Checked current flow in the EHA:

(note: my motor is a m103 3L from a 90 300SEL)
(note: my exhaust is straight pipe)

Resistance: 1.116 M Ohm

Key on, Engine Cold: 19.980mA

Key on, Engine On Cold: 4.819mA

After sitting to ~80C : 16.477 mA

As engine was revved it typically went between 4 and 16mA

As engine was held @ higher rpm started @ high number and decresed rapidly to around two or three mA.

Used this: http://www.home.agilent.com/agilent/product.jspx?pn=34410A

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