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Discussion Starter · #1 ·
[?] My 87 560 is burning very rich. It is blowing black smoke out of the exhaust and the plugs are black and chalky. I replaced the plugs and it ran great for a couple of miles and then at low RPMS it started missing and smoking again. Your help is appreciated!
 

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Depends on the day!
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That screw (your CO adjustment) is VERY sensative..when you do turn it, it's not whole turns it's fractions of a turn. Keep track of how far you do turn it. Chances are if this just started happening either your EHA has given up or your KE unit is giving issues.

Jonathan
 

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Discussion Starter · #5 ·
I was told to adjust the screw on top of air intake. Does anyone know is that the hex head screw mounted in the front of the fuel distributor? I'm stuck and don't want to make it worse.
 

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Discussion Starter · #6 ·
This did just start happening. Can I rule out the o2 sensor and if so how can I determine the EHA or the KE unit? I was hoping this was a common occuring problem with these cars and would be an easy fix Thanks for your help!
 

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560 SEL, SEC Koenig
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There could be numerous things that causes this. Unplug the O2 sensor under the passenger carpet and cover and see how the car runs. If it runs the same it could be the O2 sensor, they DO fail and can cause this. You shouldn't adjust the EHA screw until you check out a few more things. Go here and read about it
http://www.landiss.com/mixture.htm
 

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