Got a few codes i need help fixing guys :D

Maverick530 · February 26th, 2011, 05:36 PM

okay well i scanned my car and got these codes

p0171 too lean bank 1
p0174
p0305 cylinder 5 missfire

and i think this is effecting some gas mileage so i want to fix this asap
anyone know what to do?

cliffyk · February 26th, 2011, 06:55 PM

Possible causes and diagnostic aids here...

bottled2v · February 26th, 2011, 07:06 PM

fix the misfire code fist as that can cause other codes. i'd bet it's a coil going out, swap the number 5 and number 6 coils and see if the miss moves to cylinder 6. if so replace the coil.

Maverick530 · February 27th, 2011, 03:57 AM

it might move to six?
right now i put some seafoam into my tank first to see if its just a dirty injector but were do i get coil packs, i can only find like 8 together

bottled2v · February 27th, 2011, 12:40 PM

you can buy them individually at a ford dealer or pretty much any parts store like autozone, oreily's, etc. any place should have a couple in stock.

what i meant by "move to 6" is that if the misfire on cylinder 5 is due to the coil, and you swap the coils between cylinder 5 and 6 so that the "bad" coil is on cylinder 6 now, then your misfire code will move to cylinder 6.

Maverick530 · February 27th, 2011, 02:58 PM

Originally Posted by bottled2v

you can buy them individually at a ford dealer or pretty much any parts store like autozone, oreily's, etc. any place should have a couple in stock.

what i meant by "move to 6" is that if the misfire on cylinder 5 is due to the coil, and you swap the coils between cylinder 5 and 6 so that the "bad" coil is on cylinder 6 now, then your misfire code will move to cylinder 6.

oh okay. gotcha, i was in problem mode not problem solving mode, so i was thinking it might get worse lol

cliffyk · February 27th, 2011, 03:24 PM

Keep in mind also that misfire does not immediately mean an ignition problem. The misfire monitor measures and compares the rotational velocity and acceleration of the crank--that's all. It doesn't know whether it'a an ignition, fueling, or compression issue; just that the crank rotation wasn't right.

More about the misfire monitor here...

03SonicBoom · February 27th, 2011, 03:33 PM

Originally Posted by cliffyk

Keep in mind also that misfire does not immediately mean an ignition problem. The misfire monitor measures and compares the rotational velocity and acceleration of the crank--that's all. It doesn't know whether it'a an ignition, fueling, or compression issue; just that the crank rotation wasn't right.

More about the misfire monitor here...

This. You first need to determine if it's fuel, spark, or compression (hopefully not compression). Sway plugs and/or COP to eliminate or determine spark.

bottled2v · February 27th, 2011, 03:37 PM

^ totally agree with the above 2 posts. swapping coils is easy, it'll rule out that as a possibility or it'll confirm it as the problem, and coils going bad is the more common problem rather than a bad injector or burnt valve or something of that sort.

Maverick530 · February 27th, 2011, 03:52 PM

well i have another engine a few miles away that i forgot about, and ill take the coils off of that one, and some fuel injectors and what ever i need i guess

86er · February 27th, 2011, 04:03 PM

how many miles are on your car? Do you have the cats? I had those codes and one other on an aviator, compression was good, new coil and a new plug, Still missing. Ended up being a clogged cat.

Im not saying thats the problem, just make sure you take it step by step and not over look anything

Maverick530 · February 27th, 2011, 11:34 PM

i have a catted x pipe, and have around 95 thousand, i have all my cats, but as for the coil pack its going to be free, because of my extra motor, and if need be i can get a new fuel injector. right now im just put a bottle of sea foam into my tank and its running a lot better but im sure i still have the miss fire

Shaun03GT · February 28th, 2011, 12:24 AM

Could be the fuel rail pressure sensor. When mine went, I had 2 codes that popped up saying Lean in Bank 1 & 2. Can you view live data? using a scan tool or something?

Maverick530 · February 28th, 2011, 01:16 AM

i think i can read live data. im useing a tool that hooks up to a laptop

Shaun03GT · February 28th, 2011, 01:27 AM

If so check your fuel rail pressure. See if its all over the place. When mine went out, it would go from 45 to 36 to 41 to 45psi etc... When I fixed it, it would read 38-40psi at idle.

Also check your short term fuel trims just to get an idea of how lean its running.

Maverick530 · March 1st, 2011, 03:01 PM

mmm kay, ive got three coils packs from the other gt engine (its at my dads shop and he took them off) but i dont know how to change them so this is going to be a learning experience one is a newer oem one from the looks of it, but is missing the cover to the two silver prongs and the other two ones i have are dirty but seem to be motorcraft.

bottled2v · March 1st, 2011, 05:43 PM

they're a sinch to change especially on cyl 5 which is the front drivers side. all you do is unplug the connector, and then there's a 7mm bolt you have to take out which is clearly visible, then just pull it off like you would a plug wire.

Maverick530 · March 1st, 2011, 06:45 PM

okay i did the change, and holy shit its so much better. when it idols it feels like my car is just turned off (its so smooth) and now i can accelerate from 40mph in 5th gear without my car jumping and running rough

Maverick530 · March 1st, 2011, 08:21 PM

One more problem, my car seems to run rich even though it says lean, and if it idols for too long it runs like it's the car from hell, it bucks and sounds aweful I guess it's flooding the Rpms goes down to like 500

Maverick530 · March 2nd, 2011, 01:45 AM

Originally Posted by Maverick530

One more problem, my car seems to run rich even though it says lean, and if it idols for too long it runs like it's the car from hell, it bucks and sounds aweful I guess it's flooding the Rpms goes down to like 500

grrr is still throwing out the miss fire codes, but it feels so much better....

