> -----Original Message-----
> From: M. Adam Davis [SMTP:adampic@UBASICS.COM]
> Sent: Friday, November 01, 2002 4:43 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: Getting signal safely from fuel injector
>
> IIRC, the fuel injector looks just like a solenoid to the car computer.
>  You should be able to see a nice, clean 12v pulse (with perhaps voltage
> spikes when tunred off) on the wire.
>
To ensure the injector closes as quickly as possible (and hence allow more
accurate metering) the voltage is allowed to rise considerably. which is why
the ignition coil interface is likely to be very suitable.  Certainly, it is
not a clean pulse, it can have considerable ringing.

Mike

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