AFAIK, cylinders are numbered 1 to 4, looking at the engine from left to right.
However, injectors are numbered in engine firing order, NOT in cylinder order. Hence the confusion.
To make things a bit more confusing, if you have a bar code sticker with 16 digit injector codes on the engine rocker top, the location of the code determines which injector is it for.
P.S. The codes on the sticker are for factory fitted injectors, which might not be the actual injectors currently fitted to the car.
Cylinder 1, Firing Order 1, Injector 1 - Code location on the sticker: Top left
Cylinder 3, Firing Order 2, Injector 2 - Code location on the sticker: Top right
Cylinder 4, Firing Order 3, Injector 3 - Code location on the sticker: Bottom left
Cylinder 2, Firing Order 4, Injector 4 - Code location on the sticker: Bottom right
I'm 99.9% sure this is the way, but someone else can confirm too.
("Yes there are differences in injectors. You need to find out the code for the injector. Will be printed on it somewhere and look like this :- EDJR 000501z. The numbers change but the format will look the same.
Injector 4 is cylinder 4 doesn't matter what the firing order is. Just input the code for injector 4 where it says injector 4 or cylinder 4. " )
Which is obviously at odds with what you say above. I'm not trying to stir it here, honestly - but I need to know which is which, otherwise coding the wrong injector is pointless, obviously.
Why isn't the convention simply to refer to the injectors as "Injector in Cyl No..." Which would stop all the confusion?
Of course I understand the firing order is not 1-2-3-4, and I understand why it's different, and that the PCM will want the injectors to be coded in that sequence, but I just don't understand the reason for numbering the injector in cylinder 4 as No 3!
In addition, on the sticker on the engine cover, the injectors (with codes) are numbered by cylinder number - not 'injector number!'
Given that the DTCs are written in firing order terms P2339 refers to the fourth cylinder in the order 1342 (starting at #1) so the answer is what we would call cylinder #2. i.e. The second along counting from the chain case end.
Have some doubts, and found this topic which should be the most suitable one for my questions.
I have a '09 mk4 Mondeo 1.8 TDCi.
When reading the "cylinder balance / contribution" on FORSCAN what is the correct correspondance between cylinder - injector?
cylinder 1 = injector 1
cylinder 2 = injector 2
cylinder 3 = injector 3
cylinder 4 = injector 4
or
cylinder 1 = injector 1
cylinder 2 = injector 4
cylinder 3 = injector 2
cylinder 4 = injector 3
I think it must be this last option, since a few months ago I have checked the cylinder balance and "cylinder 4" on FORSCAN was going down up to 0.6 and a few weeks ago, I had to replace the injector on the 2º cylinder (counting from left to right, standing in front of the car) due to a leak.
Thank you for answering! I have seen that picture before, but wasn´t very sure... So I was correct, right? Just to be sure, when checking the balance / contribution on Forscan, the cylinders are ordered by firing order and not physical order (1-2-3-4 standing in front of the car), thus on Forscan "cylinder 4" is in fact cylinder 2 when standing in front of the car.
No idea why they number it that way instead of a simple cylinder number.
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