CEL: P0171 (System Too Lean)

Adam_T · 09-21-2009, 12:20 PM

Okay so I just brought my car back to stock. I had BC Stg2 cams, 410cc injectors, CAI, DC Race Header and a 2.5 inch catback exhaust...

Now I have stock cams, stock injectors, stock header/cat/exhaust, stock ECU (had kpro)...

Okay so now that everything is stock (except the CAI, I still have a fujitia CAI installed) I get the engine code P0171 which says system too lean.

What do you guys think? I checked all the tubing coming from the CAI into the engine and everything is good there. The injectors I ordered were used from a guy on the forums....he says they only had 30k miles but maybe they got clogged a bit during shipment?

Anywho....being stock, I don't know too much about the stock parts hahahaha. So I have no idea what could be doing this. Acura wants to charge me $240 just to find out what it is and I basically said fuckkkkk thatttt.

Help! Give me some known problems for this and some solutions. Thanks a lot.

Adam_T · 09-21-2009, 08:42 PM

ttt

Adam_T · 09-22-2009, 11:05 AM

ttt

rensoyka · 09-22-2009, 01:28 PM

if there are no other CEL codes then the likely problem is either low fuel pressure, malfunctioning injectors, improper valve clearances, faulty A/F sensor, faulty evap canister purge valve.

iKhaotic · 09-23-2009, 04:14 PM

i also have this code. how will this affect the car and how is it fixed?

Adam_T · 09-23-2009, 08:13 PM

Quote:

Originally Posted by rensoyka

if there are no other CEL codes then the likely problem is either low fuel pressure, malfunctioning injectors, improper valve clearances, faulty A/F sensor, faulty evap canister purge valve.

That's a lot of options....

I think it might be the injectors seeing how I just put the new (aka used stock injectors) in the other day and that is the day the code went on. I wonder how I can get them cleaned though....:-/

Jay · 09-23-2009, 08:25 PM

Chevron Techron will clean them (if they're dirty).

Adam_T · 09-23-2009, 08:38 PM

Im wondering...should I just run it through my gas tank? Or should I put all 4 of my injectors in a plastic zip-lock...pour a bit of the Chevron Techron in there (enough to cover all 4) and then submerse the bag in a Ultrasonic Cleaner (I do have access to one of these so...)

Anywho...

Jay · 09-24-2009, 04:49 PM

If you're ambitious, plan B would be the quickest. Plan A is the easiest and also effective, but takes longer.

Adam_T · 09-26-2009, 04:32 PM

So far so good with the Chevron Techron...CEL light still on of course (only have driven about 20 miles since I added it, and haven't reset the light yet) but there is no hesitation yet when hitting higher RPMS like there used to be.

Ill update as soon as I see something new.

iKhaotic · 09-26-2009, 05:41 PM

Quote:

Originally Posted by Jay

Chevron Techron will clean them (if they're dirty).

Chevron Techron = Texaco Techron?

they should be the same right? since they're the same company and all.....?

if so, i've been using Texaco Techron 85% of the time for the past 10k miles and when i pulled the codes a few days ago, the "system too lean" code is still there...

Adam_T · 01-22-2010, 07:37 AM

This code still isn't off my car yet....after these long months. I have had:

-both o2 sensors replaced under warranty b/c that's what acura said it was
-Valve-lash done to make sure clearances were good
-Timing chain adjustment (acura then said this was the problem and they did this)

engine light always came back on the next day. :-) YAY! Could it still possibly be the fuel injectors? I've ran 3 containers of Cheron Techtron since I've had this code.

what else could this be?! Basically all of the options that the code throws up have been "fixed".

bsivoljr · 02-28-2010, 01:54 AM

Fix the exhaust

guswaym · 02-28-2010, 02:17 AM

what sensor throws this CEL?

bsivoljr · 03-01-2010, 11:02 AM

Quote:

Originally Posted by guswaym

what sensor throws this cel?

o2

mtxjohn · 03-01-2010, 01:02 PM

I got that code, it was the primary o2 sensor. I also threw the code P0135. Im all stock-105k when this happened. Replaced primary o2 sensor and reset codes and all fixed.

nuno · 01-08-2012, 01:31 PM

Bringing this shitt up from the grave... I'm having the same code and it chokes on high rpms and vtec does not pop =( help

nuno · 01-09-2012, 09:33 AM

??

nuno · 01-09-2012, 09:12 PM

no one can help?

bsivoljr · 01-11-2012, 12:25 AM

Quote:

Originally Posted by nuno

no one can help?

Why don't you help yourself? Do you have any codes? Have you checked ANYTHING?

nuno · 01-11-2012, 12:49 AM

http://forums.clubrsx.com/showthread.php?t=806068

bsivoljr · 01-11-2012, 12:59 AM

Quote:

Originally Posted by nuno

http://forums.clubrsx.com/showthread.php?t=806068

Replied

09-21-2009, 12:20 PM	#1
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	CEL: P0171 (System Too Lean) Okay so I just brought my car back to stock. I had BC Stg2 cams, 410cc injectors, CAI, DC Race Header and a 2.5 inch catback exhaust... Now I have stock cams, stock injectors, stock header/cat/exhaust, stock ECU (had kpro)... Okay so now that everything is stock (except the CAI, I still have a fujitia CAI installed) I get the engine code P0171 which says system too lean. What do you guys think? I checked all the tubing coming from the CAI into the engine and everything is good there. The injectors I ordered were used from a guy on the forums....he says they only had 30k miles but maybe they got clogged a bit during shipment? Anywho....being stock, I don't know too much about the stock parts hahahaha. So I have no idea what could be doing this. Acura wants to charge me $240 just to find out what it is and I basically said fuckkkkk thatttt. Help! Give me some known problems for this and some solutions. Thanks a lot.

