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Old 10-12-2012, 03:25 PM   #1
PhilGul
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Join Date: Oct 2012
Location: San Diego
Posts: 2
My Ride: 2005 E46 M3 SMG
Error code and engine issues

Hey guys, I need some of you help/advice.
I have a 2005 e46 M3 SMG with about 131k miles. Recently, I had the service engine light come on and off.

Here's the back story:
I was driving around and shifted from 3rd to 4th and my RPM/s dropped under the 1.5k mark. (I just wasn't paying attention.) Usually, this isn't a problem, I'd just shift back down and get higher RPM's and continue on my way. However, the other day, that did not happen. I came to a stop and it started idling around the 500 mark. Service engine light came on. I started driving again, and it felt like the car wasn't getting enough gas/oxygen and no power was coming from the engine. It felt like I was driving a beaten down civic. About a quarter mile down I stopped again, and the problem went away, and the light switched off. This happened about 3 days ago. In the last 3 days, I've been driving her around and every once in a while when the RPM's get too high or too low, the same problem will come up. Check engine light, reduced power, etc. And, then goes away.
Also, when the light is on, and I'm driving, my RPM's read that they are low, but if I use the pedal, I can hear it getting louder.
I filled up my car with gas, thinking poor fuel quality might be the problem, and the car improved, but not completely.
It still feels slugish.

I went to pepboys and the told me that I had only one error code: P0305 Cylinder 5 Misfire Detected.

Side note, please do not criticize/flame me, but I am 18. I can only do so much mechanical stuff on a car. And, since I am 18 with an M3, I obviously abuse/neglect her. Lol.

I have researched that this could either be caused by old spark plugs, or old coils. But, that may not by the only problem. Any additional help would be appreciated.

Thank you! Thanks for your time too guys.
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Old 10-12-2012, 03:34 PM   #2
jgold47
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Join Date: Sep 2010
Location: Imported from Detroit
Posts: 1,261
My Ride: 2004 X5 3.0
you can test the coil theory by switching the coil from #5 with a different cylinder and see if it misfires on that cyl. New sparkplugs never hurt, do you have any idea how many miles are on yours? Also, have you changed your O2 sensors ever? If the car thinks its running rich, it may dial back the A/F which may account for the sluggishness. You may also want to invest in a BMW scanner, or a INPA/DIS setup, which should let you read shadow codes, or codes that are stored, but have not occured enough times to light the CEL. I am going to bet you have shadow codes for something else which may be a clue. Lastly, have you changed your vanos seals? (Does an s54 have the same vanos??)
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Old 10-12-2012, 03:40 PM   #3
PhilGul
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Join Date: Oct 2012
Location: San Diego
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My Ride: 2005 E46 M3 SMG
I plan on switching the coils today. I had to wait until today because I had too many classes at UCSD.
I believe my spark plugs have never been replaced. Parents purchased the car with 35k miles in '07 for my brother; he never worked on it. I later 'inherited' it from him at 95k miles.
02 sensors have also never been changed, as far as I'm aware.
I shall look into getting ahold of BMW scanner or a INPA/DIS setup, and let you know more as soon as I find out more.
Vanos seals have also not been changed.

Yes, I know, I severely neglect her...

Last edited by PhilGul; 10-12-2012 at 03:40 PM.
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Old 10-12-2012, 10:53 PM   #4
jgold47
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Quote:
Originally Posted by PhilGul View Post
I plan on switching the coils today. I had to wait until today because I had too many classes at UCSD.
I believe my spark plugs have never been replaced. Parents purchased the car with 35k miles in '07 for my brother; he never worked on it. I later 'inherited' it from him at 95k miles.
02 sensors have also never been changed, as far as I'm aware.
I shall look into getting ahold of BMW scanner or a INPA/DIS setup, and let you know more as soon as I find out more.
Vanos seals have also not been changed.

Yes, I know, I severely neglect her...
No your just normal. Start with the tune up.
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Old 10-12-2012, 11:24 PM   #5
choxor
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My Ride: JDM
These cars require specific maintenance at certain intervals. Start with that. If you can't afford it sell it.
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