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Old 11-17-2012, 06:10 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
Join Date: Apr 2007
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Mein Auto: '02 530i Sport auto
The e39 SAP delete appears to be an urban legend. Some claim to have had success with the e46 but I have yet to find an e39 that has sucessfuly completed this action. As PM, clean or replace the SAP check valve every 100K. The SAP check valve opens to allow air to be injected into the exhaust stream. Because it is part of the exhaust stream, it gets carbon deposits that can impair opening or closure. If it fails to close, hot exhaust will enter the air pump, where the moisture will condense and kill the pump. This can get expensive. My previous e39 went through 3 air pumps in 75K. My current one is still on the original at 108K. Go figure...
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