Re: [Peugeot-L] Re: 505 Turbo AFM checks

On 12/13/05, august <august.macbeth@gmail.com> wrote:

> i take it logarithmic means its not linear (obviously), but it will > fluctuate during the complete sweep of the flap.

Well, no. Here's a graph of the the natural log of x (y = log(x)).

<http://www.themathpage.com/aPreCalc/Pre_IMG/log-e.png>

The resistance should increase somewhat like that. I would expect that the resistance should not decrease between two points (where point one is less open than point two), unless the AFM is dirty or otherwise worn out.

I also suspect that the Jetronic/Motronic ECU won't respond fast enough to the blips, will average out the readings, or otherwise compensates for the scattered resistance readings.

Also, worth keeping in mind, the quality of your multimeter will be important too. Most digital ones average things pretty slowly, resulting in some wacky readings if you're trying to check something that changes quickly (like an oxygen sensor).

--
alex


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