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Mercedes Benz
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1991
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300E 4MATIC (124.230) L6-3.0L (103.985)
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Engine
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Tune-up and Engine Performance Checks
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Air/Fuel Mixture
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Specifications
Air/Fuel Mixture: Specifications
AIR/FUEL RATIO
On/Off Ratio
[1]
Readout Oscillating at 50% ± 10%
[1]
At Diagnostic socket, with on/off ratio tester, and 02 sensor connected. Reading should be within +10 of the value at 2500 RPM.