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Car Forum / BMW Cars / October 2008multiple misfire
I have a po300 randon/multiple cylinder detected misfire, po303 mis fire cyl #3, po302 misfire cyl #2, po304 misfire cyl #4 that came up on my emission test. The fuel trim on bank one po170. what advice or possible fix can anyone give. >I have a po300 randon/multiple cylinder detected misfire, po303 mis >fire cyl #3, po302 misfire cyl #2, po304 misfire cyl #4 that came up >on my emission test. The fuel trim on bank one po170. what advice or >possible fix can anyone give. When did you last do a tuneup? What do the plugs look like? --scott  Signature"C'est un Nagra. C'est suisse, et tres, tres precis." > In article <7c4938a6-958b-4951-bc9d-a9d930a26...@p49g2000hsd.googlegroups.com>, > [quoted text clipped - 10 lines] > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." the plugs on the passenger side of the engine was very black with heavy soot. I changed them but I think more needs to be done. >> In article <7c4938a6-958b-4951-bc9d-a9d930a26...@p49g2000hsd.googlegroups= >.com>, [quoted text clipped - 12 lines] >the plugs on the passenger side of the engine was very black with >heavy soot. I changed them but I think more needs to be done. All of them? That's a sign that everything on that side is running too rich or is badly misfiring. Since it's an injected system, odds are better that you have an ignition issue or a valve issue than a mixture issue (mixture issues will tend to be common to all cylinders or specific to just one). Pull one of the plugs and crank with the plug out and see if you get a nice fat spark or a thin wavering one. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." >>> In article <7c4938a6-958b-4951-bc9d-a9d930a26...@p49g2000hsd.googlegroups= >>.com>, [quoted text clipped - 20 lines] >you get a nice fat spark or a thin wavering one. >--scott Multiple missfire is a good indication that the boot that goes between your coil pack and the sparkplug has gone bad. You have one for each sparkplug and they sell for about $11.00 each at vendors like BMP Design, about $16.00 each at BMW dealers in the USA. RJD |
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