Hey all. Was into the dealer for tailgate recall. Asked
about getting the flow rates of my injectors checked and asked how
much.



Well........http://www.dieselplace.com/forum/smileys/smiley5.gif



Service councilor said it was a 10 hour job to check flow rates.
And cost was quite high. I said that I thought to replace the
injectors was a 10 hour job.

Didn't bother getting into it with him. I do plead ignorance
here, but am pretty convinced that they can be checked by plugging in a
diagnostic computer into the under dash plug. Plus there is
another thread showing guys with Predators getting readings.....



Anyone had their rates checked at a dealer? And how much too
please. Or if anyone around my area (Hamilton, Oakville, London)
area that has a Predator or simular device that could be used for a
donation (not borrow) of $20 or so.....

tell your dealer get out their tech 2 and check injector balance rates. Should be no big deal and cost less than one hour shop labor.

Sevice councilor stated about injectors being under valve covers and stuff...........

REALLY got the impression he either didn't know what he was talking
about, or didn't want to start an injector thing. Kinda make it
go away. I don't have any problems that I am aware of yet.
But, wanted to look into.

Sevice councilor stated about injectors being under valve covers and stuff...........
REALLY got the impression he either didn't know what he was talking about.......


<sarcasm> How could that be??!! The folks at the service dept ALWAYS know what they are doing. </sarcasm>

<sarcasm> </sarcasm>
You sure about that syntax? I thought it was
#include <sarcasm.h> http://www.dieselplace.com/forum/smileys/smiley1.gif

Jim

There is a difference between checking the flow rates and the balance rates. The balance rates can be check with a Tech II or a Predator. The flow rates can not.


I'll leave it to someone that has more experiance with this to explain the difference.

Ohhhhhh........



Hopefully someone can explain the dif. Ofcourse I have no clue here.



http://www.dieselplace.com/forum/smileys/smiley5.gif

IIRC there is a detailed diagnostic procedure in the HELMS manual that describes measuring the actual fuel return rate for each injector (not the same as measuring Balance rates with a Tech-II or predator). I seem to remember this is a fairly tedious process that can take several hours (although probably much less than 10 hours for an experienced Tech) Hopefully one of the techs will chime in here.


http://www.dieselplace.com/forum/smileys/smiley23.gifEdited by: jbplock

Return flow rates and balance rates are very different and dont play togather all the time. Balance rates can be checked with a tech-2 and are an indication of cylinder firing condition so to speak. The balance rate is a measurement of how much fuel is being added or taken away from the 'base' pulse.


Flow rate, or return flow on the other hand, is entirely different. Its the amount of fuel the injector does not use and returns back to the tank. On a good running truck, checking the return flow would be very simple. First would be to hook up the graduated cylinders one to each bank. Your looking for ~3mls of flow per injecter per 15 seconds of cranking. That would be~ 12 mls per bank. Of course, some varience may be present with different API readings and fuel temp, but mainly your looking for consistancy. If both banks are returning 16mls, then you would be fine. If one bank is returning 20mls and the other is returning 5mls, then you have an issue. Only at that point would you dissassemble the engine and check each individual injector. Repeating the same process, each injector would be checked against the other 3 in that bank. Flow rates are very unlikly to be high with out some type of symptom, ie. hard start. Balance rates can be high with no symptoms.

Return flow rates and balance rates are very different ....etc...

Most excellent! I like good information.
Thank you dmaxalliTech!!

HBruns

So Flow Rate would be the accurate test for an injector on its way out?



Also, Balance Rate does NOT indicate that there is a problem or not?



Sorry for the stupidity here, but trying to get a grasp here.....http://www.dieselplace.com/forum/smileys/smiley5.gif

Flow rate would be, if there was a problem. If you want them checked to have them checked, flow rate is not a financially smart way of testing them. A quick check of the balance rates is all that can be done easily. Flow rate high, likely you will have a condition present. Balance rate can indicate a problem, but high flow rate(return) will likely not show up on balance rates

Thank you Eric. Much appreciated.

So if the balance rate was out of spec, would it through a code? I requested my dealer to check my balance rates today, they said they saw no codes.

IIRC the balance rates have to reach 15 before a code is set.

IIRC the balance rates have to reach 15 before a code is set. You are correct sirhttp://www.dieselplace.com/forum/smileys/smiley4.gif

But more than 5 is out of spec?



Lets start again.....what is out of spec?

6 in drive


4 in neutral

Thanx. http://www.dieselplace.com/forum/smileys/smiley4.gif