Balancing Fuel Rate on CR 5.9 injectors

[y2konyxss]

Hello,

I have a 2005 5.9 CR and I wanted to do a quick scan with HPT and found that my balance rates are not consistent on the injectors.

Does anyone know what the allowed difference would be between injectors?

im getting:
Inj1: - 0.9mm3
Inj2: +0.1mm3
Inj3: - 0.1mm3
Inj4: - 1.7mm3
Inj5: - 1.5mm3
Inj6: + 4.0mm3

immediately I'm thinking inj6 is no good.

[poulioteri]

Hello,

I have a 2005 5.9 CR and I wanted to do a quick scan with HPT and found that my balance rates are not consistent on the injectors.

Does anyone know what the allowed difference would be between injectors?

im getting:
Inj1: - 0.9mm3
Inj2: +0.1mm3
Inj3: - 0.1mm3
Inj4: - 1.7mm3
Inj5: - 1.5mm3
Inj6: + 4.0mm3

immediately I'm thinking inj6 is no good.

AFAIK, the general rule is +/- 4 for each injector. The difference between injectors isn't as important. Don't quote me. How many miles are on these injectors? What do the rates look like under load? Mine vary between +/- 3 at idle, but converge to 0 like a German clock under any load. Someone correct me if I'm wrong.

[2007 5.9]

+\- 1-2 is a healthy injector
+\- 3 is a weak injector
+\- 4 is a dead injector

[2007 5.9]

Your #6 is either getting ready to roach itself or the needle is sticking

[y2konyxss]

Your #6 is either getting ready to roach itself or the needle is sticking

This truck is running extreme tune, so I revert it back to stock and validate then? Also I was just testing scanning of truck When it was cold. I should let it warm up and take another measurement to be sure. Should I measure in park idle? Or in drive with brake on?

Sounds like I might want to price out a new injector for the truck.

[Turbo_Mike]

This truck is running extreme tune, so I revert it back to stock and validate then? Also I was just testing scanning of truck When it was cold. I should let it warm up and take another measurement to be sure. Should I measure in park idle? Or in drive with brake on?

Sounds like I might want to price out a new injector for the truck.

If your truck has over 150k on it, I'd suggest replacing all injectors, or you are just going to be chasing them as they fail. The 04.5 up injectors dont last that long.

The tune shouldnt affect injector balance.

[Bdubbz]

I can't seem to get the balance information to come through on the 03 computer. Does anyone know if its supported on the early computers?

[2007 5.9]

2003-2004 are not supported for balance rates

[y2konyxss]

there is about 70K on current build, it got all new injectors at that time. wish I knew the later CR 5.9 had injector issues. I sold a 6.4 to get a Cummins for more robust motor... lol whoops

[2007 5.9]

there is about 70K on current build, it got all new injectors at that time. wish I knew the later CR 5.9 had injector issues. I sold a 6.4 to get a Cummins for more robust motor... lol whoops

Saying that late CR have more injector issues is simply false.

#1 cause of injector failure is contamination. Not one year is less subject than another.

There are many thousands of trucks with over 100-200-300k on a stock set..

[poulioteri]

Saying that late CR have more injector issues is simply false.

#1 cause of injector failure is contamination. Not one year is less subject than another.

There are many thousands of trucks with over 100-200-300k on a stock set..

Agreed. 225k on factory set. My LB7 Duramax had injector issues.

[hemi426]

As a cross check.

Try using a digital inferred pistol. Point it at the exhaust port on each cylinder. They should be within 20 to 40 degrees of each other.

OEM fuel filter is 2 micron. I have a secondary 1 micron after the OEM filter. 165,000 on my injectors.

On Dodge Cummins forum there is a wealth of injector info. If it were my truck I would add a quart of cheap ATF to the fuel tank and see if it cleans up the injector. Old school trick...

[RandomEnthusiast]

Atf or 2 stroke oil to lube em up if you really want to. But there are several tsbs for 5-6 cylinder injectors getting stuck open. I guess because it's the last cylinder to get cooled but I've seen and dealt with the meltdown condition on cyl 5 on an 07. Not fun to tear it down and redo headgasket, turbo, injector and piston.

[jewing3227]

+\- 1-2 is a healthy injector
+\- 3 is a weak injector
+\- 4 is a dead injector

Would you mind to elaborate on what a "dead injector" is? I'm curious because I myself have 2 injectors.........#3 & #4 which were initially logged at +4 & -4 respectively. It appears as one is attempting to cancel the other out. I experienced a small stutter/rough idle (1 sec to 1.5 sec max) upon first cold start with a very small puff of smoke. I did some reading and added a quart of ATF to a full tank. I have ran 1/4 tank through the system so far after logging once more, my rates have backed down some to +3.7 & -3.4. a small change but a change none the less. The small stutter I mentioned has but all gone and there is no puff of smoke anymore. I experience no issue with starting of any kind.......fires right up with the first turnoff the key.


To the OP.....have you considered a quart of ATF with a full tank of fuel? Just a thought.

[muz79]

As a cross check.

Try using a digital inferred pistol. Point it at the exhaust port on each cylinder. They should be within 20 to 40 degrees of each other.

OEM fuel filter is 2 micron. I have a secondary 1 micron after the OEM filter. 165,000 on my injectors.

On Dodge Cummins forum there is a wealth of injector info. If it were my truck I would add a quart of cheap ATF to the fuel tank and see if it cleans up the injector. Old school trick...

The research I've done suggests OEM Fleetguard is 7 micron. Baldwin is 5 micron. Caterpillar 0R-749 and 0R-750 are 2 micron absolute. Testament to this is if I tip my 0R-750 upside down into my hand, I can see very fine brown silt that has passed through the Baldwin and subsequently been trapped by the Cat.

[Mdracing57]

2003-2004 are not supported for balance rates

Does anyone know another way to check balance rates on the 03's and early 04's ? Other than the temp gun. Or if there are any plans to support this ?
Thanks

[wwentzler]

OEM is like 7 micron. Good filtration is key, fass pump filters are generally 2 micron. And NEVER use 2 stroke oil or ATF in any commonrail injection system. This aint no 12 valve.

[jewing3227]

OEM is like 7 micron. Good filtration is key, fass pump filters are generally 2 micron. And NEVER use 2 stroke oil or ATF in any commonrail injection system. This aint no 12 valve.

I ran ATF through mine when I had bad rates in 2 injectors and solved my problem....just saying it has been proven and I myself have been successful with ATF ....never say never.

[y2konyxss]

I ran ATF through mine when I had bad rates in 2 injectors and solved my problem....just saying it has been proven and I myself have been successful with ATF ....never say never.

How long did it take to work?
How much ATF and what kind did you use?

[jewing3227]

How long did it take to work?
How much ATF and what kind did you use?

I used the Walmart brand ATF. I seen that people were putting one quart in a full tank of fuel and decided to up the rate to a quart and a half to a full tank. It took about one full tank and the rates came down to the norm of my Injectors.I also initially had some rough idling on cold startup and it took care of that as well.