RE: L-Jetronic ECU fragility? was V6 stalling - slightly off topic!

[webb.p@xxxxxxxxxxx]

The killer of ECU's is usually high flyback voltages from the injectors.   
Since the L-Jet uses a peek and hold (sequential) injection which is very 
robust on the low-z injectors, it's a low risk on the unit.  That, and as Brian 
pointed out, its analog.

Modern digital units use PWM type which creates high flyback voltage, hence the 
reason for the high-z (Bosch yellow) type injectors.  Any spike in the 
electrical system while running increases the usually flyback of about 120 
volts to over 500 volts in some cases, killing the ECU.

You guys should check out the diy-efi mailing list.   Lots a great information 
on EFI in general, with some Bosch specific info.  www.diy-efi.org.   Follow 
the links to subscribe.

-Peter
> > I was repeating Pat Braden's advice as outlined in his "Alfa Romeo 
> > Bible." If I could put my hands on my copy, I'd quote chapter and 
> > verse, but I don't know where I put it. Maybe some other digester can 
> > come to my aid here.
> 
> I'm with John on this one, the L-Jet is an analog computer, mostly
> resistors and simple, rugged components inside.  I think more modern
> systems with programmable CPU's inside them would be more susceptible to
> static charges and the like, but the L-Jet is pretty basic inside.
> 
> But then again, I'm the one who violated Ohms law, so what do I know?
> 
> bs
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