Try this thread.....

http://www.peachparts.com/shopforum/showthread.php?t=261264&highlight=smog+pump

By the way, the smog pump can also be disabled by simply removing the magnetic clutch disc on the front of the pump. To do this insert allen key in front of shaft to prevent shaft from turning, then use wrench to remove nut on front of pump. When magnet is signaled to engage, pump internals will not turn because the internal shaft will not magnetically clamp to the serp belt pulley drive..... This method does require a functional pulley bearing.

(you will still pass a visual smog inspection but you didn't hear that from me.....)

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles