Home Menu

Site Navigation


Toyota 4Runner Forum - Largest 4Runner Forum > > > P0171 - System Too Lean Bank 1
User Tag List

Reply
Page 3 of 4 1 2 3 4
 
Thread Tools Rate Thread Display Modes
Old 01-04-2021, 12:35 PM #31
19963.4lsr5 19963.4lsr5 is offline
Elite Member
  
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
19963.4lsr5 19963.4lsr5 is offline
Elite Member
 
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
Quote:
Originally Posted by clanofwolves View Post
I will on the O2s... I do some seafoam cleaning of the TB and I spray cleaner into the IAC when I am cleaning the MAF (the right brass screw is removed with a vice grip as the first attempted removal found her not budging, haha). I haven't paid an overwhelming amount of attention to the IAC, save I just insure she moves easily.

I pull the lower idle assist hose off the IAC and spray in there until no black chunks are visible in the inlet to it.


Sent from my iPhone using Tapatalk
19963.4lsr5 is offline   Reply With QuoteReply With Quote
Old 01-06-2021, 12:13 PM #32
clanofwolves's Avatar
clanofwolves clanofwolves is offline
Member
  
Join Date: Jun 2013
Location: Raleigh, NC
Posts: 76
clanofwolves is on a distinguished road
clanofwolves clanofwolves is offline
Member
clanofwolves's Avatar
 
Join Date: Jun 2013
Location: Raleigh, NC
Posts: 76
clanofwolves is on a distinguished road
Quote:
Originally Posted by LittleCaesar View Post
At least with the preliminary data, not a vacuum leak and probably not a direct fuel problem. Most likely an aging sensor. Post the new data once you have it.
Quote:
Originally Posted by Bad Luck View Post
I would replace the oxygen sensors
Quote:
Originally Posted by LittleCaesar View Post
+1 on changing out the 02 sensors.
What is the best brand (other than OEM) that you guys have had good luck with?
__________________
"Family and God - that is what's important. Money, cars, those are things that come and go."
clanofwolves is offline   Reply With QuoteReply With Quote
Old 01-06-2021, 12:50 PM #33
bear1998 bear1998 is offline
Member
  
Join Date: Aug 2020
Location: BIGLERVILLE
Posts: 80
Real Name: Bryan
bear1998 will become famous soon enough
bear1998 bear1998 is offline
Member
 
Join Date: Aug 2020
Location: BIGLERVILLE
Posts: 80
Real Name: Bryan
bear1998 will become famous soon enough
Denso....
bear1998 is offline   Reply With QuoteReply With Quote
Old 01-06-2021, 01:29 PM #34
Bad Luck Bad Luck is offline
Senior Member
  
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 4,410
Real Name: Patrick
Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute
Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 4,410
Real Name: Patrick
Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute
I replaced mine with Denso
__________________
2000 SR5 V6 Manual 4WD https://www.toyota-4runner.org/3rd-g...biography.html
2000 Limited V6 Auto E-Locker Sold 3/2022
Bad Luck is offline   Reply With QuoteReply With Quote
Old 01-06-2021, 01:39 PM #35
19963.4lsr5 19963.4lsr5 is offline
Elite Member
  
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
19963.4lsr5 19963.4lsr5 is offline
Elite Member
 
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
NTKs work also


Sent from my iPhone using Tapatalk
19963.4lsr5 is offline   Reply With QuoteReply With Quote
Old 01-06-2021, 03:49 PM #36
LittleCaesar's Avatar
LittleCaesar LittleCaesar is offline
Elite Member
  
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,801
LittleCaesar is just really nice LittleCaesar is just really nice LittleCaesar is just really nice LittleCaesar is just really nice
LittleCaesar LittleCaesar is offline
Elite Member
LittleCaesar's Avatar
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,801
LittleCaesar is just really nice LittleCaesar is just really nice LittleCaesar is just really nice LittleCaesar is just really nice
Been using the same Densos since 2009 with zero problems......
LittleCaesar is offline   Reply With QuoteReply With Quote
Old 02-11-2023, 12:00 AM #37
Grizzly Be4R Grizzly Be4R is offline
Junior Member
  
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Grizzly Be4R Grizzly Be4R is offline
Junior Member
 
