When I drained the oil on my 1989 740 wagon this weekend during a routine oil change I poured about a pint of oil down the pipe that holds the flame arrestor leads to the oil seperator. I did to see if the oil seperator was clogged - it didn't appear to be because oil flowed out of the drain on the oil pan. I removed the flame arrestor before I poured the oil into the pipe through a same funnel. I also cleaned the flame arrestor.

After replacing the drained oil I found it difficult to start the car but after starting the car runs normally. This happens every time I start the car and it hasn't been used for several hours. If I start it a few minutes after it has been running - no problem. The car won't start when it is cold until I step on the accelorator a few times.

I checked the large hose that runs from the flame arrestor to plastic pipe that connects the air mass meter to the throttle body. It contained many small black particles that appeared to be burnt oil. Further checking revealed that oil was in the plastic pipe that connects the air mass meter to the throttle body. I cleaned the particles out of the hose and removed the oil from the plastic pipe and wiped it clean. I suspect all the oil had not passed through the oil seperator and when I tried to start the car some of it passed through the flame arrestor and the large hose into plastic pipe.

Could some of the oil have gotten into the throttle body and clogged something that effects cold starts? After difficult cold starts the car runs normally.
Any ideas on what the problem could be and how to correct it?