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Exhaust - What are these ports used for?

   
Old Sep 30, 2016 | 12:18 PM
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Nichals's Avatar
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Default Exhaust - What are these ports used for?
I hope these are for O2 sensors? that would make life easy.

This is in reference to a 1991 240 NA
 
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Old Sep 30, 2016 | 04:10 PM
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normally a O2 sensor would be on the front of the catalytic converter... I suspect that port might be for a gas probe for testing the FI, was useful on LH2.2 where the MAF had an adjustment for idle CO
 
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