740 GLE starts 100% of the time if the air intake hose to the manafold is disconnected and a shot of Carb cleaner, WD-40, or maybe shaving lotion is sprayed into the TB. This always results in an instant start and smooth run. However if this step is skipped I can crank the car forever and nothing happens. Previously the car would start normally about 1 in 50 times but it is so consistant to have to spray the carb cleaner that I no longer try to start it without doing this. Not always pleasant in Buffalo winters.
Both fuel pumps and fuel pressure is good. Injectors work perfect. Spark is present. Jetronic unit works perfect as well as air sensor (swaped with known working units-no change). Same with fuel relay. Fuses all good and troubleshot.
Tapping hall efect sensor has no effect. Check valve replaced. FPR good.
I suspect I can not be the only person on earth with this experience and would appreicate any input from anyone who has experienced this situation or anyone who might have any suggestions to fix the problem. 4 different garages have not been able to do so. Of course, I suspect a dealer could at $$$$$.
Thanks in advance.