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Let me try and point something out.
Your car should run real good over a wide range of mixtures. It won't do that if running in closed loop, but you have the EHA disconnected so you are obviously in open loop. (that just means there is no more electric control).
If I were adjusting the mixture the car would feel the same from about a mixture of .8% CO to around 5% CO. This is a huge range. If you set it to 1.5% CO (which would be about where cars were before closed loop control) it should easily stay there indefinitely. IF THAT is not the case there are other factors at work that we have not been discussing.
Basics of engine diagnostics need to be reviewed and don't leave out ignition. Before I would ever be this deep into fuel control I wouldhave watched all the phases with my ignition scope.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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