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E34 (1989 - 1995)

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  #1  
Old 11-28-2012, 01:41 PM
CG92 CG92 is offline
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Mein Auto: 1994 530i
Help with emissions!

my 1994 530 with an m60b30 has just failed emissions horribly

I recently purchased this car for a good deal and have been fixing it up here and there with my 95 540 parts car

Using a peake research code reader it was throwing four codes, lambda control 1, lambda control 2, O2 sensor 1, and O2 sensor 2

So far I have changed the spark plugs and coil boots, cleaned the ICV and MAF sensor, and have a ccv on its way in the mail and just bought a fuel filter which hasn't been put it in yet, and changed the crank sensor which is reading ohms in spec according to troubleshooting manual

at times it can idle a little rough specially when cold and when hammering on the gas at around 3500 to 4800 rpm it bucks and hesitates as if there were a misfire

I am new to owning a BMW so any help would be great, I thought about replacing o2 sensors but would like some advice before spending more money
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  #2  
Old 11-28-2012, 02:17 PM
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Monsignor Monsignor is offline
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just a question:

If your car tells you the O2 sensors are shot, then why would you even create a user name to post from before replacing those. The car just told you the answer. O2 sensors can and will end an emission test very abruptly.




EDIT:

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Last edited by Monsignor; 11-28-2012 at 02:19 PM.
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  #3  
Old 11-28-2012, 05:30 PM
snowsled7 snowsled7 is offline
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Quote:
Originally Posted by 95 E34 View Post
just a question:

If your car tells you the O2 sensors are shot, then why would you even create a user name to post from before replacing those. The car just told you the answer. O2 sensors can and will end an emission test very abruptly.
Seems pretty obvious to me
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  #4  
Old 11-28-2012, 05:39 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by 95 E34 View Post
just a question:

If your car tells you the O2 sensors are shot, then why would you even create a user name to post from before replacing those. The car just told you the answer. O2 sensors can and will end an emission test very abruptly.




EDIT:

welcome to the 'fest
Padre, what would happen if he pulled out the relay for his o2 sensors and deactivated them and deleted all error codes? Would the car somehow compensate in other ways such that he still passes emissions, but perhaps just does not run optimally (assuming other sensors are not shot)? How did non o2 sensor cars pass emissions ?
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  #5  
Old 11-29-2012, 09:03 AM
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Monsignor Monsignor is offline
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Quote:
Originally Posted by robertobaggio20 View Post
Padre, what would happen if he pulled out the relay for his o2 sensors and deactivated them and deleted all error codes? Would the car somehow compensate in other ways such that he still passes emissions, but perhaps just does not run optimally (assuming other sensors are not shot)? How did non o2 sensor cars pass emissions ?
none O2 sensor cars are historic and dont require emission.

He could just replace his O2 sensors as regualr maintenance of any car would dictate and continue from there. I think I scared him away anyway, so oh well.
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  #6  
Old 11-29-2012, 03:06 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by 95 E34 View Post
none O2 sensor cars are historic and dont require emission.

He could just replace his O2 sensors as regualr maintenance of any car would dictate and continue from there. I think I scared him away anyway, so oh well.
He richly deserved it.....
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