Strange 535i starting Problem???

[Bill R.]

always start with the basics. First make sure that you're getting fuel, regardless of the fact that the pump was changed 3 weeks ago. Check the pump and make sure that fuel is getting to the fuel rail and that it has adequate pressure, Then you make sure that you're getting spark, first at the coil, then at the plug, this process narrows it down , you can get spark at the coil but not at the plug if the cap,rotor,wires, or plugs are bad. If you can verify that you have fuel and spark, then you're next step is to determine if the injectors are opening. These steps will get rid of most possibilities for the cause, check fuel , fuel pressure, check spark and check fuel injector function. In the space of about 10 minutes you can narrow your choices way down. Otherwise just start changing sensors randomly.

I didn't want to do this but looks like I'll just have to start replacing sensors one by one to see which one it is.

So no one has had this Cold Start Problem???

[islandphile]

Thanks guys...I've checked spark at coil (brand new 2 days ago) and at the plug...all is well (New wires, plugs, rotor & cap 2 months ago). There is good pressure at the fuel rail, the regulator is 2 months old also.

I'm not sure about the injectors (the milege is excellent since I had the head ported & polished and installed EAT chip and K&N filter), but once I get her started it runs perfect & starts perfect until dead cold.