09-22-2009, 01:28 PM	#4
rensoyka Breast inspector by appt. Join Date: Aug 2005 Location: The Continuum Posts: 9,225 iTrader: (1)	if there are no other CEL codes then the likely problem is either low fuel pressure, malfunctioning injectors, improper valve clearances, faulty A/F sensor, faulty evap canister purge valve. __________________ '06 black type-s.

09-23-2009, 04:14 PM	#5
iKhaotic Senior Member Join Date: Sep 2008 Location: Orlando, FL Posts: 710 iTrader: (0)	i also have this code. how will this affect the car and how is it fixed? __________________ 2005 MM-S A-Spec \\\ Skunk2 \\\ Kenwood \\\ Retro-Solutions

09-23-2009, 08:25 PM	#7
Jay likes to troubleshoot Join Date: Dec 2001 Location: Arroyo Grande, CA Posts: 2,318 iTrader: (0)	Chevron Techron will clean them (if they're dirty). __________________ • base/auto • Comptech air filter •

09-24-2009, 04:49 PM	#9
Jay likes to troubleshoot Join Date: Dec 2001 Location: Arroyo Grande, CA Posts: 2,318 iTrader: (0)	If you're ambitious, plan B would be the quickest. Plan A is the easiest and also effective, but takes longer. __________________ • base/auto • Comptech air filter •

09-21-2009, 08:42 PM	#2
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	ttt

09-22-2009, 11:05 AM	#3
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	ttt

09-23-2009, 08:38 PM	#8
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	Im wondering...should I just run it through my gas tank? Or should I put all 4 of my injectors in a plastic zip-lock...pour a bit of the Chevron Techron in there (enough to cover all 4) and then submerse the bag in a Ultrasonic Cleaner (I do have access to one of these so...) Anywho...

09-26-2009, 04:32 PM	#10
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	So far so good with the Chevron Techron...CEL light still on of course (only have driven about 20 miles since I added it, and haven't reset the light yet) but there is no hesitation yet when hitting higher RPMS like there used to be. Ill update as soon as I see something new.

01-22-2010, 07:37 AM	#12
Adam_T Senior n00b Join Date: Jun 2007 Location: Charlotte, NC Posts: 1,627 iTrader: (26)	This code still isn't off my car yet....after these long months. I have had: -both o2 sensors replaced under warranty b/c that's what acura said it was -Valve-lash done to make sure clearances were good -Timing chain adjustment (acura then said this was the problem and they did this) engine light always came back on the next day. :-) YAY! Could it still possibly be the fuel injectors? I've ran 3 containers of Cheron Techtron since I've had this code. what else could this be?! Basically all of the options that the code throws up have been "fixed".

02-28-2010, 01:54 AM	#13
bsivoljr Dafkup Join Date: Oct 2009 Location: WHERE EVERYTHING IS BIG Posts: 1,899 iTrader: (5)	Fix the exhaust __________________ Had a K long before I bought the RSX...

02-28-2010, 02:17 AM	#14
guswaym Special Olympics Winner Join Date: May 2008 Location: Regina, Sask. Posts: 3,031 iTrader: (1)	what sensor throws this CEL? __________________ 2010 Honda Civic SI Sedan! 2003 Acura RSX Type-S SOLD 1989 Honda Accord SOLD

03-01-2010, 01:02 PM	#16
mtxjohn 02 blue type-s Join Date: Feb 2006 Location: MN Posts: 303 iTrader: (1)	what sensor p0171 I got that code, it was the primary o2 sensor. I also threw the code P0135. Im all stock-105k when this happened. Replaced primary o2 sensor and reset codes and all fixed. __________________ 2002 RSX-S (180,000 miles ) WD-40 stands for Water Displacement. It is NOT a proper lubricant. In fact, if you try to use it as such it will wash away (dissolve) any actual lubricant that was there to start with. I'm the top RSX on Fuelly!!! http://www.fuelly.com/driver/mtxjohn/rsx An armed man in a citizen, an unarmed man is a peasant. Last edited by mtxjohn; 03-01-2010 at 01:49 PM.

01-08-2012, 01:31 PM	#17
nuno gotta pay to play.. Join Date: Mar 2011 Location: Tampa, FL Posts: 2,910 iTrader: (65)	Bringing this shitt up from the grave... I'm having the same code and it chokes on high rpms and vtec does not pop =( help __________________ *Nuno's Official Show-off Thread (4-26-13 update)*

01-09-2012, 09:33 AM	#18
nuno gotta pay to play.. Join Date: Mar 2011 Location: Tampa, FL Posts: 2,910 iTrader: (65)	?? __________________ *Nuno's Official Show-off Thread (4-26-13 update)*

01-09-2012, 09:12 PM	#19
nuno gotta pay to play.. Join Date: Mar 2011 Location: Tampa, FL Posts: 2,910 iTrader: (65)	no one can help? __________________ *Nuno's Official Show-off Thread (4-26-13 update)*

01-11-2012, 12:49 AM	#21
nuno gotta pay to play.. Join Date: Mar 2011 Location: Tampa, FL Posts: 2,910 iTrader: (65)	http://forums.clubrsx.com/showthread.php?t=806068 __________________ *Nuno's Official Show-off Thread (4-26-13 update)*