My Stock Injectors Have Different Part #'s...

[JRussell3176]

I pulled the injectors and found the following numbers on them...



#1 -- R1779-1319 / 06-05-12 / 685

#2 -- F1244-4-7817 / 06. 6. 5 / UC

#3 -- R1779-0775 / 06-05-01 / 685

#4 -- F1244-4-8647 / 06. 6. 5 / UC

#5 -- F1244-4-3279 / 06. 6. 4 / UC

#6 -- F1244-4-8832 / 06. 6. 5 / UC



I'm assuming the second set of numbers is the date code (ie. 06. 6. 5 = June 5th 2006). Going by that it looks like they changed the part numbers in June 2006. I wonder if injectors have anything to do with the '06. 5 changes? Anyone know if there are any differences besides the part #?

 

[JRussell3176]

Anyone else pulled their '06 injectors and found different part numbers like this? #1 and #3 seem to have a completely different part number structure.

 

[betterthanstock]

I read that the 6. 7 has different P/N in each hole for emissions, but maybe they started even earlier. I assume you bought new, so no prior dealer swaps.

I would keep them in the same hole. There are slight differences in operating temperature of different cylinders, so this may be why they are different.

 

[Matt400]

Maybe they are similar to what the D-max is now doing.

To further fine tune emissions they are flow testing injectors and assigning a part number that also contains flow information in a code.



The number is coded into the vehicles ECM for that cylinder so the ECM knows the baseline flow capability and fules that cylinder to exactly match the flow of the other cylinders. Basically you can have 6 injectors all flowing just a tiny bit different but since the ECM knows their baseline flow it can adjust for the difference making them precise.



If an injector is changed, the new replacement should have the new number entered into the ECM so it can bring that injector online exactly with the others.

 

[nickleinonen]

detroit diesel has been doing the injector coding since DDEC1 and the 60 series diesel [late 80's/early 90's]. first it was just a, b or c. now it is 01 - 99. cat has 4 digits i believe on their injectors. i was actually quite surprised that cummins didn't use that on the earlier electronic injectors

 

[rbattelle]

Oh, man, I can't believe they're actually doing things like this. You're basically making every engine a snowflake! Who in their right mind designs an engine where each cylinder gets a special, custom one-of-a-kind injector?

I really don't like the direction fuel systems are going. I blame the EPA.

Ryan

 

[JThiessen]

When I had my injectors replaced, there was a back order for them. They claimed it was because a large percentage of the remanufactured injectors were being sent to the factory. I wonder if those two "R" series injectors you have are remanufactured????

 

[Matt400]

I think the intent is a way to make up for injector manufacturing variances. On the D-max the ECM is compensating for the variance electronically making each injector an exact clone in flow.

 

[JVolpe]

When I had a leaking injector replaced early on under warranty the replacement injector was a R number and was listed and remanufacture part.

 

[betterthanstock]

It's good to know that we are purchasing a vehicle made with new or recycled parts.

 

[MMeier]

Oh, man, I can't believe they're actually doing things like this. You're basically making every engine a snowflake! Who in their right mind designs an engine where each cylinder gets a special, custom one-of-a-kind injector?



I really don't like the direction fuel systems are going. I blame the EPA.



Ryan

I hear you Ryan!!

 

[rbattelle]

On the D-max the ECM is compensating for the variance electronically making each injector an exact clone in flow.

I understand, but c'mon is this level of sophistication really necessary?



Ryan

 

[betterthanstock]

I understand, but c'mon is this level of sophistication really necessary?



Ryan

The ECM has (at least up until 2004 or so) the capability to automatically detect from the crankshaft sensor when one cylinder pulls harder than the others and compensate its fuel duration. But with emissions as strict as they are, I can see that yes indeed they need very strict controls. I think Cummins knows if one cylinder gets a little more, or less air, and to keep EGT more balanced, they would need to match the injector, by placing a bigger injector in a cylinder that gets more air, and vice versa. That's something we could do too, if we had 6 EGT probes, like piston airplanes do.

 

[Matt400]

I understand, but c'mon is this level of sophistication really necessary?



Ryan

:-laf:-laf I know what you mean Ryan, its pretty crazy stuff. Prolly some software engineer thought "hey". . I can write code to clone them all if I knew the base flow numbers.

So they get the injector manufacture to provide flow test codes they can use and find emissions was reduced by some tiny bit so there we are.



Kinda reminds me of the last carburetors that were saddled with mixture control solenoids, throttle position sensors & such where they were trying to squeeze the last bit out before fuel injection.

 

[JRussell3176]

I hate to rain on the speculation parade, but I spoke to a reliable source that said the injectors are not coded and matched to the ECM. It looks like my truck came new with the #1 and #3 injectors being remanufactured though.

 

[Matt400]

Well thats good to know for those wanting to change injectors.

Of course, it was just speculation on the Cummins as I have not data to back that up but GM has adopted this for the 06+ models.

This is from the D-Max service manual-

Injector Quantity Adjustment (IQA) is also referred to as Injector Flow Rate Programming (IFRP) and involves values assigned to each injector after flow testing at the production plant. During the fuel injector manufacturing process, each injector is tested and its flow rate is measured at several points. These measurements are etched as a hex number on the body of the injector before it is shipped to the engine assembly plant. During final vehicle assembly the values are written to the ECM memory.



During engine operation, the ECM uses the IQA calibrations, based on the injector flow rate values, to more precisely adjust the fuel injector quantity for each cylinder. This contributes to combustion efficiency and reduced emissions.

 

[JRussell3176]

Well thats good to know for those wanting to change injectors.

Of course, it was just speculation on the Cummins as I have not data to back that up but GM has adopted this for the 06+ models.

This is from the D-Max service manual-

Man it's scary that GM would do something like that. I hope Cummins doesn't start doing this any time soon.

 

[betterthanstock]

Man it's scary that GM would do something like that. I hope Cummins doesn't start doing this any time soon.

They already are for sure on the 6. 7. We don't know for sure about the 5. 9, but yours seems to prove it. Like I said previously, the earlier ones autmatically test and compensate for up to 10% variation. We don't know if the later ones have that capability, or they rely on the P/N and do not adjust automatically anymore. That would affect you if you wanted bigger injectors, as one cylinder might get too hot, and the ECM would not compensate for it.

 

[JRussell3176]

They already are for sure on the 6. 7. We don't know for sure about the 5. 9, but yours seems to prove it. Like I said previously, the earlier ones autmatically test and compensate for up to 10% variation. We don't know if the later ones have that capability, or they rely on the P/N and do not adjust automatically anymore. That would affect you if you wanted bigger injectors, as one cylinder might get too hot, and the ECM would not compensate for it.

I hope mine isn't setup like that because I just got some 100hp sticks that I need to install.

 

[CDonaldson]

I wonder how many other parts are remans? Good idea to dupe the public by hiding remans where no one would see them, must be some kind of cost cutting edge. Probably all our trucks have these in them, maybe that would explain why only certain injectors fail, already remans that have failed before. Then we get this garbage about dirty fuel, etc to cover up what may be a greater culpret in the failure rates ???? Jut more of that honesty in manufacturing and the modern way of doing business these days.



CD