Yes, .7bar is too much.

This is a very sensitive value. With proper value at .4bar, the normal range of lambda correction between -12ma to +12ma of EHA current will case the differential pressure to range from .3bar to .5bar.

I would pull the electrical connector off the EHA when you are getting those large idle swings in pressure. Either that or measure the current. If the pressure is changing with the EHA disconnected, the most likely problem is a restricted internal flow control oriface. This usually means a new fuel distributor.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician