[W126 Coupe] CIS-E Blues

[Robert Karl Stonjek]

Have you tried replacing the EHA? I know you state the coil resistance is correct, however you mention during reving the current goes to -9mA, when it should be enriching. As you know, current has to be measured passing through the component, so the problem can be at the source, or the load, or even a bad ground. 

I would be certain its not the EHA first. If all else fails, you can try putting a diode before the EHA to prevent that negative current and hesitation. You can also try keeping the WOT switch closed, which will force closed loop operation. 

-Anuj

The EHA appears to be working fine.  Having a background in electronics, I know how to test such devices and what to expect under fault conditions.  The current can only reverse if the driving device reverses it - the EHA can not be responsible (it is a 'passive' device).

The WOT switch sounds promising.  What does 'WOT' stand for and where do I find it?

Thanks,
Robert
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