Thanks Peter, I will try the EHA current.
As for the vacuum leak I will check that as well, but one thing I noticed is that there are two auxiliuary air valve (if I am calling the correctly) on the intake manifold close to the EHA, one of them is connected to the booster but the other one which is closer to the engine has no hose on it, so it is not connected anywhere. Is it supposed to ?
'88 Benz 420 SEL
'79 Porsche 911SC ('87 Carrera Engine)
'00 BMW 540 Sports Package
'99 Land Rover Discovery
86 300E - Manual (sold)
88 260E (sold)
84 944 (sold)