Updating my previous post above. Another cool Florida morning (50's F) -- low idle surges remain and codes are back:
P0170 fuel trim bank 1
P0173 fuel trim bank 2
P1188 fuel air meter
P1189 fuel air meter
P0305 Cyl 5 misfire
P0306 Cyl 6 misfire
I believe the misfire codes only appear if the car sits and idles with low surges before it is warmed up.
I thought the CCV to dipstick hose may have fixed P1188 and P1199 but they are back. Onward with more vacuum leak hunting... I ordered an intake boot (elbow is prone to leak) and will replace that when I do my idlers / alternator / and OFH gasket next week. Original CCV / DISA / VANOS at 121k but no failure symptoms.
93 740i (Sold)
00 740iL (R.I.P.)
Last edited by ndz; 11-25-2013 at 04:36 PM.