EFILive DVT injector control

Power Shift

Power Shift

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Apr 22, 2010
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I know this has been talked about before without a definite answer. I am trying to narrow down bad injectors via EFI live. I know I should replace them all but due to extenuating circumstances I can’t really justify doing them all at this time. My question is when I cut injector #7 in the DVT tab of EFI live it is actually controlling Injector (cylinder) #6?

So the chart for isolating injectors is:

DVT tab in Efi live: Inj 1- Inj 2- Inj 3- Inj 4- Inj 5- Inj 6- Inj 7- Inj 8 actually is shutting off

Injector (cylinder): 1 - 2 - 7 - 8 - 4 - 5 - 6 - 3


Is this correct?
 
M

Mike

hmmm....
Feb 17, 2007
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San Angelo, TX
Power Shift said:
I know this has been talked about before without a definite answer. I am trying to narrow down bad injectors via EFI live. I know I should replace them all but due to extenuating circumstances I can’t really justify doing them all at this time. My question is when I cut injector #7 in the DVT tab of EFI live it is actually controlling Injector (cylinder) #6?

So the chart for isolating injectors is:

DVT tab in Efi live: Inj 1- Inj 2- Inj 3- Inj 4- Inj 5- Inj 6- Inj 7- Inj 8 actually is shutting off

Injector (cylinder): 1 - 2 - 7 - 8 - 4 - 5 - 6 - 3


Is this correct?
Click to expand...

Oops, didn't see the color scheme. That was not the case for me. killing injector 6 killed firing order injector 6. All others were number for location also. However, an easy time consuming check may be in order to confirm for yourself.

For me, an 01 along with an 03, I have found the DVT for those two to be right. I was able to confirm this before injector removal by tapping the wires to the injectors at the connectors at the valve covers. I used a dmm meter which is able to check pulse width. Killed injector with DVT and checked that injector in location. Good luck, I know it can be nerve-racking not knowing for sure. Easier to go through the checks than changing the lb7 injectors.
 
Chevy1925

Chevy1925

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if your still unsure. jsut shut the injector down that you think is the right one, leave it running and grab a spray bottle with water in it. Spray each exahsut port on the exhaust manifold til you find the one the water doesnt instantly evaporate off (you will know what i mean when you do it). easiest way ive found for me to find missing cylinders on gassers and my truck :D
 
M

Mike

hmmm....
Feb 17, 2007
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San Angelo, TX
Chevy1925 said:
if your still unsure. jsut shut the injector down that you think is the right one, leave it running and grab a spray bottle with water in it. Spray each exahsut port on the exhaust manifold til you find the one the water doesnt instantly evaporate off (you will know what i mean when you do it). easiest way ive found for me to find missing cylinders on gassers and my truck :D
Click to expand...

Gasser EGT's are high enough at idle to instantly evaporate sprayed water. That approach on a diesel is hard because they don't idle with enough egt temps to evaporate that spray. :eek: With water, it's still a guess for me. Do you have stock manifolds? I've used an IR heat gun and still find that inconclusive. I must suck at reasoning. lol
 
Chevy1925

Chevy1925

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Mike said:
Gasser EGT's are high enough at idle to instantly evaporate sprayed water. That approach on a diesel is hard because they don't idle with enough egt temps to evaporate that spray. :eek: With water, it's still a guess for me. Do you have stock manifolds? I've used an IR heat gun and still find that inconclusive. I must suck at reasoning. lol
Click to expand...

:confused: really? ive yet to have that way fail for me on the diesels ive worked on. mostly 7.3s and 6.0s and my truck. this is with the truck at operating temp of course. hasnt failed me yet
 
Power Shift

Power Shift

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Apr 22, 2010
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Utah
Mike said:
Oops, didn't see the color scheme. That was not the case for me. killing injector 6 killed firing order injector 6. All others were number for location also. However, an easy time consuming check may be in order to confirm for yourself.

For me, an 01 along with an 03, I have found the DVT for those two to be right. I was able to confirm this before injector removal by tapping the wires to the injectors at the connectors at the valve covers. I used a dmm meter which is able to check pulse width. Killed injector with DVT and checked that injector in location. Good luck, I know it can be nerve-racking not knowing for sure. Easier to go through the checks than changing the lb7 injectors.
Click to expand...

Just to make sure i am understanding this correctly, killing injector 6 in the DVT tab actually killed injector six?

Chevy1925 said:
if your still unsure. jsut shut the injector down that you think is the right one, leave it running and grab a spray bottle with water in it. Spray each exahsut port on the exhaust manifold til you find the one the water doesnt instantly evaporate off (you will know what i mean when you do it). easiest way ive found for me to find missing cylinders on gassers and my truck :D
Click to expand...

That seems like a darn good idea. Thank you :hug:

S Phinney said:
On the lb7 the one you turned off is the exact cylinder number. Drivers bank 2-4-6-8 and passengers bank 1-3-5-7.
Click to expand...

Hmmm, i read of ben's problem with the DVT tab but i now assume that is just for non- LB7s?

I just wanna to be sure before i get tearing it down, don't really wanna do it twice too bad :baby:
 
M

Mike

hmmm....
Feb 17, 2007
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San Angelo, TX
Chevy1925 said:
:confused: really? ive yet to have that way fail for me on the diesels ive worked on. mostly 7.3s and 6.0s and my truck. this is with the truck at operating temp of course. hasnt failed me yet
Click to expand...

I'm not saying you are not right. I'm only saying at operating temps, when water is sprayed, even after killing the cylinder, ports are close, hot and therefor will heat the dead cylinder to a point. idling, port temps on an lb7 may not reach 212 degrees. So, re-heat could take a while even if the ports were cool to start with and once started then killed - while checking temps as heated - at idle, for a conclusive effected cylinder.


Spraying a heated port with stock manifolds would be tough to insure rejection from surrounding ports. I was just saying reading a zero on a meter is a for-sure-thing. No argument though.
 
Chevy1925

Chevy1925

don't know sh!t about IFS
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Mike said:
I'm not saying you are not right. I'm only saying at operating temps, when water is sprayed, even after killing the cylinder, ports are close, hot and therefor will heat the dead cylinder to a point. idling, port temps on an lb7 may not reach 212 degrees. So, re-heat could take a while even if the ports were cool to start with and once started then killed - while checking temps as heated - at idle, for a conclusive effected cylinder.


Spraying a heated port with stock manifolds would be tough to insure rejection from surrounding ports. I was just saying reading a zero on a meter is a for-sure-thing. No argument though.
Click to expand...

sounds good man. I jsut know it aint let me down yet :hug:
 
LBZ

LBZ

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Sledhead said:
Quoted from this thread which has been ongoing for 3 months: http://duramaxdiesels.com/forum/showthread.php?t=27243

I'm disappointed that it still seems to be unresolved by EFI Live.
Click to expand...

IMO EFI should be doing the testing themselves not relying on third party info so they can make changes in their software. What if the info is wrong or test procedures fouled up?

It should be the other way around-us testing their changes anyhow.
 
DIESELMAFIAPER.LB7

DIESELMAFIAPER.LB7

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S Phinney said:
On the lb7 the one you turned off is the exact cylinder number. Drivers bank 2-4-6-8 and passengers bank 1-3-5-7.
Click to expand...

this is correct i used it this way then pull injectors an all is well done this with a dozen lb7 injectors hasnt been wrong so far for me so if it says 7 is bad go to 7 cylinder also i have done this with lly-up engines an it has worked for me to so not sure what problems everyone else is having
 
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