Injectors!!

Dwg_23

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Hello all! I have a 2005 c220cdi
I have a small misfire/splutter at low revs while driving

Plugged into star--no codes

Injector values

Injector 1 -1.47
3 -2.64
4 +2.39
2 +1.71

Garage thinks number 4 can cause the splutter and maybe number 2 is high as its trying to compensate?

Your thoughts please! Thanks guys
 

mersum1es

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Star also says, value which requires a new injector is more than 5. From reading experiences, around 3 values may cause starting problems etc. so not necessarily caused by those injectors.
 
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Dwg_23

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I'm just getting a misfire/ hesitation at very low revs on motorway ect, no codes have come up on 2 plug ins, do you think the injector could cause a misfire at these values?
 

mersum1es

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complete 'misfire' sounds very odd, some irregular rpm is more like usual. Perform a return leak test to the injectors, correction value does not always correspond with those results.
 

drdre78

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last time you change fuel filter?
 
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Dwg_23

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Fuel filter was changed recent, garage can't find anything,
 

mersum1es

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Hi
Please enlighten me. What are these numerical values ?

It's more like balancing the difference between the cylinder, as you see sum of the values is near 0.
 
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Dwg_23

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Replaced injector 4 and that has gone back to minus now
But cylinder 2 has gone up a touch to 2.8 so Maybe that one needs doing now
 
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Dwg_23

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Replaced injector 4, injector 2 has gone to +3 now, rough running and a knocking since swapping injector 4 for a refurbished unit??
 

mattkh

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Hi
Please put up a picture of an injector that you have removed. Cheers.
 
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Dwg_23

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Hi it's been the garage I haven't got them,
 


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