Duramax Diesels Forum Truck of the Week
  #1  
Old 09-19-2011, 05:40 AM
williambryan williambryan is offline
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Default Injector Balance Rates

Balance rates are as follows: 1.3, .5, 2.4, .3, 2.5, 1.2, 4.5, and 1.5. Tested by GM dealership. Truck has always had filters changed and 20% of fuel has had additive..........does not smoke, make oil and gets an honest 18.5 mpg at 62 mph. Engine has 160000 miles. Does this test confirm that the injectors are bad? They also said the fuel pressure reg is failing.

I didn't realize what the dealer had written there are some minus's they are as follows: 1.3, .5, 2.4, -3, 2.5, 1.2, -4.5, -1.5 PLEASE PROVIDE SOME MORE COMMENTS REGARDING IF I NEED TO CHANGE THE INJECTORS. THANKS

Last edited by williambryan; 09-19-2011 at 08:01 AM. Reason: Incorrect info
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  #2  
Old 09-19-2011, 06:20 AM
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coker6303 coker6303 is offline
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The 4.5 is on its way but i don't think you should change anything yet.

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  #3  
Old 09-19-2011, 06:44 AM
williambryan williambryan is offline
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Default Balance rate

Just what does the balance rate mean and what is good? You mentioned 4.5 is on it way out ..............I thought this was probably the good one
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Old 09-19-2011, 07:05 AM
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coker6303 coker6303 is offline
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+/- 4.0 is what you are looking for according to gm. Your 4.5 is just out of spec, but not way out like some have been.

Hopefully someone else will chime in.

What symtoms are you having since you are worried about balance rates?

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Russ

2008 LMM CC/SB 4x4
JoshH -Top Notch Garage tunes, Relentless Diesel trans
Lowered T bars & 3" drop shackles on 305/50r20's
554hp 1014ft-lbs 12.74 @ 104 on stock turbo/fuel
cast S366/batmo S480 twins 40% overs dual CP3
11.85 @ 113mph

Thank you to JoshH, emiller3, and blksmokelb7
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  #5  
Old 09-19-2011, 07:24 AM
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fast03 fast03 is offline
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It could go a long time with a 4.5 in park. Keep driving it.
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  #6  
Old 09-19-2011, 08:03 AM
williambryan williambryan is offline
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Quote:
Originally Posted by williambryan View Post
Balance rates are as follows: 1.3, .5, 2.4, .3, 2.5, 1.2, 4.5, and 1.5. Tested by GM dealership. Truck has always had filters changed and 20% of fuel has had additive..........does not smoke, make oil and gets an honest 18.5 mpg at 62 mph. Engine has 160000 miles. Does this test confirm that the injectors are bad? They also said the fuel pressure reg is failing.

I didn't realize what the dealer had written there are some minus's they are as follows: 1.3, .5, 2.4, -3, 2.5, 1.2, -4.5, -1.5 PLEASE PROVIDE SOME MORE COMMENTS REGARDING IF I NEED TO CHANGE THE INJECTORS. THANKS
...
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Old 09-19-2011, 08:08 AM
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coker6303 coker6303 is offline
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Relax! Keep driving it, you don't have anything to worry about yet.

What year truck is this on? 160K and injectors look that good, i'm guessing it's an LBZ.

As far as the FPR failing, you still need to tell us why you are worried about any of this. What symtoms are you having? Something wrong? What triggered you to start checking these things out?
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Russ

2008 LMM CC/SB 4x4
JoshH -Top Notch Garage tunes, Relentless Diesel trans
Lowered T bars & 3" drop shackles on 305/50r20's
554hp 1014ft-lbs 12.74 @ 104 on stock turbo/fuel
cast S366/batmo S480 twins 40% overs dual CP3
11.85 @ 113mph

Thank you to JoshH, emiller3, and blksmokelb7
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Old 09-19-2011, 08:10 AM
williambryan williambryan is offline
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Cool Updated balance rate

Quote:
Originally Posted by coker6303 View Post
+/- 4.0 is what you are looking for according to gm. Your 4.5 is just out of spec, but not way out like some have been.

Hopefully someone else will chime in.

What symtoms are you having since you are worried about balance rates?

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i have 160000 miles on them and want to know if they need changed as the dealer advised. Also, noticed the dealer's documention on scrap paper has some minus on some of the numbers. 1.3, .5, 2.4, -3, 2.5, 1.2, -4.5, -1.5 please advise on these different numbers thanks
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Old 09-19-2011, 08:19 AM
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coker6303 coker6303 is offline
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If they are offering to change them at no cost to you then go for it. If they are suggesting you change them and it will cost you out of pocket then you are crazy to do so.

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Russ

2008 LMM CC/SB 4x4
JoshH -Top Notch Garage tunes, Relentless Diesel trans
Lowered T bars & 3" drop shackles on 305/50r20's
554hp 1014ft-lbs 12.74 @ 104 on stock turbo/fuel
cast S366/batmo S480 twins 40% overs dual CP3
11.85 @ 113mph

Thank you to JoshH, emiller3, and blksmokelb7
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  #10  
Old 09-19-2011, 08:25 AM
williambryan williambryan is offline
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Default Balance rate

Quote:
Originally Posted by coker6303 View Post
relax! Keep driving it, you don't have anything to worry about yet.

What year truck is this on? 160k and injectors look that good, i'm guessing it's an lbz.

As far as the fpr failing, you still need to tell us why you are worried about any of this. What symtoms are you having? Something wrong? What triggered you to start checking these things out?
i am retired and once a year i go on a long trip with my camper and worried that the injectors will go out on a trip leaving me at the mercy of a dealership. I have 3 friends with same model truck that had to change injectors at less than 130k, i am a retired acft mech and although diesel is not my strong point i have the ability to change them myself. I am the original owner can't afford a new one and want to keep it dependable. Year is 2003 DOESN'T SMOKE, DOESN'T MAKE OIL, RUNS SMOOTH, GETS 18.5 MPG AT 62 MPH

Last edited by williambryan; 09-19-2011 at 08:27 AM. Reason: ADDITIONAL INFORMATION
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  #11  
Old 09-19-2011, 08:35 AM
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Burn Down Burn Down is online now
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If your worried about them, then do it. 160k on LB7 injectors is good... You have one that is borderline & could stay that way along time or crap out tomorrow. So it's your call.
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  #12  
Old 09-25-2011, 04:47 PM
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can you test injectors with a ppe excelerator?
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  #13  
Old 09-25-2011, 05:46 PM
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yes you can test balance rates with an xcelerator. when you get to the main menu on the programmer it should say data scanning as an option. once you select data scanning you should start the engine and it will start showing you real time data. Use the down arrow button to scroll through the options. it gives you real time data on alot of things.
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