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can someone outline the procedure for setting the fuel mixture? 200 1984

posted by  Ken C on  Fri Aug 5 05:26 CST 2005
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last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

Here's how I handled my adjustable AMM on my own '84 240.

My replacement (new, not rebuilt) AMM (because the original was "fried" by the faulty thermostat in the air box, for which I promptly ripped out the whole mechanism -- but that's another story) came without a cover or seal for the adjustment screw. So I followed advice found on this list, and adjusted it* to give exactly 300 ohms, measured between contacts 2 and 6. Then I installed it, and miracle of miracles, it not only worked -- engine ran more smoothly than it had in years -- but it passed a NJ Emissions test a few months later with flying colors (despite 196K miles at that time) -- see below for details -- so I assume this adjustment for the AMM was right on!

[ * from the factory, it had been set at 390 ohms, but I changed it to the aforementioned 300 ohms.]

Dynomometer Test Results for New Jersey testing:
Gas Standard Reading
NOx 1227 33
HC 162 27
CO 0.91 0.02
CO2 -- 14.7

Hope this helps.





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