaptation the CPS
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Old 03-28-2016, 04:13 PM   #4
Darkstar0304
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@Cayne23 I'm not too knowledgeable about the CPS. Do you know if it can be calibrated differently/some way to change the reading? My thoughts were that the first owner had the VANOS redone and put in the intake gear wrong, making it misfire and throw codes so he sold it to the guy I bought it from. Then that guy replaced the CPS making the car think everything was okay, because when I had it fully retarded, the car took it too literally haha
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Old 03-28-2016, 04:51 PM   #5
Cayne23
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I thought there was a way, using DIS, to do an adaptation on the camshaft position sensor.
If it was me, i would set the vanos correctly and buy a new CPS
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Old 03-28-2016, 04:53 PM   #6
NUe46///M
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It's hard to imagine that the word "rotated" would be auto-corrected to "retarded..."
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Last edited by NUe46///M; 03-28-2016 at 04:55 PM.
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Old 03-28-2016, 04:55 PM   #7
Cayne23
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Nope, retarded is correct. The camshafts advance and retard throughout their range of movement

Last edited by Cayne23; 03-28-2016 at 04:55 PM.
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Old 03-28-2016, 05:01 PM   #8
NUe46///M
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My bad, you guys are right. I guess you learn something new everyday...
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Old 03-29-2016, 09:00 PM   #9
Commando
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Assuming you have stock cams I'd suggest someone did not position the crankshaft / camshafts correctly or did not seat the pistons in the VANOS when it was re-installed. The CPS seems like its doing its job. The instructions on the Beisan site lay it all out concisely.
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