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Old 12-20-2002, 11:17 AM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
air pump

My air pump is acting up. Any reason why I should not just disconnect the power to the clutch and not use it. I believe it is only used during the cold start to help the cats?
On a 1991 560SEL
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Old 12-20-2002, 03:17 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Simply disconnectng the power to the engagement clutch will stop the pump from feeding air to the head, BUT, the ECU also sends an electrical signal to the Switch-Over-Valve that supplies vacuum to the the AIR valve between the pump and the head AIR ports. [ this feed signal is in parallel with the clutch power feed and are the same ].

Unplugging clutch for non AIR system operation also requires SOV dis-connect and/or SOV/AIR valve vac line plug/BBing......
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Old 12-20-2002, 03:57 PM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
disconnect on the air pump is done. But where do I plug the vacuum line or disable the SOV.
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