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AFM testing aftermath (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by Artem Grigortyev on January 10, 2001 at 10:27:14:

Thanks to everybody for your suggestions for my question (AFM testing SOS!!!!!). That day I actually managed to get home with a shaken baby syndrome and sounding like a local shooting range. What I discovered is that my transfer pump wasn't working (donít ask me how much time I spent fishing it out from the fuel tank when it broke off). Now it runs better though still lacks some power. I'm not sure that it wasn't the fact that I disconnected the battery, which reset the computer.

The question is, why would faulty transfer pump affect me on low rpms (felt like riding a horse when it is trotting) but as soon as I would get past 3000 rpms it would level out?

As to my AFM I still look suspicious at it. I took it apart and figured that the only way to test it is to feed 5 volts into it and then read the output. Resistance check will not help you because it got bunch of parallel resistors connected to the main track, which gives you the jumpy reading as the arm moves along the track. Does anybody know how the computer interprets the signal from the AFM sensor?

Thanks for your input.

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