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E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 12-30-2016, 11:19 AM
Bavarian6Läufer Bavarian6Läufer is offline
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Location: San Diego, CA.
 
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Mein Auto: 645ci
Random/Multiple Cylinder Misfire Detected

2005 645Ci

Check Engine light is on with a iDrive notification for increased emissions.

Used a Bosch OBDO reader and the code that popped was P0300 - Random/Multiple Cylinder Misfire Detected.

Confirmed Fixes that show up for that code are:
- Replaced Crankcase Pressure Regulating Valve (Likely fix)
- Replaced Evaporative Emissions (EVAP) Canister Vent Solenoid/Valve (Possible fix)

I have already replaced the Crankcase Pressure Regulating Valve which made the light go away for about 2 weeks then magically it reappeared. so I am going to replace the Evaporative Emission Canister Vent Solenoid/Valve and see if that helps.

the only problem I face with this task at the moment is not knowing where it is exactly. I have looked up the part online and different images show up so I'm not sure which one to look for or where its located.

if someone walk me through it or provide a image pointing out the location that would be great.

also if anyone has ever dealt with this issue and know for sure what it could or could not be your experience is welcomed!
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  #2  
Old 12-30-2016, 06:30 PM
HerbP HerbP is online now
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Mein Auto: 2005 645Ci & 2007 750Li
Random misfires on our engines are usually from a weak battery, below 12 volts. I would suggest that you measure your battery voltage under the hood at the jump terminal. Turn your lights on, with the engine off & measure the voltage. If it is below 12 volts, try charging the battery to see if the code will go away. Increased emission warnings can be cause by the CCV valve, the purge valve, & a loose gas cap. There are 2 CCV valves, one on each valve cover. Try charging the battery after measuring the voltage, to see if the engine runs any better.
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Old 12-30-2016, 08:09 PM
Bavarian6Läufer Bavarian6Läufer is offline
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Mein Auto: 645ci
I tested the voltage and it was around 12.20 with just the key turned. With the car on it was around 14.40ish. also the battery is less than 8 months old. Not sure if that bit of information is relevant but who knows.
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Old 12-30-2016, 08:52 PM
HerbP HerbP is online now
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Did you change both CCV valves?
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  #5  
Old 12-30-2016, 08:59 PM
HerbP HerbP is online now
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Canister Vent valve. It might cause the emission warning, but not misfires.

http://bmwfans.info/parts-catalog/E6...breather_valve
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  #6  
Old 12-30-2016, 09:11 PM
Bavarian6Läufer Bavarian6Läufer is offline
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Mein Auto: 645ci
I haven't changed those, only both crankcase ventilation valves. Are my voltage readings normal?
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  #7  
Old 01-12-2017, 06:45 PM
mgfranz mgfranz is offline
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And change your plugs...
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  #8  
Old 01-15-2017, 09:01 AM
FredoinSF FredoinSF is offline
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About voltage, 12.2 with engine off is not optimum. Should be 12.6 with engine off on a new battery. If there is warranty I would have it checked. 14.4 while running is fine.


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Old 01-17-2017, 07:20 AM
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Mulchman Mulchman is offline
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Mein Auto: '07 650i
+1 Battery, plugs and Vacuum. CCV(s) and vac lines. On the later E63 (06 or 07+) only 1 CCV on valve cover.
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Last edited by Mulchman; 01-17-2017 at 07:23 AM.
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2005, 645ci, crankcase, emission, evap, misfire, multiple, p0300, random


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