misfire codes

1996 BMW Z3
106,000 MILES • 4 CYL • 2WD • MANUAL
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GMCREYNOLDS
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1996 BMW Z3 with 106,000 running rough and getting these codes:
P0420
P0301
P0300

anybody know the meaning of these codes and if they are the source of my problems? Thanks, Greg
Dec 17, 2010 at 2:46 PM
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DOCHAGERTY
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There is a small valve that has a high failure rate on that engine. There is a great exploded view of it at Realoem.com 11157501567 Go to the site and put in this part number and you can see for yourself. The vent hose might need replacement as well, be prepared. Two 5mm Allen screws can be accessed from under the manifold, off it comes.
Dec 17, 2010 at 5:10 PM
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GMCREYNOLDS
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Thanks Doc. I will take a look at the valve and hoses and let you know. I appreciate the guidance. Greg
Dec 17, 2010 at 7:31 PM
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DOCHAGERTY
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Cheers mate.
Dec 18, 2010 at 5:00 PM
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GMCREYNOLDS
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Hey Doc. I ordered the vent valve, put it on and changed the hose as well. Easy fix. The other one was shot with a melted bottom seal and a cracked/broken check valve. I "hard reset" the check engine light and ran it to let the engine reset it self. I could feel more power immediately and did not seem to be missing. Will monitor the gas mileage (as it had decreased about 3 mpg) and wait to see if get the check engine light again. The valve was definately faulty and needed to be replaced. Thanks for the heads up and quick fix. Greg
Jan 10, 2011 at 3:31 PM
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DOCHAGERTY
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Glad we got right to it mate. You can count on all of us at 2CarPros to be here when you need help with your car questions.
Jan 10, 2011 at 3:37 PM
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GMCREYNOLDS
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you know it...already shared the site with a few friends and singing ya'lls praises! Thanks
Jan 10, 2011 at 3:43 PM
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DOCHAGERTY
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Isn't plural of y'all, all y'all? lol
Jan 10, 2011 at 3:53 PM
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GMCREYNOLDS
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Depends on what part of Tennessee, USA ya'll are from! At lease I didn't say "youin's"...we speak old English in these hills but kinda make it up as we go. :)
Jan 10, 2011 at 4:12 PM
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DOCHAGERTY
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Good to know!
Jan 10, 2011 at 4:42 PM