Injector classification/coding often comes up as relates to T1N injector changes.
My opinion.
If the engine is running correctly you are ok. It isn't like the injectors are going to be so far out of whack that overfueling could be a problem. I suspect that the injector coding is related to emissions compliance more than actual operation.
This is a collection of some posts, not really a Database worthy thread. More detail can be found by going to the original posts/threads.
Early 2004 T1N OM647 Engines may not respond to programming for injector change outs.
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Opinion for newer NCV3 engines.
My opinion.
If the engine is running correctly you are ok. It isn't like the injectors are going to be so far out of whack that overfueling could be a problem. I suspect that the injector coding is related to emissions compliance more than actual operation.
This is a collection of some posts, not really a Database worthy thread. More detail can be found by going to the original posts/threads.
Dennis,
Thanks for the additional information. I always appreciate your input.vic
Please add that info to your signature.2004 Sprinter 2500 T1N OM647.
You should be fine if coding isn't available to you. I was unable to code my early production 2004 when I changed all 5 injectors. It has been running fine for many, many miles since. (knock/touch wood)
There is a company that has a great tune from 2005-2008....It wont work on a 2003
I would like to purchase it but he never tried it on a 2004......
He would not guarantee it would work on a 2004......its the mystery year for him
Does anybody know the differences in these years when it comes to the engine/ecu/ecm
Thanks
I can't answer your specific question, but there may be a break point in the 2004 ECM's. The reason I say that is in a recent thread Doktor A mentioned that when replacing injectors the early production North American 2004 OM647's do not respond to injector coding. The later ones will. That indicates to me that there are two versions of either mapping or ECM architecture within the 2004 model year. FWIW. vic
As always, clicking on the blue arrow icon within the quote box will take you to the original thread/post. In the case of the post immediately above it will take you to much more technical information....
I haven't heard it referred to as "tuned", but I suppose that fits. A more common term is "coded".
My take on injector coding.
The injectors are not able to be manufactured to strict standards. The size of the "squirt" can vary. The injectors are tested and assigned a number code which relates to the "squirt" quantity.
When a new injector is installed then the specific injector code number can be submitted to the ECM (engine computer) so the injection quantity is a known value to the computer.
The ECM constantly monitors the engine operation which includes varying the injector "squirts" based upon feedback.
I replaced all 5 injectors in my 2004 with Bosch factory reconditioned injectors. As happened to your mechanic, I was unable to get the ECM to accept the new injector codes with my DAD. I never did code my injectors. My engine has been running fine for many tens of thousand miles.
My opinion.
The injector coding helps the ECM to trim in the fuel quantity more quickly after new injectors are installed. Because the ECM is constantly monitoring and adjusting the injected quantities based upon feedback, my theory is that eventually the ECM gets the injected quantity trimmed in whether the new injectors were coded or not. I stopped worrying about it quite quickly for my engine although I would have preferred to code my injectors.
All that said, I readily defer to any professional Sprinter technicians who disagree.
The following documentation should help to support my ideas above. vic
Good luck. vic
Early 2004 T1N OM647 Engines may not respond to programming for injector change outs.
'06 engine into an '04 chassis is a plug and play swap.
I would however record the injector 'programming numbers' on paper in case your '04 ECM allows for injector programming. Early '04 ECMs do not program injectors.
Doktor A
I can't answer your specific question, but there may be a break point in the 2004 ECM's. The reason I say that is in a recent thread Doktor A mentioned that when replacing injectors the early production North American 2004 OM647's do not respond to injector coding. The later ones will. That indicates to me that there are two versions of either mapping or ECM architecture within the 2004 model year. FWIW. vic
There is a company that has a great tune from 2005-2008....It wont work on a 2003
I would like to purchase it but he never tried it on a 2004......
He would not guarantee it would work on a 2004......its the mystery year for him
Does anybody know the differences in these years when it comes to the engine/ecu/ecm
Thanks
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Glad to hear that you are up and running.
