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Misfire codes

Tiny
GMCREYNOLDS
  • MEMBER
  • 1996 BMW Z3
  • 4 CYL
  • 2WD
  • MANUAL
  • 106,000 MILES
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
Friday, December 17th, 2010 AT 2:46 PM

9 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
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.
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Friday, December 17th, 2010 AT 5:10 PM
Tiny
GMCREYNOLDS
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  • 9 POSTS
Thanks Doc. I will take a look at the valve and hoses and let you know. I appreciate the guidance. Greg
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Friday, December 17th, 2010 AT 7:31 PM
Tiny
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Cheers mate.
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Saturday, December 18th, 2010 AT 5:00 PM
Tiny
GMCREYNOLDS
  • MEMBER
  • 9 POSTS
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
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Monday, January 10th, 2011 AT 3:31 PM
Tiny
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  • MECHANIC
  • 9,601 POSTS
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.
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Monday, January 10th, 2011 AT 3:37 PM
Tiny
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You know it. Already shared the site with a few friends and singing ya'lls praises! Thanks
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Monday, January 10th, 2011 AT 3:43 PM
Tiny
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Isn't plural of y'all, all y'all? Lol
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Monday, January 10th, 2011 AT 3:53 PM
Tiny
GMCREYNOLDS
  • MEMBER
  • 9 POSTS
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. :)
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Monday, January 10th, 2011 AT 4:12 PM
Tiny
DOCHAGERTY
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Good to know!
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Monday, January 10th, 2011 AT 4:42 PM

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