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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 12-02-2011, 05:54 PM
EddieAdams EddieAdams is offline
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Service engine light - P0300 codes

Gentlemen,

Nothing like starting off your weekend with a service engine light and a slew of codes.

I just got started on my daily 4 miles drive home from work when the light came on. Stopped at an auto parts store and they hooked up the OBD tool. Codes were:

P0300
P0306
P0307
P0308

He said these codes refer to ignition coils that could be causing misfire, but said it's unlikely so many coils could go bad all at once!! The car drives just fine.

Anyone had such codes all at once? What could it be?
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  #2  
Old 12-02-2011, 06:17 PM
HerbP HerbP is offline
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Here are the code description's! I seriously doubt that all of those cylinders would have misfires, unless it is fuel related. Possible problems could be bad fuel filter, or high pressure pump problems. You will need to get further diagnostics run.

Good Luck

P0300 75 Random/Multiple Cylinder Misfire Detected
P0301 50 Cylinder 1 Misfire Detected
P0301 63 Cylinder 1 Misfire Detected
P0302 51 Cylinder 2 Misfire Detected
P0302 64 Cylinder 2 Misfire Detected
P0303 52 Cylinder 3 Misfire Detected
P0303 65 Cylinder 3 Misfire Detected
P0304 53 Cylinder 4 Misfire Detected
P0304 66 Cylinder 4 Misfire Detected
P0305 54 Cylinder 5 Misfire Detected
P0305 67 Cylinder 5 Misfire Detected
P0306 55 Cylinder 6 Misfire Detected
P0306 68 Cylinder 6 Misfire Detected
P0307 56 Cylinder 7 Misfire Detected
P0307 69 Cylinder 7 Misfire Detected
P0308 57 Cylinder 8 Misfire Detected
P0308 70 Cylinder 8 Misfire Detected

Last edited by HerbP; 12-02-2011 at 07:16 PM.
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  #3  
Old 12-02-2011, 06:20 PM
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MakaveliFaison MakaveliFaison is online now
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Looks like feul was interrupted temporarily . If injectors don't shoot out enough gas for whatever reason it'll cause misfires.
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  #4  
Old 12-02-2011, 06:24 PM
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hd750Li hd750Li is offline
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Wow, these guys have better knowledge than BMW stealership.
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  #5  
Old 12-02-2011, 06:33 PM
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MakaveliFaison MakaveliFaison is online now
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I had this happen to me once after I did my valve cover gaskets. The fuel rail was loose on one side and later on while sitting in traffic I had a random crazy misfire on multiple cylinders but only on one side of the engine. So I looked over car later and secured the rail properly and never had problems again. Also my brother was replacing ignition coils every 3 months on his car for a while and it ended up being his injectors were pretty clogged. Got them cleaned and now he has no more problems.
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  #6  
Old 12-02-2011, 06:38 PM
EddieAdams EddieAdams is offline
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I don't think it's the coils either. Could it be some fluid leaking into the cylinders causing misfire? I know I have some oil leak and looking into replacing valve cover and timing gaskets. I also have a coolant leak, but don't know where from.
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  #7  
Old 12-02-2011, 06:42 PM
EddieAdams EddieAdams is offline
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ok... this is good info. Where's the fuel rail? and can I access if simply by lifting the hood?

Also, what's the more appropriate few injectors cleaner for my car? and where can I get it?

Your help is greatly appreciated.
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  #8  
Old 12-02-2011, 06:47 PM
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Rookie2008 Rookie2008 is offline
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You not lying! +1 on that note. MakaveliFaison is the truth. He just helped me with my codes.. Thanks again bro.
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Last edited by Rookie2008; 12-02-2011 at 06:59 PM.
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  #9  
Old 12-02-2011, 06:57 PM
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If you open the hood and take engine cover off the fuel rail is directly below the engine wire harness. The side of your engine that misfired is the driver side. But if I remember correctly the cap that you unscrew to clean fuel rail is on the passenger side right up front. I'd just take it somewhere and let them clean your injectors. I think you may want to get them done professionally.because that over the counter, put something in your tank stuff isn't going to help up front that much.
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  #10  
Old 12-02-2011, 07:25 PM
HerbP HerbP is offline
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A bottle of Techron every month will help keep the fuel system clean. It can be purchased anywhere that sells automotive supply's. A fuel injection cleaning would be a good preventive service. While doing this, they could measure your fuel pressure to see if there might be another problem. You should be able to get this done for around 200.00.

Fluids getting in from the valve cover gaskets is not possible. If you are losing coolant there are 3 places to look. 1st inspect your coolant bottle. Next check your overflow line that cross the top of the radiator. Last look at the front of the engine just above the center pulley. That would be the dreaded weep hole leak. Make sure to use BMW coolant. It should run around 18.00 a bottle.
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  #11  
Old 12-02-2011, 07:38 PM
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200 sounds kinda high for that service. Its only like 90 here
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  #12  
Old 12-02-2011, 07:39 PM
HerbP HerbP is offline
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That sounds like a deal!
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  #13  
Old 12-04-2011, 12:37 PM
EddieAdams EddieAdams is offline
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Quote:
Originally Posted by MakaveliFaison View Post
If you open the hood and take engine cover off the fuel rail is directly below the engine wire harness. The side of your engine that misfired is the driver side. But if I remember correctly the cap that you unscrew to clean fuel rail is on the passenger side right up front. I'd just take it somewhere and let them clean your injectors. I think you may want to get them done professionally.because that over the counter, put something in your tank stuff isn't going to help up front that much.
I've attached three pictures of the engine. Could you point out:

1. The fuel rail line
2. The cap I need to unscrew to clean the fuel injectors

I have no idea where they are!

Thanks
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  #14  
Old 12-04-2011, 06:00 PM
HerbP HerbP is offline
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The fuel rail lines are under the black plastic on each side side of the engine. I do not think that you will have the personal equipment to perform the flush.
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  #15  
Old 12-04-2011, 06:19 PM
EddieAdams EddieAdams is offline
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I wan't planning on doing the flush. Just wanted to check and see if the fuel rails are secure in place. Off to the mechanic tomorrow...
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  #16  
Old 03-25-2013, 09:11 AM
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paulmurphyhomes paulmurphyhomes is offline
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Well, I have been spoiled with 88,000+ miles of worry free driving. Occasionally I had a blip in the tach for the last 6 months or so. Then this weekend the coolant low warning came on. I topped off the tank and then I got a CEL and very rough idle. What is the "dreaded weep hole leak?" I'm not driving that car today and will need to look. How does this affect the idle?

Thanks.
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