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R56 12 MCS P0012 and P0303

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Old 12-03-2015, 03:51 PM
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12 MCS P0012 and P0303

Left the house today, 2 blocks away, and engine light came reduced power. Got home pulled these codes.
P0012 timing over retarded and
P0303 cylinder 3 misfire.
Havnt tried to clear and drive yet.
I tried doing a quick search here and google, found a little but it seemed to be all with the n14 engine.
Few questions, is it more likely that this is 2 different problems? Or that the P0012 problem is causing the misfire code, like a vanos solenoid?
Any advice?
the n18 engine doesn't have timing chain issues like the n14 right?
The car has 50k miles on it now.
Thanks very much
Jeff
 
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Old 12-03-2015, 04:29 PM
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You have a '12 with the n14 engine? Is it a JCW? Anyways, had a similar problem with our '12 MCS (non JCW with n18 engine), it was a VANOS solenoid, I think the exhaust side..
 
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Old 12-03-2015, 04:36 PM
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Originally Posted by AZdsrt
You have a '12 with the n14 engine? Is it a JCW? Anyways, had a similar problem with our '12 MCS (non JCW with n18 engine), it was a VANOS solenoid, I think the exhaust side..
No it is the n18 engine in it. Would it be the exhaust side? Or wouldn't it throw a P0014 code for the exhaust vanos?
Thank you
 
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Old 12-03-2015, 04:43 PM
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Ah, I just re-read your OP, I obviously read it too quickly. Anyway, could be a lot of different things. I don't remember what codes I got when the VANO solenoid died, but I'd be willing to bet that the two codes you have are caused by the same problem. Hopefully someone will chime in that is more familiar with those two codes.
 
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Old 12-03-2015, 09:03 PM
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Originally Posted by AZdsrt
Ah, I just re-read your OP, I obviously read it too quickly. Anyway, could be a lot of different things. I don't remember what codes I got when the VANO solenoid died, but I'd be willing to bet that the two codes you have are caused by the same problem. Hopefully someone will chime in that is more familiar with those two codes.
Thanks for the quick reply,
This weekend I'll try to pull the intake vanos solenoid, and clean it, see if that helps.
 
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Old 12-03-2015, 09:18 PM
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I'd try swapping coils cyl 3 and see if the code follows. Also inspect and swap plug if the coil swap doesn't work.
 
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Old 12-04-2015, 08:30 AM
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We go over some information about the N18 VANOS in our DIY that may be helpful to you with this process. As suggested in the article, if you have determined you need a VANOS solenoid by cleaning or swapping side to side, replace both solenoids.

 
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Old 12-04-2015, 10:12 AM
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Originally Posted by PelicanParts.com
We go over some information about the N18 VANOS in our DIY that may be helpful to you with this process. As suggested in the article, if you have determined you need a VANOS solenoid by cleaning or swapping side to side, replace both solenoids.

Ok swapped cylinder 3 coil with cylinder 2 and pulled the exhaust side vanos sol. The solenoid was spotless. Reinstalled, cleared codes no change, has a dead miss all the time, and now it just sets a p0012, And a p0000. I'm assuming the p0000 is generic for a mfr. Specific code which my scan gauge can't show me. After pulling the exhaust vanos, I realized that p0012 refers to intake side correct? P0014 would set for exhaust side correct? And if I swap intake and exhaust side vanos, and the intake side is bad, it should then set a p0014 correct?
Thank you guys for the help
 
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