[W126 Coupe] CIS-E Blues

[Robert Karl Stonjek]

Thanks Jonathan,
as mentioned in my original piece, I unplugged the EHA and the problem went.  But the CIS-E (KE) unit could no longer have an effect (it does its business via the EHA).

Without the O2 sensor, the KE unit still performs many functions and has plenty of other sensors including engine temperature, throttle valve switch, car speed sensor, rev sensor, air conditioner compressor clutch, altitude sensor and so on and performs functions such as spiking rich when you dab the throttle, enriching the mixture as the revs rise, going full lean when you take the foot off the throttle, and limiting max revs to around 6,200RPM.

Thanks,
Robert


> Does the car do this All the time, ie even if you turn it off and back 
> on again?  I'm wondering if your KE control unit hasn't given up.  I had 
> a similar problem on my 87560SEL, ran all over the car trying to figure 
> out what the issue was, finally swapped out the KE control unit and all 
> was well.
> I find it interesting that you have no O2 sensor..  Makes me curious as 
> to where the E part of the system is taking all it's information from.  
> I always assumed the O2 sensor was necessary for a CIS E setup.  You 
> might try unplugging the KE unit (passenger footwell) the car should 
> still run w/o it and I'd be curious to see if this changed the symptoms 
> etc..
> 
> I'll ponder this some more throughout the day.
> 
> Best Regards,
> Jonathan
> 
> -- 
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