Long crank when cold

[VictorH]

Need your advice. I have an E90 M3, 156,000 miles with DCT owned by me since new.
In the last 2-3 weeks my car has developed a long, first thing in the morning crank (cranking speed is really good and fast). If I keep my foot on the brake it will crank for 10+ seconds before it just slowly catches. If I stop the initial start attempt and try again, it will start right up. I have no codes despite checking with my code reader several times. Car runs and drives fine with no issues.
My plugs were at 30,000 miles so I changed them with OEM NGK plugs but no effect whatsoever. I’ve heard that sometimes a faulty crank position sensor can cause this type of problem, and replaced my original unit with a replacement unit (Hella) and again, no change in the symptoms. My throttle actuators were replaced (both) at 90,000 miles due to limp mode. I replaced the idle control valve at about 120,000 miles when I had stalling after cold start and my starter had gone out (fixed both issues). The coils are original, but no codes or misfires and my car sees significant track time (4-6 events per year, except this year, will only do 3). The car otherwise runs well and when warm will start right up. If the car sits all day at work, then I will have a similar long start like in the AM but perhaps not quite as bad. Ground wires look good, removed block to chassis ground wire on the driver’s side and it was good, reattached with some conducting grease. The battery is less than 1 year old and even when on trickle charger overnight, still no luck and don’t have other signs of low voltage. What else do you suggest I try?

[amrazM]

You may want to check static fuel pressure with the ignition turned on.

any tune on the car?

[1MOREMOD]

Mine gets shorter when cold

[///M Power-Belgium]

Originally Posted by 1MOREMOD

Mine gets shorter when cold

Reaction from nature mate .

[Helmsman]

Originally Posted by ///M Power-Belgium

Reaction from nature mate .

Hey, long time Phil, all good I hope?

Cheers
Nik

[Helmsman]

Originally Posted by 1MOREMOD

Mine gets shorter when cold

. ........

[///M Power-Belgium]

Originally Posted by Helmsman

Hey, long time Phil, all good I hope?

Cheers
Nik

Hi Nik !

Let's say I'm still essential ( on paper as well )

Yeah Nik I'm fine , despite in this difficult time with that damn COVID virus .
Thanks for the concern ! Stay safe and healthy my friend !

Cheers !