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Old 09-09-2019, 03:22 PM   #1 (permalink)
Petr51488
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What will I notice with new injectors?

I have an 08 lmm with 213k miles. Original injectors and cp3 pump. I get the usual p0087 code whenever towing a load. I have a lift pump- other than that itís all stock. Iím going to get my injectors replaced to try and fix the problem. Truck really lacks on power. Black smoke when I stomp it on the highway and smoke / haze when I floor it on a highway as well. What will I notice when I get the new injectors? Will it feel like a new truck again?

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Old 09-09-2019, 04:18 PM   #2 (permalink)
Ron Nielson
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What have you tested to determine you need new injectors?

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Old 09-09-2019, 04:20 PM   #3 (permalink)
smore79
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Do you have anything to diagnose the truck?
Balance rates?
Desire vs Actual fuel pressure - this will tell you a lot.
It may not actually be your injectors
Have you done the bottle test?
Could be something as simple as the FPRV or the FPR rather than injector
Do a bit of troubleshooting and it could save you some coin
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EFI Live DSP5 Spade | 68mm Billet Cheetah
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Old 09-09-2019, 04:28 PM   #4 (permalink)
smore79
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I'm willing to bet it's your FPRV considering everything you said above.
You can try these 3 easy thing to fix it:
Replace it
Shim it
Install a race valve

Or do a bottle test which is free and will tell you before you start replacing stuff.
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2005 Chevy Duramax LLY
10-12" Bullet Proof Lift - 8" Deavers
24x14 American Force Independence - 38" Nitto's
EFI Live DSP5 Spade | 68mm Billet Cheetah
FASS Platiunum 150 | Suncoast G-Max 5 w/ 1056
5" Straight Exhaust Diamond Eye Downpipe
EGR Blocked | S&B LBZ Intake & Mouthpiece
RedHead Steering Box | Amp Steps....Lots of other stuff

2016 GMC Denali HD LML
CCSB 4x4
Stealth Module

USN 2002-2008
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Old 09-09-2019, 04:43 PM   #5 (permalink)
Petr51488
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I changed the fuel pressure relief valve with a racing one ( no spring) . I’ve changed the whole fuel filter housing. Replaced all the rubber fuel lines that were collapsing. Put in a lift pump. I think that’s it? I have not checked the balance rates yet but I will have them checked and report back. I’ve been chasing this problem for years. For the most part if I keep it in 5th gear and don’t let the truck “lug” the check engine light and replace fuel filter light won’t turn on. But the truck also lacks in power. I used to make a 1.5 hour trip up some steep grades with a 15k trailer and wouldn’t drop a gear. Now if I don’t put it in 5th- codes pop up.
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Old 09-09-2019, 08:30 PM   #6 (permalink)
LBZjunkie
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Balance rates will not show return rates. From what you describe, injectors, towing, lugging in 6th, even tho it pulls it. The biggest thing I notice with new injectors is starting, just seems to fire up so much faster, less smoke, quieter, and no P0087 when towing hot and heavy.
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Old 09-09-2019, 08:40 PM   #7 (permalink)
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Quote:
Originally Posted by LBZjunkie View Post
Balance rates will not show return rates. From what you describe, injectors, towing, lugging in 6th, even tho it pulls it. The biggest thing I notice with new injectors is starting, just seems to fire up so much faster, less smoke, quieter, and no P0087 when towing hot and heavy.
All things I want lol. My truck starts fine. Funny thing it cranked very weak- replaced the batteries- ends up being the starter was the problem. Less smoke is good- and no p0087 is on everyone’s wish list . I also noticed my truck gets hotter much faster and hotter too when towing. Big swings in temps when towing
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1998 Chevy 1500 Reg Cab Long Bed 5.7
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Old 09-09-2019, 09:18 PM   #8 (permalink)
LBZjunkie
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You shouldn't get over the 210 mark, pull the radiator and pressure wash everything. We just got back from a 6,100 mile trip through Colorado, Wyoming, never over 210 on our LBZ yours should do the same. Some pretty good pulls through Colorado too.
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2006 CCSB 2WD LBZ
Exhaust brake, by GM
Kennedy lift pump, single
Primary/secondary fuel filter's, OE still in place
Firestone air bags
Pacbrake onboard air
EGR delete
Junk *** POS Duramileage tuner-WTF WAS I THINKING!
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Old 09-10-2019, 04:01 PM   #9 (permalink)
smore79
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Quote:
Originally Posted by LBZjunkie View Post
Balance rates will not show return rates. From what you describe, injectors, towing, lugging in 6th, even tho it pulls it. The biggest thing I notice with new injectors is starting, just seems to fire up so much faster, less smoke, quieter, and no P0087 when towing hot and heavy.
Right - they won't give return rates, never said they would. why I kept saying to do the bottle test. But he mentioned he put in the race valve so you can rule out the FPRV most likely.

Balance rates will still steer him in the right direction for bad injectors.
Have you taken all the emissions equipment of the truck? If so, can you smell raw fuel, or does the exhaust have a white haze while at idle?
When you read your balance rates, let us know what the fuel rail pressure is doing at WOT - Desired vs Actual.
__________________
2005 Chevy Duramax LLY
10-12" Bullet Proof Lift - 8" Deavers
24x14 American Force Independence - 38" Nitto's
EFI Live DSP5 Spade | 68mm Billet Cheetah
FASS Platiunum 150 | Suncoast G-Max 5 w/ 1056
5" Straight Exhaust Diamond Eye Downpipe
EGR Blocked | S&B LBZ Intake & Mouthpiece
RedHead Steering Box | Amp Steps....Lots of other stuff

2016 GMC Denali HD LML
CCSB 4x4
Stealth Module

USN 2002-2008
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Old Yesterday, 09:53 PM   #10 (permalink)
Petr51488
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Quote:
Originally Posted by smore79 View Post
Quote:
Originally Posted by LBZjunkie View Post
Balance rates will not show return rates. From what you describe, injectors, towing, lugging in 6th, even tho it pulls it. The biggest thing I notice with new injectors is starting, just seems to fire up so much faster, less smoke, quieter, and no P0087 when towing hot and heavy.
Right - they won't give return rates, never said they would. why I kept saying to do the bottle test. But he mentioned he put in the race valve so you can rule out the FPRV most likely.

Balance rates will still steer him in the right direction for bad injectors.
Have you taken all the emissions equipment of the truck? If so, can you smell raw fuel, or does the exhaust have a white haze while at idle?
When you read your balance rates, let us know what the fuel rail pressure is doing at WOT - Desired vs Actual.
All emissions equipment is on the truck. All stock

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2008 GMC 2500hd SLT CC LB Fire Red D/A w/Boss 8'6 Super Duty Plow
2008 GMC 2500hd WT Reg Cab Long Bed 6.0
1998 Chevy 1500 Reg Cab Long Bed 5.7
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