w211 220cdi facelift 06 reg will crank won't start,

[SHAMGIT]

128,000 miles,
car driving perfectly,engine sweet
after 50 mile run parked up,
10 minuets later car would crank but would not start,
battery 2 months old,lots of power,
tried 5 times then left it for 30 minuets ,
car then started first time,
this will obviously happen again so got to figure it out,
no codes coming up on carsoft reader,
4th injector has got a slight leak from seel which has
been there a week ,
not getting worse but will get fixed in near future before it gets black death,
am i right in looking towards the crank shaft sensor,could it be breaking down,
did notice that it may need a new thermostat ,
on that 50 mile drive outside temp was virtually freezing,
engine temp only got to just over 60,
half rad blanked of,
any help on the starting problem would be appreciated ,thanks,

 

[Uncle Benz]

I'd go with crankshaft sensor as most likely culprit, although I have replaced a few camshaft sensors on this engine too.

 

[AMGeed]

+1 for the CPS.
Exact same symptoms as mine.

Engine temp should be reaching 85C -90C so yes, new thermostat as well.

 

[HITECH]

Don't know if my fault is related or not. Just last night and today. When I turn my key to start the car it cranks over no problem 3/4 times then cuts off instantly. No spluttering, no backfiring. It cuts out and I can hear what im assuming is the wirr of the fuel pump spinning down. Weather is absolutely Baltic so im hoping its a tempreture related fault. Ive been running the car for a few weeks lately aswell with the MAF disconnected as it runs better power wise. Is this similar to your fault SHAMGIT? My car is a 54 plate C220 CDI.

 

[Westheath]

Get it on MB Star diag

Looks like MAF is faulty.

 

[HITECH]

Get it on MB Star diag

Looks like MAF is faulty.

Im at work on a nightshift so not had a chance to scan it myself. Ive got good legit Delphi and few other progs for live scanning. Im sure something is gonna flag up when I plug the laptop in ok. Just while Im at work thinking bout it, its doing my head in what it is. When it done it I had a generic scanner in the car so done a quick scan with it but it didn't show up anything on it. Why do you suggest MAF? Could it be something as silly as a choked CAT. Its new ground to me because I have never ever had any of my cars give me starting problems due to me keeping them serviced regularly and forced regens regularly as I don't always trust cars to do a regen automatically like they should (if they have a DPF).

 

[HITECH]

This turned out to be a starter problem. The wirring sound was the starter gear not coming out far enough to crank engine over or slipping back a slight few mm. Enough to miss, stop engine from turning over and just the electronics of the starter could be heard. This was a temperature related fault. Lack of lubrication or icicles in the wiring/internals.....not quite sure but just updating this post, it was nothing fuel related.

 

[Westheath]

Ermmm ........what about this then ?

Don't know if my fault is related or not. Just last night and today. When I turn my key to start the car it cranks over no problem 3/4 times then cuts off instantly. No spluttering, no backfiring. It cuts out and I can hear what im assuming is the wirr of the fuel pump spinning down. Weather is absolutely Baltic so im hoping its a tempreture related fault. Ive been running the car for a few weeks lately aswell with the MAF disconnected as it runs better power wise. Is this similar to your fault SHAMGIT? My car is a 54 plate C220 CDI.

 

[Taffy7hfa]

Bot.

 

[HITECH]

It was nothing to do with fuel pump guys. Was a starter fault. Was a bit confusing at first to locate exactly where the wirr noise was coming from. I did at first suspect fuel but was nothing to do with fuel. Its all been good since. Cheers.