not convinced that the disco is pulling as well as it should, so peering under the bonnet for reasons.
pulls pretty well at about 2-2500 revs, but doesn't seem so willing as I'd expect at 3000-3500 sort of levels.
went hunting for stuff to fiddle with in the RAVE thing, and found summat about EGR throttle position sensor, so decided to test that.
The book gives figures for ohm readings, engine warm and stopped. one of 'em, across pins 1 and 3, doesn't vary with throttle position but is within spec (1000-1050 ohms. Is it supposed to vary?
'tother, between pins 1 and 2, does vary, but can't be adjusted low enough to come with the 850-900 ohms that the book specifies, nearest I can get it is about 920 ohms.
and finally, will any of these facts affect the running? I tend to assume that wrong EGR operation could affect it, BICBW - especially if the valve is opening more than it should or at times that it shouldn't. For some odd reason, the EGR operating dingus inside the front wing (where the wiring from the EGR valve and the vacuum tube go to) has in addition to a vacuum supply from the brake servo vacuum pipe another little pipe to the airbox downstream of the filter element. Dunno what that's for.
The manual is typically unhelpful on the subject of precisely how and when the EGR is meant to operate.