Re: GTV-6/Milano Euro-Downpipes

["Rich Wagner" <drsavage@domain.elided>]

Michael, in response to Phil's question about the use of the O2 sensor on
his Milano, wrote:

>Definitely your Alfa engine management computer needs an O2 sensor to run
>correctly. Without one, the unit will think the O2 sensor  has failed and
>use the "limp home" circuit. Expect less power and higher fuel consumption
>as the injection computer has to enrich the mixture to be on the safe side
>until the O2 sensor is repaired (which it never will be if you leave it
>off). Winter running may be especially rough and costly in fuel.

This is only partly correct.  The L-Jetronic system on Phil's Milano will
detect the floating voltage on the O2 sensor line and decide that it is
inoperative.  However, it will <not> go into any sort of "limp home" mode. 
The system will simply go into open-loop mode, basing all of its fuel
delivery calculations on the measurements of the AFM alone.  The mixture
will likely go slightly rich, reducing power slightly, decreasing Phil's
fuel mileage slightly (both of these effects are probably so small as to go
unnoticed), and increasing his emissions.


Rich Wagner
Montrose, CO
'82 GTV6 Balocco

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