Re: Peugeot 206 Engine HFX (and fix) - A common fault highlighted Archived Message
Posted by Shaun Dale on January 10, 2008, 1:44 pm, in reply to "Re: Peugeot 206 Engine HFX (and fix) - A common fault highlighted"
Hi Nigel, I would think that the back emf would reduce, The Q value (Quality, I think)of a coil with shorted turns drops dramatically, you would see less "ringing" and a much reduced overshoot (i.e the back emf). The forward current however would go through the roof, instead of ramping up exponentially as normal, starting off level and getting steeper, it would shoot straight up to whatever the driver device could manage. I think this is what blows the ECU up. Unfortunately my 'scope only has an LPT port on it so the only way I could post waveforms is to find an old printer and then scan them in . I would not have got waveforms off the bad injector anyway because the ECU was spotting the fault and shutting down the injector drive. If you have an injector tester (lucky sod) buy an LCR meter, a cheap one was £25 a midrange one about a £100. Test a few good ones to establish a baseline and then test every one you put on the machine (how long's it gonna take, 30 seconds each max). Shaun
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