750i abnormal cranking

[Eagle]

A friend of mine just brought a 750i, idle and power are fine but sometimes(hot or cold doesn't seem to effect it) it takes longer to crank ranging from 2-4 seconds other times i fires right up no problem

Sometimes check control comes up as it cranking just before it fires then it disappears.
Does have a puff of black smoke when it starts i noticed, not sure it it always does this or if it is related.

I was thinking maybe a bit of a injector blockage?

But any ideas much appreciated

Cheers

[Eagle]

E32 by the way

[filip00]

well, if the injectors weren't tested as you know it, go and test them and clean them if necessary, that couldn't harm it.

[Ross]

Injector(s) leaking down after shut off causing flooding.

[Bin_jammin]

Doesn't that car have a pressure accumulator to maintain fuel pressure to ease the next start?

[Tiger]

Don't forget the crank position sensor... more likely than injector... If it is injector then you would know when you hook up pressure gauge or spark plug for fouling.

[Bin_jammin]

Don't forget the crank position sensor... more likely than injector... If it is injector then you would know when you hook up pressure gauge or spark plug for fouling.

and a bad injector would likely give you a skip, which you're not complaining of.

Or, if you'd prefer I not dangle a participle, A bad injector would likely give you a skip, of which you're not complaining.

[CharlesAFerg]

Hmm... Shogun will have info on this in the section of his other boards relating to common problems, I recall this being one of them.

[Eagle]

thanks for the advice ill pass it on, test cps then get the injectors cleaned. I would check the plugs if i could be bothered but being a v12 i dont want to, dont think he does either :D.