A short across the sensor would give maximum lean correction.
In a modern car if one pulls the sensor connector the controller instantly substitutes a mapped value. As you saw those old controllers believe anything you tell them. At MB training class 1974 I was taught that the temp correction was about 30-35% of the total fuel calculation. That is if I remember correctly.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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