I have been having lots of trouble getting my 86 635 to pass smog ( way too rich ).99,000 miles
I am probably going to test the cat next by using a vacuum test to see if it's clogged.
In the meantime I tried this:
Using a DMM I measured the output of the AFM at the output arm at idle (about 1000 RPM) Yes I know it's high
Car warmed up, new O2 sensor hooked up, AFM screw turned out 4 1/2 turns.
Tried to move teeth on AFM, tightening by 1 tooth did make voltage go down about .03 volts.
Decent idle was at about 1.09 volts
Anybody else ever try this, is this a waste of time?
Sorry about coyote pic, couldn't get rid of it!
Thanks,
Jim
Is this a way of tuning AFM
Moderators: GRNSHRK, ron, bfons
Is this a way of tuning AFM
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Re: Is this a way of tuning AFM
Jim, got this shot probably from our board, and guessing that it's the same for all AFM's
BTW, nice coyote shot
BTW, nice coyote shot
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Bobbo
1980 633 CSi Cypress Green/Pearl Beige
2017 X5 M Sport Xdrive 35i Carbon Black/Ivory White
2005 330 Ci ZHP Cabrio Imola Red/Bone/Black
Re: Is this a way of tuning AFM
Yes , I've seen this great article.
Just wondering if anyone had done this before and approximately what voltage they were seeing at idle on a clean running 635.
This wiil give me an idea of where my "base" point should be.
Just wondering if anyone had done this before and approximately what voltage they were seeing at idle on a clean running 635.
This wiil give me an idea of where my "base" point should be.
Re: Is this a way of tuning AFM
Another article:
http://www.mye28.com/tech/rods_pages/si ... r_wilk.pdf
Unfortunately I don't have voltages for you. However, the O2 and computer should be able to compensate for any differences in AFM besides at idle...
Here was one, but it may be from 528e:
http://www.mye28.com/viewtopic.php?f=3&t=151407
http://www.mye28.com/tech/rods_pages/si ... r_wilk.pdf
Unfortunately I don't have voltages for you. However, the O2 and computer should be able to compensate for any differences in AFM besides at idle...
Here was one, but it may be from 528e:
http://www.mye28.com/viewtopic.php?f=3&t=151407
http://www.Drive4Corners.com
'79 635CSi Revival
'80 635CSi
'83 633CSi Callaway Turbo continued as 1988 535is Turbo
SOLD: '81 635CSi/A
'79 635CSi Revival
'80 635CSi
'83 633CSi Callaway Turbo continued as 1988 535is Turbo
SOLD: '81 635CSi/A
Re: Is this a way of tuning AFM
Thanks Tim,
I hadn't seen the 2nd reference where he wrote down the wrote down the segment volt outputs and started at a minimum of .14.
This may be a good starting point.
I hadn't seen the 2nd reference where he wrote down the wrote down the segment volt outputs and started at a minimum of .14.
This may be a good starting point.
- Ralph in Socal
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Re: Is this a way of tuning AFM
Different AFMs have different outputs. Make sure you use the correct information.
Ralph
Ralph
There is a very fine line between "Hobby" and Mental Illness.
85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)
85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)
Re: Is this a way of tuning AFM
I had done the 9v battery test on my friend's great running identical car, his voltage started at .4 at idle and 7.04 volts at full open so I guess there is a substantial difference between years.