The fast cranking tells you it is not a battery or voltage issue, but more likely a fuel bleed down problem or an slow to react sensor. (cam or crank) If it is fuel pressure bleed down it could be from the pump, pressure regulator, injectors etc. If it is the injectors it could be washing down the cylinders/rings causing a dry start for the cylinders... Which could explain the fast cranking and different characteristics after different times of sitting.

May be time to bring it in to the dealer since it is easy to reproduce. (and they have the GT1, so can watch the sensors during cranking if no faults are present)

__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

You make something idiotproof, they'll make a better idiot

You think professional is expensive, just wait until you pay for amateur.

Never let your sense of morals prevent you from doing what is right.

Examine what is said, not who speaks.

X5 pics

RIP 4.6is.....

2003 4.6is