On Wed, 3 Dec 1997, Bruce Cannon wrote:

> For example:
> A PIC hides back in the trunk under the mat and is powered by the fuel
> gauge sending unit wiring.  This PIC when enabled (keychain RF) will hold a
> solenoid valve (under car in front of tank, painted black and rubbed with
> grease etc.) open, allowing gas to flow to from through the fuel line.  So
> even if a thief used the stun-gun technique and fried the PIC, the car
> couldn't get more than a block.  Although why would they, since there
> doesn't appear to be any alarm at all?
>
> Questions:
> 1. Is the solenoid-valve in the fuel line idea really a girlfriend
> murdering device waiting to happen?
> 2. Why would the much-discussed stun-gun attack not fry all the OTHER
> micros in a modern car too, making it impossible to steal?
> 3. have I overlooked something?

You didn't mention the year, but if your car has a feedback carburator
 system, it may already have a fuel cut solenoid installed in the carb.  My
 car has 2 of them for emissions control during decel, and to stop the
 engine from running on after its keyed off.

These typically operate on 12v+ on/off.  Just install a relay or transistor
 in its path, controlled by the pic or switch or whatever.  If the primary
 fuel supply is choked off, the car will be undrivable, expecially if its
 an automatic.

A fuel injection system would be just as easy to disable with the appropriate
 ecm pinouts.

Steve

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