Pp172 & p-174 ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

solidaxel · 02-11-2014, 02:23 PM

Where to start to look for a lean code correction, 2003 5.3?

68GMCCustom · 02-11-2014, 08:25 PM

clogged injectors?

BR3W CITY · 02-11-2014, 09:09 PM

Wait one is a lean code the other is rich?

Check your 02's, check that the maf isn't dirty, clear the codes, see if they come back. Clogged injectors can be a lean code cause, a stuck-open injector can cause rich. Did you clean the injectors before installing, or ever run an injector cleaner through the system?

You haven't provided much to work with homie.. Lets get some more info.

solidaxel · 02-12-2014, 09:56 AM

Well sorry !!

I did some homework and with these comments I have some areas to look at.

The injectors were cleaned and flowed at 79 ML. the tank, lines, pump, filter, regulator, are all new.

The two rails were cleaned, and the fuel pressure is at 55#. the MAF has been cleaned with MAS cleaner and the filter and connections are new and tight.

I did find a vacuum leak at the dip stick tube, which is where I found the oil leak!

When changing ex. manifolds from truck to TBSS I was not able to get the tube to fully installed in the block, so I ordered a new TBSS tube, will know today!
And two new O2 sensors from the same folks that did the wiring and re programed the computer Howell Engine Development

O K, what next ?

**Hart_Rod** · 02-12-2014, 11:33 AM

You really need to log you LTFTs and your STFTs (long and short term fuel trims). This will give you a better idea of where the problem is (left or right side) and how bad the problem is. You said Howell did your tune. They can get you close, but it really needs to be data logged and at least road tuned to make sure your airflow (MAF) is calibrated correctly. 95% of tune is based on the MAF calibration being correct..... I would also try clearing the code and then driving it some more. If the code were set, but then you fixed the problem (vacuum leak at dipstick), it doesn't clear immediately unless you clear it yourself. Just my .02$. Send me your tune and I will take a look at it.

68GMCCustom · 02-13-2014, 11:37 AM

Quote:

Originally Posted by Hart_Rod

You really need to log you LTFTs and your STFTs (long and short term fuel trims). This will give you a better idea of where the problem is (left or right side) and how bad the problem is. You said Howell did your tune. They can get you close, but it really needs to be data logged and at least road tuned to make sure your airflow (MAF) is calibrated correctly. 95% of tune is based on the MAF calibration being correct..... I would also try clearing the code and then driving it some more. If the code were set, but then you fixed the problem (vacuum leak at dipstick), it doesn't clear immediately unless you clear it yourself. Just my .02$. Send me your tune and I will take a look at it.

Dang Rob! A few months (weeks?) with HPT and he's talking fuel trims, MAF cal's and offering to look at tunes!

just ribbing you!

**Hart_Rod** · 02-13-2014, 11:53 AM

Quote:

Originally Posted by 68GMCCustom

Dang Rob! A few months (weeks?) with HPT and he's talking fuel trims, MAF cal's and offering to look at tunes!

just ribbing you!

, I spent a week in a Holiday in Express,

.

BR3W CITY · 02-12-2014, 07:26 PM

Does it run different with the MAF unplugged, or the vac line @ FPR unplugged?

solidaxel · 02-13-2014, 11:10 PM

Quote:

Originally Posted by BR3W CITY

Does it run different with the MAF unplugged, or the vac line @ FPR unplugged?

O K, I did notice there was a "bit" of rufness in the idle when there were both were unplugged, hooked them back up and it smothed out...........now I am going to the Holiday Inn Express!

68GMCCustom · 02-13-2014, 04:55 PM

LMAO!

Help you with those injector specs any?

02-11-2014, 02:23 PM	#1
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Pp172 & p-174 ?? Where to start to look for a lean code correction, 2003 5.3? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

02-11-2014, 08:25 PM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Pp172 & p-174 ?? clogged injectors? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

02-11-2014, 09:09 PM	#3
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Pp172 & p-174 ?? Wait one is a lean code the other is rich? Check your 02's, check that the maf isn't dirty, clear the codes, see if they come back. Clogged injectors can be a lean code cause, a stuck-open injector can cause rich. Did you clean the injectors before installing, or ever run an injector cleaner through the system? You haven't provided much to work with homie.. Lets get some more info. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-12-2014, 09:56 AM	#4
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: Pp172 & p-174 ?? Well sorry !! I did some homework and with these comments I have some areas to look at. The injectors were cleaned and flowed at 79 ML. the tank, lines, pump, filter, regulator, are all new. The two rails were cleaned, and the fuel pressure is at 55#. the MAF has been cleaned with MAS cleaner and the filter and connections are new and tight. I did find a vacuum leak at the dip stick tube, which is where I found the oil leak! When changing ex. manifolds from truck to TBSS I was not able to get the tube to fully installed in the block, so I ordered a new TBSS tube, will know today! And two new O2 sensors from the same folks that did the wiring and re programed the computer Howell Engine Development O K, what next ? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

02-12-2014, 11:33 AM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Pp172 & p-174 ?? You really need to log you LTFTs and your STFTs (long and short term fuel trims). This will give you a better idea of where the problem is (left or right side) and how bad the problem is. You said Howell did your tune. They can get you close, but it really needs to be data logged and at least road tuned to make sure your airflow (MAF) is calibrated correctly. 95% of tune is based on the MAF calibration being correct..... I would also try clearing the code and then driving it some more. If the code were set, but then you fixed the problem (vacuum leak at dipstick), it doesn't clear immediately unless you clear it yourself. Just my .02$. Send me your tune and I will take a look at it. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

02-12-2014, 07:26 PM	#8
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Pp172 & p-174 ?? Does it run different with the MAF unplugged, or the vac line @ FPR unplugged? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-13-2014, 04:55 PM	#10
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Pp172 & p-174 ?? LMAO! Help you with those injector specs any? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken



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