C220 W204 (2009) Injector problem

[Ashtoroth]

Hi All.

I have a 59 plate C220 Estate BlueEff.

I took it in to the local MB specialist to have service and MOT.

I was told that injector 1 was leaking, it required new bolt, washer and reseating. I paid for this.

Since happening when the car is cold its misfiring and is very lumpy under power accelerating.

I took the car back to the specialist, who put the car on STAR. The tell me that injector 1 is offset is too high and it is over fuelling. (it had adapted due to the leek) They tried resetting it, it would not rest. They removed the injector from the ECU and added again.

I am stuck with the problem, it does not run nice. I'm told by the specialist the only answer is a new injector £400+.

Can anyone help, it frustrates me that its just the offset that needs adjusting. Any ideas would be great!

 

[Ashtoroth]

Any thoughts??
Any help??

 

[MBSpecialist]

what voltage are you getting at the injectors?

 

[Ashtoroth]

I have not checked.

Am I checking the voltages with the injectors connected?
What sort of voltage should I be looking for? I know the 3 that are working will give me a good idea.

 

[panason1c]

Since, I assume, the car didnt mis-fire prior to the work being carried out I can only guess that possibly, the old copper washer (under the injector) didnt come out with the injector and remained on the c/head seating, and fitting a new copper washer over it would raise the injector seating position and perhaps cause the problems you have. Just a guess.

If true that the injector 'adapted itself to the leak' one would logically assume it would adapt itself back again once the leak had been rectified.

 

[E270 Owner]

I have not checked.

Am I checking the voltages with the injectors connected?
What sort of voltage should I be looking for? I know the 3 that are working will give me a good idea.

You need to use a break out connector at the injector solenoid with the engine running to verify the voltages.

You can use fine pins down the back of the connectors also.

The injector nozzle might be too far into the cylinder if they used a cutting tool instead of polishing the seat, this will upset the spray pattern combustion and running of the engine.

 

[Ashtoroth]

I am told by the garage that they removed the old washer and polished the head. I trust that it was done, the garage gets great reviews and is trustable (I hope).
They said the ecu made small adjustments as the injector was blowing totalling a big offset. When it was corrected its not possible to correct big adjustments.

They said the offset is in the injector, and to fix it requires a new injector. Its more that I need a £400 injector to correct a setting, throwing away perfectly fine injector.

 

[bob6600]

I agree with what panason1c has said, if it can adapt out, it can adapt back.

If the injector is actually showing out of tolerance in STAR then it should be replaced

Ask them for the printout of the injector tolerances and put them on here

 

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If a slide hammer was used to extract the injector there is always risk if injector damage through shock, irrespective the injector is faulty.