My old 730i with 112000 miles on it has a wierd starting problem, which is more noticeable during the colder weather. Crank the starter and it fires ... so i release the starter. But it hasn't started. If i do the same again but hold the key, it fires, throws the starter out, then as the engine hasn't started, it "dings" back in (bad). If i just apply 2 inches of throttle it will start, running on 2 or 3 cylinders for a second or two, then revs up as if nothing has happened. I started thinking it was an air leak, but all hoses are good. Then i tried "flicking" the starter for a second (to allow the fuel pump to run for three seconds pressurising the system) before trying to start ... problem still occurs. The spark plugs are new, as well as rotor and cap.
Would a course of medication be advised (such as injector cleaner). Could the idle mixture (currently at 6 percent) affect cold starting??
-- Regards SDD
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