03-01-2013, 10:20 AM
(03-01-2013, 10:13 AM)cwspellowe Wrote: Sounds like throttle arm to me too.
I'm assuming you didn't remove the top of the pump at all, and you definitely didn't touch the governor? If so, only thing it can really be is the throttle arm. The ECU-controlled part of the pump controls timing, so if something's been disturbed on the throttle arm to affect fuelling at idle the ECU will be reading default values which will be mechanically out if the arm's out by a spline or two.
Just my thoughts anyway. Rip it off and fit a mechanical pump ftw.
I've been pondering this since my post and I think this is correct. The mistake I made was not marking the arm before I removed it. I turned the shaft to normal idle speed and just refitted the arm. Now it makes sense, the angle sensor on top of the throttle arm must have some effect on the injection timing, and the arm won't be where the ECU expects it to be! I will report back after some fiddling.