Gregs///M
06-21-2012, 01:21 PM
Up for sale is a electrically refurbished AFM from a 325I. This AFM will work with any 325I M20 including E28 and E34. Its got some cosmoline on it still and is in great shape mechanically and electrically.
I have refurbished this unit myself. The internal wiper arm has been disassembled and all contacts cleaned. The wiper arm now touches fresh resistor track material. The air inlet temperature sensor has also been tested throughout its range and it is within BMW and Bosch specifications.
As noted in the pictures, the Idle Adjustment Screw has never been tampered with. It looks like many have tried to remove the blue plug but no one was successful.
Here are some pics of the AFM and my testing process...
https://lh6.googleusercontent.com/-rlFDTJXacCk/T-NSpFWqxkI/AAAAAAAAFag/oKJmpjOc9F0/s720/DSC_1500.JPG
Close-up of the internal circuitry. Noticed the wiper arm contacts are centered over fresh material, not the worn tracts. Notice the primary contacts coming out of the black connector are shaped to touch fresh material too.
https://lh4.googleusercontent.com/-rG7r-6cBSQY/T-NUfhvCkFI/AAAAAAAAFbI/_sS-d79CwCE/s640/DSC_1500.JPG
Attempts to open idle screw. AFM's with non tampered idle screws are best to retain BOSCH original specifications.
https://lh5.googleusercontent.com/-7CgDJoCSsd4/T-NSo1lu1rI/AAAAAAAAFaU/Kk5VFK9n09I/s720/DSC_1503.JPG
https://lh5.googleusercontent.com/-2AkvzSZy-SQ/T-NSpdeQBWI/AAAAAAAAFao/cWO4SPqCUgI/s720/DSC_1504.JPG
Here is an oscilloscope capture of the internal flap being opened from 0% to 100% back to 0%. Notice no drops to zero and a smooth curve.
https://lh6.googleusercontent.com/-7whs1VqXbA8/T-NSo_1_v2I/AAAAAAAAFaQ/Q1i5_Cz5SFw/s640/1%2520cycle.jpg
This test simulates 7 full open cycles to show repeatability that the AFM gives true feedback with no signs of "drop out" or drops to zero.
https://lh3.googleusercontent.com/-7BXwxTIHGIU/T-NSqBdf-BI/AAAAAAAAFa0/p6ky_My9Ff4/s640/cycles.jpg
Last test is to take an "up close" look at the flap being opened from 0% to 10% very quickly. Also considered a repeatability test, nice clean signal over and over to show this AFM is truly giving out feedback like it was new.
https://lh6.googleusercontent.com/-aI_i5f-xPqQ/T-NSqO5GLyI/AAAAAAAAFaw/A0PcZfmoBFY/s640/repeatability.jpg
This AFM is setup and ready to install into your car. This AFM should last another 10+ years. Many driveability problems can be attributed to a bad AFM. Consider most AFM's these days are at least 20 years old. Almost every AFM i've ever opened has looked bad until refurbishment. In my professional opinion, if your AFM has never been refurbished by me or another electrical refurbishment company, then it is bad.
Please see my thread on AFM restoration for more info...
http://www.r3vlimited.com/board/showthread.php?p=3152483#post3152483
Asking $140 shipped.
I have refurbished this unit myself. The internal wiper arm has been disassembled and all contacts cleaned. The wiper arm now touches fresh resistor track material. The air inlet temperature sensor has also been tested throughout its range and it is within BMW and Bosch specifications.
As noted in the pictures, the Idle Adjustment Screw has never been tampered with. It looks like many have tried to remove the blue plug but no one was successful.
Here are some pics of the AFM and my testing process...
https://lh6.googleusercontent.com/-rlFDTJXacCk/T-NSpFWqxkI/AAAAAAAAFag/oKJmpjOc9F0/s720/DSC_1500.JPG
Close-up of the internal circuitry. Noticed the wiper arm contacts are centered over fresh material, not the worn tracts. Notice the primary contacts coming out of the black connector are shaped to touch fresh material too.
https://lh4.googleusercontent.com/-rG7r-6cBSQY/T-NUfhvCkFI/AAAAAAAAFbI/_sS-d79CwCE/s640/DSC_1500.JPG
Attempts to open idle screw. AFM's with non tampered idle screws are best to retain BOSCH original specifications.
https://lh5.googleusercontent.com/-7CgDJoCSsd4/T-NSo1lu1rI/AAAAAAAAFaU/Kk5VFK9n09I/s720/DSC_1503.JPG
https://lh5.googleusercontent.com/-2AkvzSZy-SQ/T-NSpdeQBWI/AAAAAAAAFao/cWO4SPqCUgI/s720/DSC_1504.JPG
Here is an oscilloscope capture of the internal flap being opened from 0% to 100% back to 0%. Notice no drops to zero and a smooth curve.
https://lh6.googleusercontent.com/-7whs1VqXbA8/T-NSo_1_v2I/AAAAAAAAFaQ/Q1i5_Cz5SFw/s640/1%2520cycle.jpg
This test simulates 7 full open cycles to show repeatability that the AFM gives true feedback with no signs of "drop out" or drops to zero.
https://lh3.googleusercontent.com/-7BXwxTIHGIU/T-NSqBdf-BI/AAAAAAAAFa0/p6ky_My9Ff4/s640/cycles.jpg
Last test is to take an "up close" look at the flap being opened from 0% to 10% very quickly. Also considered a repeatability test, nice clean signal over and over to show this AFM is truly giving out feedback like it was new.
https://lh6.googleusercontent.com/-aI_i5f-xPqQ/T-NSqO5GLyI/AAAAAAAAFaw/A0PcZfmoBFY/s640/repeatability.jpg
This AFM is setup and ready to install into your car. This AFM should last another 10+ years. Many driveability problems can be attributed to a bad AFM. Consider most AFM's these days are at least 20 years old. Almost every AFM i've ever opened has looked bad until refurbishment. In my professional opinion, if your AFM has never been refurbished by me or another electrical refurbishment company, then it is bad.
Please see my thread on AFM restoration for more info...
http://www.r3vlimited.com/board/showthread.php?p=3152483#post3152483
Asking $140 shipped.