Hi azhari,

I am also trying to solve these kind of erratic problems. And have installed DIY harnesses for chekcing the relais fuelpump, OVR and switch to set offline the EHA

From what I have read on the principles of these distributors, there is a O-ring gasket on the underpart of the Distributor, on the cylider that commands the fuel flow to the fuel lines and that prevents fuel to enter the air flow. If that leaks fuel enters directly through air intake and mixture always too rich.

Have you taken away the fuel distributor? Would you have any photo ( or drawing from user manaul) of the bottom part of the fuel distributor?

In a previous post you said having measured the fuel pressure , could you tell me how you did it,
Have you done that measurement while driving?.

In advance many thanks, and goodluck.

mine is a 260E, 1988, 370 000km