Secondary Air System Carbon Build Up Removal Pictures - Page 20 - BMW M5 Forum and M6 Forums
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post #191 of 327 Old 2nd April 2013, 04:04 AM
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I dont know. When i did it I was sure it was going to work. I t just did not. There is no arcing from switching even. The contacts should stay mint.
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post #192 of 327 Old 2nd April 2013, 04:21 AM
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I will search how to monitor the fuel trim and test as you have suggested. I would like to get this figured out. My car has 142k on it so I would have thought that if the SAS was going to be blocked due to carbon build up it would have happened by now. Perhaps the problem is with some other component, maybe even the O2 sensor? Could a bad sensor alone throw the AA code?
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post #193 of 327 Old 2nd April 2013, 04:37 AM
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Any chance you've got the pots set lower than 0.45V? Because I figure that is what the DME is looking for - a steady lean signal from the two precat O2 sensors while SAP is running.
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post #194 of 327 Old 2nd April 2013, 04:49 AM
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I did spend a lot of time trying to tune them just right. They are finicky to tune in precisely, but we are talking +/- 0.05V and I would hope that is close enough. Sailor is talking about a lean condition after the simulator switches back to the straight O2 signal. I need to figure out how to read the fuel trims and compare with and without the sim as he suggested. It does not make intuitive sense that the sim would cause this drop, but I'm not a EE and he certainly seems to know his stuff on this topic.
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post #195 of 327 Old 2nd April 2013, 04:57 AM
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post #196 of 327 Old 2nd April 2013, 05:00 AM
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I just realized something the v drop is. 05 to make the trim go out 9%. Phone posting sucks
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post #197 of 327 Old 2nd April 2013, 05:35 AM
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Wow, just 0.05V to change trim by 9%? That's not much room for anything to be out. The long term trims are only changed by O2 data logged after the SAP is turned off, correct?
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post #198 of 327 Old 2nd April 2013, 02:40 PM
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Yes but the whole range is .2-.9 effectively but the sweat spot is more like .3 -.7. The .05 was calculated so don't read to much into that number, but it shows what a little resistance could do. Truly the only thing you can look at is fuel trim.
As far as codes .... you may get one or not depends where your fuel trim is. I got a code that is what alerted me but it took a few weeks. I thought it was one of the normal things like air leaks/fuel pressure. I could not find anything so returned the car to stock to start again and that is when I found it.
It may not happen to you just because one experiment goes bad does not mean the second will.
The problem is it is artificial the car thinks there is less air than there is so balances to the wrong number. Just a guess on my case I was probably running a 1.4 (10%) leaner mix so 16.1/1.
Fuel trims are easy to read PA software or some generic $100 scanners that also read codes.
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post #199 of 327 Old 2nd April 2013, 02:53 PM
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Thanks so much for all of the information Sailor. I will figure out how to read the trims and do the experiment that you have recommended. Just out of curiosity, did you use the same cheapie components for your sim circuit as in the 318 thread? Thanks again for your time...I really appreciate the input.
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post #200 of 327 Old 3rd April 2013, 01:01 AM
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