Injectors lb7 - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 17 (permalink) Old 01-02-2013, 09:23 AM Thread Starter
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Injectors lb7

So I have the edge monitor for my lly Duramax and my friend wants me to do injectors on his lb7 because its blowing blueish white smoke. So I connected my edge to his truck and the injectors showed a +6 and a -6. Does this mean all the injectors are shot? Is there something else wrong? I know on my lly the injector rate is around +1 -1. He thinks that this chip shows what the computer thinks it should be putting out. What exactly does this monitor injection rate tell you. If their bad? Because on my lly two injectors were shooting a rate of +8 after I put the new injectors in and I can't find out why I was told do a compression test

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post #2 of 17 (permalink) Old 01-02-2013, 09:50 AM
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The injectors on an lb7 are going to be far more complicated as you have to pull the valve covers off so people will replace a side at a time to keep from having to pull the covers off a second time. Balance rates should be read at operating temperature on a stock tune. I read your other thread with your oil covered injector and to the best of my knowledge if you have a loss of compression aka a hole or crack in a piston the truck will compensate for the lack of power from that cylinder by adding fuel. Thus your positive rate of +8.


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post #3 of 17 (permalink) Old 01-02-2013, 10:18 AM
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Doesnt +8 mean its retarding the fuel, not adding?

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post #4 of 17 (permalink) Old 01-02-2013, 10:36 AM
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I was thinking it meant it was adding.


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post #5 of 17 (permalink) Old 01-02-2013, 07:00 PM
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Anything +4 or -4 in park up to operating temp is within spec. +6 and -6 are out of spec. I would recommend replacing all eight of the injectors. Another indication that it's injectors is if it's blowing white smoke and has a raw fuel smell.

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post #6 of 17 (permalink) Old 01-02-2013, 07:07 PM
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Quote:
Originally Posted by nikokrzynowek View Post
So I have the edge monitor for my lly Duramax and my friend wants me to do injectors on his lb7 because its blowing blueish white smoke. So I connected my edge to his truck and the injectors showed a +6 and a -6. Does this mean all the injectors are shot? Is there something else wrong? I know on my lly the injector rate is around +1 -1. He thinks that this chip shows what the computer thinks it should be putting out. What exactly does this monitor injection rate tell you. If their bad? Because on my lly two injectors were shooting a rate of +8 after I put the new injectors in and I can't find out why I was told do a compression test
Because if an injector adds tons of fuel, you have a problem in the cylinder...with compression. Add in the fact you had oil all over it leads me to believe you need to pull the heads and have a look...compression test will tell you for sure if there is a problem with the cylinder in question.

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post #7 of 17 (permalink) Old 01-06-2013, 08:02 PM Thread Starter
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Well as far as the lb7 goes we ripped the valve covers off and sending all 8 out to get tested hopefully have that done tomorrow. You think the best bet is to get a full valve cover gasket set with all 4 gaskets?? And as far as my own lly ill have it back Tuesday or wensday and the 8 inch lift will be on so ill be able to do the compression test and find out if there's something wrong with that. What tells the injectors to fire do you think it could be something with wiring. Started the truck up from sitting at te shop for a few days In the freezing cold and it was looping

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post #8 of 17 (permalink) Old 01-06-2013, 08:07 PM
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The rubber gaskets can be reused if they dont seem to be cracked or compromised in any way. The upper covers just have gray silicone, so I'd get a tube of that and call it a day!

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post #9 of 17 (permalink) Old 01-11-2013, 07:23 PM
 
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Can someone please help me new to the duramax....i have a 2003 gmc 6.6 duramax..oil pan full of diesel ...injectors check out ok ...what know.......
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post #10 of 17 (permalink) Old 01-11-2013, 07:26 PM
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Quote:
Originally Posted by texas10pt View Post
Can someone please help me new to the duramax....i have a 2003 gmc 6.6 duramax..oil pan full of diesel ...injectors check out ok ...what know.......
your injectors are bad...balance rates dont tell the whole story

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