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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Jul-14-2017, 06:08:58 AM   #1
aznbo187
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Default Vanos solenoid and CPS replaced, still getting misfired

Initially pulled codes for P0010/P0012 - "A" Camshaft position actuator circuit/Timing over-retarded.

Then consequently got misfires in all 6 cylinder and a rough idle/drive.

Replaced with Beisan solenoid and that didn't fix it. Replaced both CPS sensors as well and that didn't fix it. Replaced both TPS' as well a short while ago.

My OBD2 reader just took a crap but I'm still getting the same rough idle/misfires - just haven't been able to read the codes. I will this weekend though.

Any idea what it could be? Car is at 125k, 2002. Going to check the VANOS and timing this weekend. Could it be coil related? Fuel filter? Pump? Are there any other sensors that could throw faults?
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Old Fri, Jul-14-2017, 06:43:23 AM   #2
TboneM3
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

A means aus which is out or exhaust. Surprised a new exh CPS didn't fix it since that's what the code seems to be. You didn't touch engine timing recently right? When I hear rough, I think coils.
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Old Fri, Jul-14-2017, 02:45:39 PM   #3
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

I received code p0012 after having the full Beisan parts installed. Had a different shop check it out and it was a timing issue. They re timed it and all is good.
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Old Fri, Jul-14-2017, 04:48:09 PM   #4
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

No change to timing, can that go out of wack by itself? I've only changed the solenoid, so no hub/bolts/discs were touched.
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Old Fri, Jul-14-2017, 05:53:17 PM   #5
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

Do a Vanos test so you can actually see what's not performing
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Old Fri, Jul-14-2017, 06:57:22 PM   #6
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

I'd try cleaning the solenoid valve body really well.
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Old Fri, Jul-14-2017, 08:40:57 PM   #7
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

Hmm, similar sounding issue with my car. 2006, 120k miles. Been throwing VANOS open circuit/camshaft timing codes for a while now (5000+ miles), I'm like 95% sure the connector is bad where it plugs into the solenoid coil pack just under the actuator valve body.

Recently, though (past 100 miles/3 months), the car has been idling roughly and I've been getting misfires on all cylinders plus a random misfire code. The misfire codes all show up at once. I did a bit of searching and there was a thread about if you drive the car short distances in the cold, what can happen is the oil doesn't have time to get up to temperature and won't separate from the crankcase vapors properly, or so I read. The result will be a sludge that blocks up your crankcase vent valve (oil separator) and I was hopeful that was the issue for me, but it didn't seem to be overly blocked. That being said, I couldn't see inside the thing and it was plastic so I didn't want to spray it with brakleen.

I think what I really need to do is just get a new one, and pull off the valve cover and just go at the top part of the engine and clean things out and check clearances and whatnot while I'm in there. Guess that probably doesn't help you all that much since I think my VANOS and misfiring issues are unrelated. -_-
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Old Fri, Jul-14-2017, 09:02:06 PM   #8
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

Quote:
Originally Posted by Drewster View Post
Do a Vanos test so you can actually see what's not performing
What software do I need for this test? Autologic? INPA?

Quote:
I'd try cleaning the solenoid valve body really well.
Followed Beisan's instructions and used magnets + brake cleaner.

Quote:
Hmm, similar sounding issue with my car. 2006, 120k miles. Been throwing VANOS open circuit/camshaft timing codes for a while now (5000+ miles), I'm like 95% sure the connector is bad where it plugs into the solenoid coil pack just under the actuator valve body.

Recently, though (past 100 miles/3 months), the car has been idling roughly and I've been getting misfires on all cylinders plus a random misfire code. The misfire codes all show up at once. I did a bit of searching and there was a thread about if you drive the car short distances in the cold, what can happen is the oil doesn't have time to get up to temperature and won't separate from the crankcase vapors properly, or so I read. The result will be a sludge that blocks up your crankcase vent valve (oil separator) and I was hopeful that was the issue for me, but it didn't seem to be overly blocked. That being said, I couldn't see inside the thing and it was plastic so I didn't want to spray it with brakleen.

I think what I really need to do is just get a new one, and pull off the valve cover and just go at the top part of the engine and clean things out and check clearances and whatnot while I'm in there. Guess that probably doesn't help you all that much since I think my VANOS and misfiring issues are unrelated. -_-
Are you still driving it daily? Mine feels like it's stuck on the low end cam position and after 2.5-3k when it's supposed to switch over it doesn't so it just feels slow throughout the range.
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Old Fri, Jul-14-2017, 10:43:08 PM   #9
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

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Originally Posted by aznbo187 View Post
What software do I need for this test? Autologic? INPA?
Either should be fine. You essentially need to see if the Vanos is *trying* to actuate, can't actuate, or is out of time - which you can tell from a Vanos test result
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Old Fri, Jul-14-2017, 10:48:39 PM   #10
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Default Re: Vanos solenoid and CPS replaced, still getting misfired

Could be the solder joints in the solenoid going bad as well. Get the rebuilt one from Beisan.
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