I haven't heard it referred to as "tuned", but I suppose that fits. A more common term is "coded".... they were supposedly set up correctly an all but he said you are supposedly supost to tune them .. and his fine 35K machine will recognize them but can not talk to them... thanks to all
My take on injector coding.
The injectors are not able to be manufactured to strict standards. The size of the "squirt" can vary. The injectors are tested and assigned a number code which relates to the "squirt" quantity.
When a new injector is installed then the specific injector code number can be submitted to the ECM (engine computer) so the injection quantity is a known value to the computer.
The ECM constantly monitors the engine operation which includes varying the injector "squirts" based upon feedback.
I replaced all 5 injectors in my 2004 with Bosch factory reconditioned injectors. As happened to your mechanic, I was unable to get the ECM to accept the new injector codes with my DAD. I never did code my injectors. My engine has been running fine for many tens of thousand miles.
My opinion.
The injector coding helps the ECM to trim in the fuel quantity more quickly after new injectors are installed. Because the ECM is constantly monitoring and adjusting the injected quantities based upon feedback, my theory is that eventually the ECM gets the injected quantity trimmed in whether the new injectors were coded or not. I stopped worrying about it quite quickly for my engine although I would have preferred to code my injectors.
All that said, I readily defer to any professional Sprinter technicians who disagree.
The following documentation should help to support my ideas above. vic
View attachment 55165
Particularly note the first sentence below:
The ECM compensates for both injector variations due to production tolerances as well as due to injector wear over the life of the injector.
View attachment 55161
View attachment 55162
View attachment 55163
20140522 edit: Given the 3200 RPM comment above, it may be more critical for injector coding if you often operate above that engine speed. I typically do not. On the other hand, above 3200 RPM a bit of difference in injector balance may just not be that critical as all the fuel injected will be burned efficiently.
View attachment 55164
As always clicking on the blue arrow icon within any quote box will take you to the original post/thread. In this case there is documentation that didn't transfer with the quotes.Thanks for the details and percentages.The bosch factory trim is only +/- 3% on flow based on the "master" injector. It does not even have a trim for solenoid response variance (time from energizing solenoid to flow nozzle needle opening). Many other fuel injector manufacturers use the second trim.
The fuel balancing in ecm compensates flow +/- about 7%. It should hide a classification mismatch no problem. ...
That is good to know. vic
P.S. - I would have just clicked the "Thanks", but I didn't want it to appear that I was just thanking you for support of my theory, and not thanking you for your percentage details and insight.
Edit
In another thread it was revealed that Skydiver007 changed his injectors AND the ECM at the same time. That may be a factor in how critical the injector classification is. I swapped out 5 injectors with no ECM change or classification with everything running just fine. Maybe my ECM had already compensated for my particular engine so the new injectors were in range. Or maybe I was just lucky.It was critical on my 05. It ran like **** when the injectors weren't coded. In the pictures you show the code is AAPT75.
Try coding one at a time. All 5 did not work with a DRB or DAD. One at a time worked fine on the DRBIII![]()
Another thread. (I didn't skim/review it tonight.)
ticking after injector change out
https://sprinter-source.com/forum/showthread.php?t=37763
vic
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It would be wrong to recommend not coding the injectors if at all possible. It will not be terminal to use the van until that can be done.
I never did code my 2004 injectors. The injectors were installed May, 2011 220,000 miles. 8 years 100,000+ miles ago.
vic
Added:
Opinion for newer NCV3 engines.
I can't speak for the newer engines, but I installed 5 each injectors in a T1N OM647 engine and never did classify/code them. May 2011. 220,000 miles now at 335,000+ miles.
My opinion.
If the engine is running correctly you are ok. It isn't like the injectors are going to be so far out of whack that overfueling could be a problem. I suspect that the injector is related to emissions compliance more than actual operation.
The ECM aka ECU has the ability to monitor and adjust flow rates over time.
Injector Classify Program Code Coding Misc.
https://sprinter-source.com/forum/showthread.php?t=63175
vic
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