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Hi all
Had a strange problem develop over the last two months.

When cold, engine will turn and then die just before it fires up. Always fires up second time I try to turn it on.
When hot (or even just after that first start), fires up immediately every time - no issue.

Scanned with INPA and PA soft - both reported crankshaft sensor. Got OEM and replaced (measured etc)

Same problem after changing. So now I'm not sure if it's even the crankshaft sensor any more. I can hear the fuel pump priming in POS II..

Anyone seen anything like this before?

S62 engine // 99 build year E39
 

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My car which is a 7/99 EUR RHD build has the same symptoms. (I do not have any fault codes although my SAP is turned off and secondary O2 sensor faults disabled)
There is a very old post saying it’s the charcoal canister - but I don’t believe it is.
What I have noted with my car’s symptoms is:-
  • It won’t do it for weeks if I have previously charged the battery with a charger (the battery is 6 months old and had the same symptoms with 2 previous batteries).
  • If I turn the key to pos. II for 2 secs before cranking it will always start first time.
I suspect my issue is the unloader relay but I haven’t replaced it yet.

 
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