When I replaced my EHA on my 420 it took a couple of adjustments to get it to run correct. Then the duty cycle had to be reset. About 1 1/2 hours of playing with it and now she runs like silk, and no gas smell. Also my milage improved to 22.6 on the highway. Not bad for 80mph and a very big car.

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Sold 82 300TD 205K
Sold 85 300SD 310K
85 380 SE 160K Daughters
90 420SEL good Ebay Buy
92 E350 7.3 251K
88 F350 7.3 211K Farm Truck
84 300SD waiting for Engine