Paul My 735 has been down for a couple of weeks as I've been recovering from a cold. My initial thoughts were ignition related, but I've gone thru the list of related components and replaced everything, with no change. Mine won't start. Saturday I started on the fuel side of the house. I checked the pump output, and it provides the correct volume. I don't have a pressure gage, but I suspect the pressure is too high and the regulator is shot. I determined this by disconnecting the fuel inlet line from the manifold, and turning the switch. My car instantly started and ran great! Wanting to make certain the problem hadn't magicly corrected itself, I reconnected the fuel line and it again refused to start. As another possible avenue, I also pulled the manifold and checked all the injectors to make certain they weren't leaking when pressurized. They were not. One word to the wise, before you pull the injector manifold or remove an injector, get the injector kit. It comes with o-rings and the hat or cones for the injector tips. The o-rings on your injector will be swolen and won't go back in the manifold, and you might break one of the hats when removing the injector. Check the kit first before you buy, I found one with the hats, and another without, both for the same $8- $10. If you can get a pressure gage, start there, so you know what your dealing with before you tear into it. Mark my 728i -83 is getting too much fuel. idle is very low, about 500 rpm. Engine works fine only in full acceleration. I tested cold start valve and it works fine. What could cause this.
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