Your best bet it to install an oxygen sensor. The unheated turbo sensors are less than twenty bucks. Are you sure it's not still there? On the Kjet turbos the sensor is on the exaust manifold in front of the turbo charger. Its hard to see if you don't know where to look for it. Otherwise it would not cost that much to have a bung welded onto the downpipe for a sensor.
Without an O2 sensor the lamda sond unit will defalt to a preset mixture that errs on the rich side, and you will get poor fuel economy.
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