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Secondary Air Pump system will not complete drive cycle Secondary Air Pump system will not complete drive cycle
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  #21  
Old 11-22-2021, 03:29 PM
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I am getting some Lambda errors in the enhanced diagnostics. Some of them reporting unburnt fuel (i had a misfire issue a while back) and some talking about Trim in banks 1 and 2.

This is starting to look like maybe 02 sensors as someone said earlier in this thread. Gonna look today.
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  #22  
Old 11-22-2021, 04:36 PM
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If they are old enough I would replace them. OEM only (don't make the mistake many of us have of "renting" some crappy O₂ sensors).


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  #23  
Old 11-22-2021, 05:57 PM
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Originally Posted by andrewwynn View Post
If they are old enough I would replace them. OEM only (don't make the mistake many of us have of "renting" some crappy O₂ sensors).


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Not sure their age. That’s why I’m leaning (har har) towards just doing them.

Is Bosch OEM? The bmw dealer has to order them and I’m on a time crunch to get it smogged.

Will they work long enough to ready up and pass then I can swap when the good ones come in?


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  #24  
Old 11-22-2021, 05:58 PM
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Also, upstream, downstream, or both?
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Old 11-22-2021, 06:02 PM
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Secondary Air Pump system will not complete drive cycle
Bosch OEM. Upstream. I used a pair of knock off for $40 ish Amazon would get you though a smog
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  #26  
Old 12-07-2021, 12:25 PM
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OK, I have updates. I have replaced the O2 sensors with Bosch O2 sensors and that has not solve the problem. it still will not complete the drive cycle. Does anybody have any other suggestions?

Anything electrical?
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  #27  
Old 12-07-2021, 04:57 PM
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Timing and fuel injectors would be my next check. Do you have a power probe to check injector pulse?
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Old 12-07-2021, 05:21 PM
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Originally Posted by Agent 14 View Post
Oh my mistake. Yes the pump runs and the check valve appears to be working. There are ZERO codes.

Is there a smoke test I can do to check for vac leaks? I did a crankcase smoke test and found the PCV failures, hence that was replaced.
There are several youTube videos that show how to makes a good inexpensive smoke tester out of a paint can. I made one and it works great. https://www.youtube.com/watch?v=Np_duzsaZxI
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Old 12-07-2021, 06:27 PM
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Oh man. That is brilliant.

I’m gonna do that first, because I still don’t trust the vac system in the rear of the engine.

Thanks!!!
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  #30  
Old 12-07-2021, 08:30 PM
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Oh man. That is brilliant.

I’m gonna do that first, because I still don’t trust the vac system in the rear of the engine.

Thanks!!!
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