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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