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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 11-15-2012, 10:04 PM   #1
Big john (972)
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Car misfire, need help, please.

Need help guys, please..... I have a 2003 m3 been running like crap. I have misfire sender 1 through 6. I'm using OBD 2 scanner made from blue point YA31000. Here are all my code are showing. P0301, P0302,P0303,P0304,P0305,P0306,P0300 random misfire,P0012 intake camshaft position timing over-retarded bank1,P0010 intake camshaft position actuator circuit/open bank1. So I've changed the exhaust and intake cam sensor. And another thing is when I use the scanner to clear the service engine light. The car runs fine for a week, and then the light come back on again. If anyone out there have the same problem PLEASE help. Oh and another thing, could it be my 02 sensor is going bad?
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Old 11-16-2012, 01:17 AM   #2
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I cannot accurately say, but maybe the VANOS solenoid? It may not be actuating the intake cam and therefor causing bad timing. The solenoid with broken solder points also exhibits intermittent faults as the connections may be maintained for a while, but then jolted open at some point and producing error codes again.

Although could be other things. I had similar issues (exhaust cam) and it was the VANOS itself, which was a rather expensive repair.
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Old 11-16-2012, 04:32 AM   #3
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About your O2 sensor(s), hopefully your scan tool is capable of capturing and monitoring O2 sensor voltages in real time. If it has this ability, is is exactly the menu you need to use. First, insert the key into the ignition switch an turn it to detent just short of activating the starter; in this position, the entire car's FI system is energized and ready to fire. O2 sensors provide a straight base line voltage value at rest, meaning not actually reading 02 content. All primary and post car sensors should have the same baseline number on the scanner's screen, if I recall correctly. If a sensor is malfunctioning, it will not even likely provide the right baseline voltage and this is how you can tell if a O2 sensor is on its way out.

One step further, O2 sensors provide a predictable oscillating voltage signal in the form of a sine wave. If your scan tool can read real time O2 signal voltages, this is what you want to see for each primary O2 sensor. If you see an erratic wave on the scope function of your scan tool, that is a sure give away the O2 sensor is beyond its useful life, and replacement is warranted.

As for your VANOS problems, call Dr VANOS, this is the real vendors name, not some attempt at humor here, and ask him specifically what test you should perform to determine if the VANOS module on your sled is indeed experiencing intermittent failure, leading to your current predicament. There are more sophisticated scan tools that I believe can make the module activate a specific solenoid in the module; a year or so ago, I remember playing around with my buddy's expensive scan tool and manually activating a solenoid (when the car was at rest of course), and it made a faint "click" so this is a sure indicator the that the individual solenoid is working. That Scan tool was a $3,000 piece of equipment btw. Good luck fellah.
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Old 11-16-2012, 03:09 PM   #4
Big john (972)
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The thing is when I use my scanner to clear the service engine light. The car runs good for about a week, then the service engine come back. Been doing this for almost two months now.
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Old 11-17-2012, 02:27 PM   #5
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I think Slyde hit the nail on the head. Same symptoms I was having. Vanos solenoid fixed it. Not cheap to say the least. Good luck.
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Old 11-18-2012, 11:48 PM   #6
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Originally Posted by Prdquik View Post
I think Slyde hit the nail on the head. Same symptoms I was having. Vanos solenoid fixed it. Not cheap to say the least. Good luck.

You can get one rebuilt for 150 bucks plus core.
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