TDR Injector Column

[DogramTD]

So I was completing my read of this quarters issue of TDR and I came across "A look at injectors" in the From the shop floor column. It struck my interesest because at this very moment my truck is sitting in the driveway with 6 empty hole where the injectors would otherwise fill. I have sent these off to be tested as it seems they have failed, and intend on buying "NEW" injectors and not remans to fill these empty voids.



In this write-up, Andy focuses on the Injector Correction Code (ICC), and states that this is a process of matching injector to cylinder for the 6. 7 which is completed at the plant. So here are my quetions and concerns; are the flow characteristics for that ICC stored in a database somewhere so in the event that specific injector fails, it can be matched? I noticed my injectors had numbers on the bodies as well, (each one different) of which I took pictures of before I sent them off to ensure I received accurate reporting on my original bodies. Are these numbers considered ICC's? Does this injector to cylinder relationship occur on the 5. 9 as well?



The write-up also mentions that minute deviations can cause rough engine operation and chronic no-starts. When an individual purchases from or, replaces their injectors with brand X, these are not cylinder matched, so how do they remedy the possibility of the rough engine operation and chronic no-starts? Are the injectors matched to a ser# stamped engine or are they matched to a respective cylinder on all engines, either 5. 9 or 6. 7?



Just some rambling in my head, what do you think?

 

[TCDiesel]

6. 7 yes , 5. 9 No... The code is the same for each hole . . You just cannot mix them Up... So 3 will not work in 1. 2. 4. 5. 6.

 

[Prairie Dog]

Whats the difference? Flow rate?

 

[Wingate]

I have often wondered if the little Cummins has injector trim files... ????

 

[sag2]

6. 7 yes , 5. 9 No... The code is the same for each hole . . You just cannot mix them Up... So 3 will not work in 1. 2. 4. 5. 6.

The code is not the same for every cylinder. Each injector has a unique code that represents the base flow (and the correction) of the injector. The correction is small, and might cause a rough idle, but not much else. The code has to be entered into the PCM any time it is replaced, or the injector is replaced or moved to another cylinder. If you have a new controller and no codes input it will not start.

 

[sag2]

I have often wondered if the little Cummins has injector trim files... ????

I guess that is a good description, it is a fuel trim correction.

 

[DogramTD]

The code is not the same for every cylinder. Each injector has a unique code that represents the base flow (and the correction) of the injector. The correction is small, and might cause a rough idle, but not much else. The code has to be entered into the PCM any time it is replaced, or the injector is replaced or moved to another cylinder. If you have a new controller and no codes input it will not start.

So by replacing the original injectors with random ones (as in not matched) one could expect some rough idling or starting? Is there a process in matching injectors to cylinders that can be done somewhere other than the factory?

 

[TCDiesel]

The code is not the same for every cylinder. Each injector has a unique code that represents the base flow (and the correction) of the injector. The correction is small, and might cause a rough idle, but not much else. The code has to be entered into the PCM any time it is replaced, or the injector is replaced or moved to another cylinder. If you have a new controller and no codes input it will not start.

As long as its the same hole and (Code) it makes know difference... I"ve done it. .



FUEL INJECTOR ID CORRECTION CODES:







Each fuel injector has a six-digit alphanumeric correction code. The correction code is printed on the intake side of the fuel injector (1) and is used to identify injector calibration. When replacing any fuel injectors, this code must be entered into the vehicles Engine Control Module (ECM) using a diagnostic scan tool. In addition, if a new ECM is installed, use a diagnostic scan tool to program all six of the injector codes from the original fuel injectors into the new ECM.

 

[TCDiesel]

None of this applies to 5. 9... ..... When EFILive arrives we will wipe out this calibration (6. 7)

 

[Prairie Dog]

As long as its the same hole and (Code) it makes know difference... I"ve done it. .

FUEL INJECTOR ID CORRECTION CODES:



Each fuel injector has a six-digit alphanumeric correction code. The correction code is printed on the intake side of the fuel injector (1) and is used to identify injector calibration. When replacing any fuel injectors, this code must be entered into the vehicles Engine Control Module (ECM) using a diagnostic scan tool. In addition, if a new ECM is installed, use a diagnostic scan tool to program all six of the injector codes from the original fuel injectors into the new ECM.

Thanks for explaining this - very interesting. Do you suppose they do this instead of just better flow matching the injectors?
Is this all just to reduce NVH?

 

[Tinman]

Just for my understanding, a good set of flow matched injectors would not need a correction factor? The correction code is only a computer trick to correct mass produced injectors that are not well flow match, correct? Surely, it won't take something as fancy as EFIlive to fix this. I'd think that'd be an easy SMarty program.

 

[TCDiesel]

Just for my understanding, a good set of flow matched injectors would not need a correction factor? The correction code is only a computer trick to correct mass produced injectors that are not well flow match, correct? Surely, it won't take something as fancy as EFIlive to fix this. I'd think that'd be an easy SMarty program.

You still will need the software to do it..... But I see not reason why any down loader could not possess the correction,adjustments,Valves,Etc.

 

[Bob4x4]

The trucks will run with new or different injectors
But will trip code if a wrong number is
Entered

 

[Wingate]

Basically the same as a Cat then. . In some of their engines, the have trim codes (4 digit calibration code used primarily for "fine tuning" each injector to a known value. ) Newer Cats have an alpha-numeric code that translates to a software file that is flashed into the engine ecm for each injector. The engine will run with the wrong codes, but will not let you input a wrong code either.

 

[DogramTD]

Good information, thanks for the posts gents!



New injectors are due in tomorrow, lets hope this fixes my problem. Truck has been yard ornament for 3 weeks now!