February 26th, 2011, 05:36 PM	#1
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	Got a few codes i need help fixing guys :D okay well i scanned my car and got these codes p0171 too lean bank 1 p0174 p0305 cylinder 5 missfire and i think this is effecting some gas mileage so i want to fix this asap anyone know what to do?

February 26th, 2011, 06:55 PM	#2
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,808 iTrader: 1 reviews	Possible causes and diagnostic aids here... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

February 26th, 2011, 07:06 PM	#3
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	fix the misfire code fist as that can cause other codes. i'd bet it's a coil going out, swap the number 5 and number 6 coils and see if the miss moves to cylinder 6. if so replace the coil. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

February 27th, 2011, 12:40 PM	#5
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	you can buy them individually at a ford dealer or pretty much any parts store like autozone, oreily's, etc. any place should have a couple in stock. what i meant by "move to 6" is that if the misfire on cylinder 5 is due to the coil, and you swap the coils between cylinder 5 and 6 so that the "bad" coil is on cylinder 6 now, then your misfire code will move to cylinder 6. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

February 27th, 2011, 03:24 PM	#7
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,808 iTrader: 1 reviews	Keep in mind also that misfire does not immediately mean an ignition problem. The misfire monitor measures and compares the rotational velocity and acceleration of the crank--that's all. It doesn't know whether it'a an ignition, fueling, or compression issue; just that the crank rotation wasn't right. More about the misfire monitor here... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

February 27th, 2011, 03:57 AM	#4
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	it might move to six? right now i put some seafoam into my tank first to see if its just a dirty injector but were do i get coil packs, i can only find like 8 together

February 27th, 2011, 03:37 PM	#9
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	^ totally agree with the above 2 posts. swapping coils is easy, it'll rule out that as a possibility or it'll confirm it as the problem, and coils going bad is the more common problem rather than a bad injector or burnt valve or something of that sort. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

February 27th, 2011, 03:52 PM	#10
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	well i have another engine a few miles away that i forgot about, and ill take the coils off of that one, and some fuel injectors and what ever i need i guess

February 27th, 2011, 04:03 PM	#11
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,630 iTrader: 0 reviews	how many miles are on your car? Do you have the cats? I had those codes and one other on an aviator, compression was good, new coil and a new plug, Still missing. Ended up being a clogged cat. Im not saying thats the problem, just make sure you take it step by step and not over look anything __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

February 27th, 2011, 11:34 PM	#12
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	i have a catted x pipe, and have around 95 thousand, i have all my cats, but as for the coil pack its going to be free, because of my extra motor, and if need be i can get a new fuel injector. right now im just put a bottle of sea foam into my tank and its running a lot better but im sure i still have the miss fire

February 28th, 2011, 12:24 AM	#13
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,447 iTrader: 12 reviews	Could be the fuel rail pressure sensor. When mine went, I had 2 codes that popped up saying Lean in Bank 1 & 2. Can you view live data? using a scan tool or something? __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

February 28th, 2011, 01:16 AM	#14
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	i think i can read live data. im useing a tool that hooks up to a laptop

February 28th, 2011, 01:27 AM	#15
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,447 iTrader: 12 reviews	If so check your fuel rail pressure. See if its all over the place. When mine went out, it would go from 45 to 36 to 41 to 45psi etc... When I fixed it, it would read 38-40psi at idle. Also check your short term fuel trims just to get an idea of how lean its running. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

March 1st, 2011, 03:01 PM	#16
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	mmm kay, ive got three coils packs from the other gt engine (its at my dads shop and he took them off) but i dont know how to change them so this is going to be a learning experience one is a newer oem one from the looks of it, but is missing the cover to the two silver prongs and the other two ones i have are dirty but seem to be motorcraft.

March 1st, 2011, 05:43 PM	#17
bottled2v Hardcore Enthusiast '00 gt, '95 gt, '83 lx 11.85@116 Join Date: Oct 2010 Location: Saginaw, mi Posts: 2,429 iTrader: 0 reviews	they're a sinch to change especially on cyl 5 which is the front drivers side. all you do is unplug the connector, and then there's a 7mm bolt you have to take out which is clearly visible, then just pull it off like you would a plug wire. __________________ '00 GT, hp 292's, full bolt ons, built/stalled auto, 4.10's, 150 shot-new times to come. '95 GT, 347, tko, etc-11.8@116-sold. WTT-my mildly built 4r70 for t56/tko.

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March 1st, 2011, 06:45 PM	#18
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	okay i did the change, and holy shit its so much better. when it idols it feels like my car is just turned off (its so smooth) and now i can accelerate from 40mph in 5th gear without my car jumping and running rough

March 1st, 2011, 08:21 PM	#19
Maverick530 Hardcore Enthusiast 2001 Mustang GT Vert Average Join Date: Jun 2010 Location: Lafayette Louisiana Posts: 2,403 iTrader: 0 reviews	One more problem, my car seems to run rich even though it says lean, and if it idols for too long it runs like it's the car from hell, it bucks and sounds aweful I guess it's flooding the Rpms goes down to like 500

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