[Diy_efi] Air fuel meters

[James Seabolt]

I know this group is concerned with fuel injection but this has something 
to do with air fuel meters.

On my carburated Yugo, I've got the air fuel meter connected to a one wire 
Bosch O2 sensor.
I installed a Garrett T25 from a Saab 9000 and recycled the downpipe so the 
sensor is directly after the turbo. It's a "new" sensor. Meaning when I put 
the engine together I installed a new sensor.

Originally it seemed to work. But now when I start the car, the meter shows 
one light bar on the lean side (which I know is normal) and as the engine 
warms up the number of lights gradually increases. After several minutes up 
all light bars on the meter are lit up.

If I check the fuel mixture using the Gunson's Colortune device, it shows a 
nice blue flame. Then if I look at my meter, it's showing it's pegged out 
toward lean. The engine is not smoking so I know the fuel mixture is correct.

During the tuning process, I had some problems with the carburator flooding 
out because I couldn't get the fuel pressure correct. I'm wondering if 
during the process the O2 sensor got screwed up and it shorted out. Maybe 
it's coated with carbon or when gasoline hit it, fried the sensor.

I would think if this happened the sensor wouldn't be creating a voltage 
but as of right now it's acting like it's making .9 volts.

I ran an air/ fuel meter on a Fiat Spider with dual Weber IDFs. This 
particular meter I built from plans from this group. It was actually quite 
accurate. I used it to set the idle mixture and under acceleration, the 
meter would goto rich and under decel, it would go lean.

So I suspected it may just be I was using this meter on a single carbed 
engine and was giving me the weird readings.

Check out some of my projects:

http://users.chartertn.net/jseabolt/


James Seabolt
Tennessee, United States
Homepage --->>> http://users.chartertn.net/jseabolt/

2003 Subaru Baja
1980 FIAT 2000 "turbo" Spider
1968 Ford Fairlane 500 (Not a Ford Galaxie!!)
1987 Yugo GV 1500cc also turbocharged









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