Poor starting on my w203 C220 CDI O3 Plate

carlh2269

Member
Joined
Jun 26, 2016
Messages
49
Car
c220cdi
Since my last post the garage have replaced all the diesel pipes under the bonnet.
This seemed to have cured the excessive cranking to get the engine to start but it still doesnt seem to fire up as it should. This car has no electrical fuel primer pump in the fuel tank.
It still takes the engine 5-6secs to fire which, when compared to my W203 facelift, is excessive.
Replacing the diesel pipes has definitely cured the excessive cranking as was, but I'm convinced there is still something else thats still not working properly.
During this cold spell the engine sometimes refuses to fire at all. A squirt of Easy Start seems to work to fire it up but its not a cure.
There are no bubbles as the garage bled the system so any ideas would be appreciated.
 

mersum1es

MB Enthusiast
Joined
Aug 9, 2012
Messages
1,602
Location
Finland
Car
W212, C219, W220
can't remember what else you have done but have you measured injector leaks and checked injector electrical correction values (in ECU)?
 

The Mirror Man

Active Member
Joined
Jan 29, 2015
Messages
216
Car
W211 E270 CDI Elegance.Rover 75 Tourer
Im a complete novice with these MB diesels but whet you're describing sounds like a preheater problem.

Funnily enough (read: not funny at all) my E270 was starting fine until last week. Now it takes a few seconds of turning over before it fires up, first thing in the morning. After that, even if I immediately switch off and restart it, it fires up within a second. Only thing that has changed is an engine oil and filter change and an ATF and filter change.
 
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carlh2269

Member
Joined
Jun 26, 2016
Messages
49
Car
c220cdi
can't remember what else you have done but have you measured injector leaks and checked injector electrical correction values (in ECU)?
Injector leak off are all okay.
I'm still convinced the problem is still with the initial diesel uplift or diesel pressure as when started the car runs fine.
 

cheddar

Active Member
SUPPORTER
Joined
May 5, 2017
Messages
402
Location
Teesside
Car
CLK63 AMG, s211 E320 CDI
Have the glow plugs been tested properly? And that they are receiving power when they should?
Easily overlooked on diesels these days, especially on the generation of cars that don’t bring a waring up on the dash.
 

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