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Fuel pressure retention I think is fine because after not using the car for 11 days I turned the key straight to the starting position and it fired immediately. But it did then need one or two seconds of turning over to obtain idle, which frankly it always needs anyway. Once idling it's always steady at 1000 rpm but is lumpy like a Subaru flat-four cylinder.
To get more involved: The problem with the car which is a 190E 2.5-16 is a flatness/lack of response in the low-midrange. Throttle response is laggy and surges. Fuel consumption is average (~320 miles a tank). I tried playing with the EHA adjustment and low down performance improved a lot the more I leaned it out, I was so happy with the car at this point. Top end performance may have tailed off. Then for safety I checked the mixture - at idle it was fine, but at 3000 revs was very lean. Inspecting the number 1 plug also showed a lean colour. So I reset the EHA adjustment and the flat performance has come back. But at least the mixture isn't going to ruin the engine any more.
What gives? I think it must be fuel pressure related because of the difference the EHA adjustment makes.
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