Re: Tickover high and hunting. Tried everything. What next?
I have been following up the breather pipe suggestion by GAZZA82. Very Interesting. I have removed this pipe, checked for leaks etc. The valve did not seem to be clogged. It consists of a light spring and a bit of plastic shaped like a golf tee. I guess it should open against the light spring as the vacuum in the inlet manifold builds up. There is a rubber washer to seal the outer pipe but the valve head has no seal on it, rubber or otherwise. There is a recess that might take one??
Anyway I removed the pipe, valve and all... and plugged the holes both at the inlet manifold and at the cam cover end. The revs become stable and drop to about 1000. Not perfect but lots better than before. Im not sure now if this directly related to my problem or if I have masked the problem by compensating for it somehow.
Alfa diag still does not show any fault codes through all of this process.
I will renew the valve just to see what effect this has. Half of it appears to be inetgral with the inlet manifold. I presume if you buy a new valve it comes as a kit with the removable half of the housing spring, plunger, and washers etc. and only comes from Alfa??
I'll give it a road test when Ive got it down off the blocks. Because it has an auto Selespeed clutch it is inclined to change into gear with a bang if the revs are to high. If it was standard manual you could cope with the high revs more easily.