Re: [alfa] L-Jetronic Idle Mixture

[Kevin Redden <kredden@xxxxxxxxx>]

Tom,

It just so happens I was reading info on this from a website I printed 
out for a plane trip this afternoon...

http://www.oldebottles.com/italiancarspage3.htm

Take a look at step 11.

kevin
86 Spider

Tom O'Neil wrote:


> Ciao a tutti,
>
> I have a 1984 L-Jetronic Spider. The car runs fine, but it has a rich 
> idle, judging from the smell and from the carbon soot on the floor of 
> my garage. What's driving me crazy is that the idle mixture adjustment 
> screw doesn't seem to do anything.
>
> As I don't have access to a gas analyzer, I'm using the oxygen sensor 
> voltage method of setting the idle mixture. At idle, and with the O2 
> sensor nice and hot, you disconnect the O2 sensor and check voltage 
> from the sensor to ground, using a high-impedance digital multimeter. 
> The correct idle mixture should show about 500 mV. (To be more 
> specific, you can check the high and low range of the sensor and then 
> set the idle mixture at the halfway point, which should be somewhere 
> in the neighborhood of 500 mV.)
>
> I can turn the mixture screw from "full in" to "full out" and the 
> voltage hardly budges from about 900 mV. I'm convinced that the O2 
> sensor is OK, because if I introduce some unmetered air into the 
> stream (e.g.: by cracking open a hose), the voltage drops quickly and 
> predictably. This led me to think that there might be an obstruction 
> in the airflow meter. I removed the AFM from the air box and was able 
> to pass a thin wire from one end of the idle air passage to the other, 
> so there's no obvious obstruction there.
>
> This is pretty straightforward stuff, and shouldn't be so freakin' 
> confusing. Can anybody tell me what I'm overlooking??
>
> Grazie mille.
>
> Tom O'Neil
> '84 Spider Veloce
>
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