P0410 Secondary Air
Took off both shutoff valves. After 4 hrs. car running throwing everything I had in cabnet from carb cleaner, brake cleaner, paint reducer, seafoam, carving with coat hanger wire and drivng around the block on 1st gear to keep RPM high it finaly opened up exhaust fumes started coming out from both sides. Cleaned up both shutoff valves put it back together. It's been three days no CEL before it would come on right after the 2nd cold start.

Thanks

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1995 E320
1998 E320
1999 E320 4Matic
2000 E320 4Matic
2000 ML320
2007 C230 Sport
2003 Cadillac CTS