Vito won’t start when warm

[R4mos]

Hi I’ve got a Mercedes Vito 2006 109 and it is very difficult to start when warm even from cold it can be hard to start , fuel filter , fuel rail & sensors , injectors,cam & crank sensors even ecu all been replaced but still the same please has anyone had this issue & cured it

 

[mattkh]

Mileage..?
You dont mention glow plugs. Whats the story on those..?

 

[R4mos]

Sorry yes also replaced

 

[R4mos]

Milage 103000

 

[Blobcat]

Perished run back tubes always caused issues with poor hot starting.

 

[MinionBob]

Perished run back tubes always caused issues with poor hot starting.

I'm intrigued - what's a run back tube? Do you mean leak off pipes from injectors?

 

[Blobcat]

I'm intrigued - what's a run back tube? Do you mean leak off pipes from injectors?

Yes, they can perish have small cracks in that let air bubbles in.

 

[john campbell]

Also have the compression checked to rule out any internal problems with the engine.

 

[R4mos]

Thanks for replies dont think it’s a compression fault as engine runs perfect once running

 

[mattkh]

Thanks for replies dont think it’s a compression fault as engine runs perfect once running

Fully charge the batteries and see if it makes any difference.

 

[R4mos]

Ok I’ll charge battery but van can be stood for weeks & starts up better than when it’s warm

 

[mattkh]

Thanks.
Do you know the engine code..?

 

[R4mos]

Got the engine number if this helps
64698151275731 can try & get code tomorrow

 

[mattkh]

Thanks. The first 3 numbers above is the engine code.
Its a OM646.
Thanks

 

[mattkh]

Sorry yes also replaced

Do you have the old glow plugs..?

 

[R4mos]

Yes

 

[mattkh]

Yes

Thank you.
Please put up a picture if you can. Apparently, on your car engine, they have to be the ceramic ones. I do not know if I can tell the difference between the two types.

 

[R4mos]

Ok I will get a photo but the ones I took out were original merc ones which I assume were correct & by replacing them it hasn’t made any difference at all to hot starting

 

[R4mos]

 

[mattkh]

Ok I will get a photo but the ones I took out were original merc ones which I assume were correct & by replacing them it hasn’t made any difference at all to hot starting

Thanks. Are the replacement ones also Mercs..?