LLY Injector Miss w/ Balance Rates - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY 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 12 (permalink) Old Today, 06:52 AM Thread Starter
 
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LLY Injector Miss w/ Balance Rates

Greetings All, I have a 2005 LLY that I recently purchased and got running, although poorly, it is running. I have an issue that I need help with. I pulled the Balance Rates using my OTC Genysis Evo and it is as follows:
Cyl 1 -1.9
Cyl 2 -1.9
Cyl 3 15.0
Cyl 4 -1.9
Cyl 5 6.0
Cyl 6 15.0
Cyl 7 -1.9
Cyl 8 -1.9
Actual Fuel Rail Pressure 6334.1 psi
Desired FRP 6235.0

I took that data and swapped out some used injectors to see if I could isolate the problem and the balance rates are

Cyl 1 -1.6
Cyl 2 -1.6
Cyl 3 15.0
Cyl 4 5.5
Cyl 5 15.0
Cyl 6 15.0
Cyl 7 -1.6
Cyl 8 -1.6
Actual Fuel Rail Pressure 6465.

Any input would be greatly appreciated.
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post #2 of 12 (permalink) Old Today, 06:56 AM Thread Starter
 
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I also forgot to mention that I have codes PO300C Engine Missfire Detected, Code PO303C Cylinder 3 misfire detected, PO305C Cylinder 5 misfire detected, PO306C Cylinder 6 misfire detected, P1229C Injector 3 Output circuit, and P1238C Injector 6 output circuit as well as P2227C Barometric Sensor Performance. Any Ideas,
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post #3 of 12 (permalink) Old Today, 07:12 AM
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Have you tried running a concentrated dose of injector cleaner?

Bob Anderson
From my Galaxy S9+ using Tapatalk.

From the Texas Panhandle
LLY GMC CC SWB 2500 HD 4x4
Bully Dog intake (existing)
Resonator deleted
EGR deleted
PCV re-routed
MBRP 3" downpipe
FASS LP & filters

PPE Race Fuel Valve
Stock rims with 265/75R16 Cooper S/T Maxx
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post #4 of 12 (permalink) Old Today, 08:31 AM Thread Starter
 
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I have not but will gladly try. Any thing in particular you recommend?
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post #5 of 12 (permalink) Old Today, 09:05 AM
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Quote:
Originally Posted by HankMinion View Post
I have not but will gladly try. Any thing in particular you recommend?
Diesel Kleen is usually available at Walmart and it's good. I've used it but have switched to Hot Shot's Secret. Might try their Diesel Extreme.
The Diesel Kleen jug that does 250 gallons all at once or the entire bottle of Diesel Extreme.
May not fix all the problems. But definitely should help the balance rates.

Bob Anderson
From my Galaxy S9+ using Tapatalk.

From the Texas Panhandle
LLY GMC CC SWB 2500 HD 4x4
Bully Dog intake (existing)
Resonator deleted
EGR deleted
PCV re-routed
MBRP 3" downpipe
FASS LP & filters

PPE Race Fuel Valve
Stock rims with 265/75R16 Cooper S/T Maxx
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post #6 of 12 (permalink) Old Today, 10:14 AM
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Ya certainly looks like dirty/plugged injectors

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Chad
04.5 4x4 ~160k miles
DE 4", 5100s, LBZ MP, S&B LBZ air, KoryWillis Go-go Juice, Insight CTS, ADII, 8' Fisher, Highroller Ultimate Idler Arm, Profab delete, XD RareParts tie rods






Dirtymax this, Dirtymax that... :taunt
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post #7 of 12 (permalink) Old Today, 10:17 AM
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Might try searching "ice pick fix".
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2001 2500HD 4WD EXTENDED CAB LS,
S&B CAI, 4" STAINLESS STEEL EXHAUST, EFI LIVE FROM ATP TRUCKS, EDGE CTS, PPE BOOST VALVE, BANKS INTERCOOLER PIPE, AIR DOG II 165, REBUILT TRANNY WITH SUNCOAST KIT, TRANSGO SHIFTKIT AND BILLIT TORQUE CONVERTER, NEW UPGRADED TAILSHAFT, PUMP RUB FIX ON TRANSFER WITH NEW ALUMINUM TAIL SHAFT, NEW TOW MIRRORS, NEW GAGE HEAVY DUTY FRONT AND REAR BUMPERS, BEANS SUMP, FUMOTO VALVE, RARE PARTS TIE RODS WITH COGNITO PISK, MAD JACK FUEL FILTER ACCESS DOOR, STAINLESS STEEL SPEED BLEEDERS.
2011 GMC 3500HD DUALLY Welding Bed, 4WD CREW CAB, 4" downpipe back exhaust, def delete, egr delete, with new LB7 up pipe, pcv reroute, Fass 150, EFI live with DSP 5, HSP CAI. Air Lift Air bags. PPEI transmission tune.
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post #8 of 12 (permalink) Old Today, 10:19 AM
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Quote:
Originally Posted by mray View Post
Might try searching "ice pick fix".
I agree...those connections may be getting loose and/or weak.

Bob Anderson
From my Galaxy S9+ using Tapatalk.

From the Texas Panhandle
LLY GMC CC SWB 2500 HD 4x4
Bully Dog intake (existing)
Resonator deleted
EGR deleted
PCV re-routed
MBRP 3" downpipe
FASS LP & filters

PPE Race Fuel Valve
Stock rims with 265/75R16 Cooper S/T Maxx
rta1197 is online now  
post #9 of 12 (permalink) Old Today, 10:54 AM
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But if you're swapping injectors and it follows then it's likely the injector

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Chad
04.5 4x4 ~160k miles
DE 4", 5100s, LBZ MP, S&B LBZ air, KoryWillis Go-go Juice, Insight CTS, ADII, 8' Fisher, Highroller Ultimate Idler Arm, Profab delete, XD RareParts tie rods






Dirtymax this, Dirtymax that... :taunt
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post #10 of 12 (permalink) Old Today, 10:59 AM Thread Starter
 
Join Date: Jun 2019
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Thank you all for the replys. I will pick up some injector cleaner this afternoon. I tried the ice pick on the plug ins on the affected plugs and no change. The injectors I swapped were from a running core motor with a bad crank, so I am not sure if they were in fact good. To see no deviation in the ones with the return rates pegged at 15 (cyl 3 and 6) is what had me questioning a circuit problem and etc. I also checked the FICM harness so see if there were any rub areas and they was not any. Thanks again for the quick replys.
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