1995 BMW stalls

Tiny
DYNASTYKNS
  • MEMBER
  • 1995 BMW 525I
  • 6 CYL
  • 2WD
  • AUTOMATIC
Stomp test is giving me 1221 code an 02 sensor code, changed it today and it ran great for bout 10 backfired and continued on to run good for bout another 30 minutes and the same problem again. What could this be?Really the old 02 sensor looked as if it had been changed before I purchased the car, well it had the Bosch one on it which I assumed was the after market one even had the maf sensor tested and cleaned, got new catalyc converters also still wants to stall. Ok after all of this we've replaced cam sensor and mass air flow sensor also, but once this car warms up once you attempt to drive it will stall(falls back down to idle) at.5miles every time, you can turn car off and restart it and its fine for another.5 miles, does seem to have a strong fuel odor at stall point. As long as the car is cool it runs fine problems begins once its warmed up
Saturday, November 13th, 2010 AT 1:09 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,575 POSTS
Has the fuel pressure been checked? Have you checked for leaks? Also, keep in mind, a bad O2 sensor can cause a rich fuel mixture. If you replace it, double check the wiring to it. I have seen many that have had melted or damaged wiring to the sensor.

Check that and let me know what you find.

Joe
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Sunday, November 14th, 2010 AT 6:26 AM
Tiny
DYNASTYKNS
  • MEMBER
  • 5 POSTS
Yes we've double checked o2 sensor and even replaced it twice, we're checking the fuel pressures now. Would that cause it to just stall in full driving mode?Once you restart the car it drives fine for half a mile and stalls again, it always restart and it never cuts off just falls back to idle n won't take any gas
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Monday, November 15th, 2010 AT 4:51 AM
Tiny
DYNASTYKNS
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  • 5 POSTS
Also light doesn't come on til the car but as long as the car is cool or just restarted it'll run fine
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Monday, November 15th, 2010 AT 5:26 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Is there any help I can offer here? The launch of the new site has put me WAY behind and I apologize.
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Saturday, November 20th, 2010 AT 11:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,575 POSTS
Hay:
Dr. Hagerty, your help is always welcome.

Joe
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Sunday, November 21st, 2010 AT 3:16 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Well, the first thing to do is to scan the car with the proprietary BMW software to retrieve the fault codes, and then come back and report them to us.
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Sunday, November 21st, 2010 AT 7:48 AM

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