Injectors lb7

nikokrzynowek · 01-02-2013, 08:23 AM

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

jpbrienp · 01-02-2013, 08:50 AM

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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boostnlb7 · 01-02-2013, 09:18 AM

Doesnt +8 mean its retarding the fuel, not adding?

jpbrienp · 01-02-2013, 09:36 AM

I was thinking it meant it was adding.

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**Brent@LDS** · 01-02-2013, 06:00 PM

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.

Thebiggids · 01-02-2013, 06:07 PM

Quote:

Originally Posted by nikokrzynowek

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.

nikokrzynowek · 01-06-2013, 07:02 PM

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

**01 D_Max** · 01-06-2013, 07:07 PM

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!

texas10pt · 01-11-2013, 06:23 PM

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.......

Thebiggids · 01-11-2013, 06:26 PM

Quote:

Originally Posted by texas10pt

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

01-02-2013, 08:23 AM	eBay Motors #1 (permalink)
nikokrzynowek Junior Member Join Date: Jun 2012 Location: Connecticut Posts: 109	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 __________________ 04.5 Duramax LLY Extended cab long bed Fully loaded 124hp Banks six gun w/speed loader MBRP 4" Straight pipe 20% tints, 8 inch fabtech suspension lift, 18" Motto metal rims with 37" Micky Thompson ATZ

01-02-2013, 08:50 AM	eBay Motors #2 (permalink)
jpbrienp Senior Member Join Date: Sep 2011 Location: Gso nc Posts: 309	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. Sent from my iPhone using AutoGuide.com App __________________ 2005 rclb, edge insight, dsp5 from Idaho rob, 4in straight pipe, 3in down pipe, afe blade runner, S&B intake, pcv reroute, and erg blocked.

01-02-2013, 09:18 AM	eBay Motors #3 (permalink)
boostnlb7 DuramaxForum Veteran Join Date: Nov 2012 Location: in the woods of michigan Posts: 1,113	Doesnt +8 mean its retarding the fuel, not adding? __________________ couldnt pass hazing to be a "pup bro" 03 lb7 ccsb 4x4-6" bds- 20"mkw's- p195/65/14 intercos- auto meter boost/pyro/trans gauges- traction bars- 5'' DE straight pipe- PPE BIV- AD II 200 lift pump- edge insight CTS- spectre CAI- 45% over injectors- LMM cp3 & FPR -EFI live dsp5 flashed by tony burkhard with danville tunes- thanks to Brent @ Lincoln Diesel

01-02-2013, 09:36 AM	eBay Motors #4 (permalink)
jpbrienp Senior Member Join Date: Sep 2011 Location: Gso nc Posts: 309	I was thinking it meant it was adding. Sent from my iPhone using AutoGuide.com App __________________ 2005 rclb, edge insight, dsp5 from Idaho rob, 4in straight pipe, 3in down pipe, afe blade runner, S&B intake, pcv reroute, and erg blocked.

01-02-2013, 06:00 PM	eBay Motors #5 (permalink)
Brent@LDS DF Sponsors Join Date: Aug 2009 Posts: 396	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. __________________ *Looking for LB7 Injectors?* Check these prices out!.... ......... Lincoln Diesel Specialties ......... Phone: 920-765-1615 Click here For, LB7 Injector Install Instructions

01-06-2013, 07:02 PM	eBay Motors #7 (permalink)
nikokrzynowek Junior Member Join Date: Jun 2012 Location: Connecticut Posts: 109	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 __________________ 04.5 Duramax LLY Extended cab long bed Fully loaded 124hp Banks six gun w/speed loader MBRP 4" Straight pipe 20% tints, 8 inch fabtech suspension lift, 18" Motto metal rims with 37" Micky Thompson ATZ

01-06-2013, 07:07 PM	eBay Motors #8 (permalink)
01 D_Max Offical LB7 "Tech" Join Date: Sep 2010 Location: Saint Johnsville, NY Posts: 3,954	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! __________________ -Aaron- 2001 GMC Sierra 2500HD, Limited Edition, CC,SB EFI Live V2 w/dsp5 MAX EFFORT by Idaho Rob, EGT's Never higher than 1150* Cognito Braces, and ATP Sleeves, BD Manifold, ARP H.Studs, BATMO, M.P. mod, MA Aluminum Bleeder, PPE Boost Valve, Banks Ram Air- Intercooler- Wastegate, FASS 150, LBZ FPR, Shimmed FPRV, Built Trans, 4" MBRP turbo back exhaust w/6"tip, Corsa Muffler @180,000-New injectors from Lincoln Diesel, CAT Adapter/filter/spacer Air Lift, Bilstein Shocks, Leveling Kit, Recon LED tail lights & over cab lights, 20" Forged Aluminum WELD Racing Rims, 295/55/20 Nitto Trail Grappler Tires, MANY More extras inside...

01-11-2013, 06:23 PM	eBay Motors #9 (permalink)
texas10pt Join Date: Jan 2013 Posts: 6	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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