Most of the new electronic controls replace simple mechanical "dumb servos" with "smart" electronics. As usual, the more complex, the more complex the failures, the more diffucult the diagnosis, and the more expensive the fix -- usually complete computer replacement.

I'm convinced most of this is just computer idiocy. The AC controller doesn't need to know the mixture, nor vice versa.

Networked controls are worse, not better -- and both are pretty much unnecessary.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!