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Old 10-11-2003, 12:16 PM
stevebfl stevebfl is offline
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Join Date: Mar 2000
Location: Gainesville FL
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Usually my first step is to push down on the airflow plate with my finger and see if the system responds to the richer mixture.

I then disconnect the O2 sensor and verify the ability to give a 50% fault code. If it does then I would try readjusting to the proper point.

One must understand that there is no significant difference inmixture between closed loop at 90% and closed loop at 50%. If the system reached the end of compensation somewhere in the high 90 percentile, immediately it would only be slightly different mixture than at closed loop 90%.

Mixture is held to a very tight tolerance when in closed loop and the car can run perfectly significantly above or below what is achieved in closed loop.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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