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If you have no lambda then your WUR controls enrichment under throttle by vacuum. I've an '83 Euro 3.0 with a wideband AFR gauge in place of my clock.
I cruise at 14.5 to 14.7 ( I like it a little fat due to the Az heat)...however, under wot it drops down into the 11 range as it should.
Most older WURs need a rebuild and have been compensated for by simply fattening up the AFR...that works ok for cruising but it will simply lean out at wot or under aggressive driving.
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