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Exclamation
Hi everybody, I'm new to the forum trying to diagnose a P0171 code on my (new to me) '01 SR5.
So far, I've solved my P1135 & P0420 codes by replacing both O2 sensors with Denso.
For the unsolved P0171, I tried cleaning my MAF but the code returned. My next task was gonna be to check for a vacuum leak. Not sure if there's any common things I'm missing or could try? Thanks in advance for any input.
i recently bought the truck and the dealer didn't disclose multiple check engine codes so I'm hoping this is an easy fix
Last edited by Grizzly Be4R; 02-11-2023 at 12:04 AM.
Grizzly Be4R is offline   Reply With QuoteReply With Quote
Old 02-11-2023, 09:48 AM #38
JoeT4R's Avatar
JoeT4R JoeT4R is offline
Senior Member
  
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
JoeT4R JoeT4R is offline
Senior Member
JoeT4R's Avatar
 
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
Quote:
Originally Posted by Grizzly Be4R View Post
Hi everybody, I'm new to the forum trying to diagnose a P0171 code on my (new to me) '01 SR5.
So far, I've solved my P1135 & P0420 codes by replacing both O2 sensors with Denso.
For the unsolved P0171, I tried cleaning my MAF but the code returned. My next task was gonna be to check for a vacuum leak. Not sure if there's any common things I'm missing or could try? Thanks in advance for any input.
i recently bought the truck and the dealer didn't disclose multiple check engine codes so I'm hoping this is an easy fix
One toyota website suggests vacuum leaks like you're saying, but it also goes on to say that it could be a leak in the PCV hoses or even the valve itself.

If you replace the PCV valve, make sure you get a new grommet to go with it and take your time. Get it from Toyota, they are inexpensive. Have needle nose pliers on hand in case it begins to crumble and you get bits down
in the hole it comes out of.

Sent from my SM-S908U using Tapatalk
__________________
2001 SR5 4WD Build Thread
2007 Honda Accord 3.0L V6
JoeT4R is offline   Reply With QuoteReply With Quote
Old 02-12-2023, 03:30 PM #39
Texmax's Avatar
Texmax Texmax is offline
Member
  
Join Date: Oct 2022
Location: TROY
Posts: 118
Texmax is on a distinguished road
Texmax Texmax is offline
Member
Texmax's Avatar
 
Join Date: Oct 2022
Location: TROY
Posts: 118
Texmax is on a distinguished road
Quote:
Originally Posted by JoeT4R View Post
One toyota website suggests vacuum leaks like you're saying, but it also goes on to say that it could be a leak in the PCV hoses or even the valve itself.

If you replace the PCV valve, make sure you get a new grommet to go with it and take your time. Get it from Toyota, they are inexpensive. Have needle nose pliers on hand in case it begins to crumble and you get bits down
in the hole it comes out of.

Sent from my SM-S908U using Tapatalk
Get or find someone with a smoke machine. It'll save you a lot of time and money.
__________________
99 4wd limited w/ E/locker
3" RC lift-loaded struts. Sonoran Drop diff and adjustable rear Panhard.
JBA Offroad UCA's, Pro comp Raven 16x8 wheels wrapped in 265/75/16 Gladiator Mt ,APOC INDUSTRIES Rear Trailing arms.
RETIRED USCG Aviation Mechanic/Hc130h Flight Engineer/HH65-A Flight Mech.
SEMPER PARATUS
Texmax is offline   Reply With QuoteReply With Quote
Old 02-12-2023, 05:10 PM #40
JoeT4R's Avatar
JoeT4R JoeT4R is offline
Senior Member
  
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
JoeT4R JoeT4R is offline
Senior Member
JoeT4R's Avatar
 
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
Quote:
Originally Posted by Texmax View Post
Get or find someone with a smoke machine. It'll save you a lot of time and money.
This too!

Sent from my SM-T220 using Tapatalk
__________________
2001 SR5 4WD Build Thread
2007 Honda Accord 3.0L V6
JoeT4R is offline   Reply With QuoteReply With Quote
Old 02-18-2023, 10:12 PM #41
Grizzly Be4R Grizzly Be4R is offline
Junior Member
  
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Grizzly Be4R Grizzly Be4R is offline
Junior Member
 
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Question
Mechanic didn't detect a vacuum leak. Changed the MAF (new Delphi) and also replaced the PCV valve+ gasket.
CEL stayed off for about 100 miles and then popped back on. P0171. O2 sensors are new as well. Any other suggestions? I'll try to get a smoke test done soon if that's my only option besides the fuel filter..
Grizzly Be4R is offline   Reply With QuoteReply With Quote
Old 02-19-2023, 08:02 AM #42
JoeT4R's Avatar
JoeT4R JoeT4R is offline
Senior Member
  
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
JoeT4R JoeT4R is offline
Senior Member
JoeT4R's Avatar
 
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
Quote:
Originally Posted by Grizzly Be4R View Post
Mechanic didn't detect a vacuum leak. Changed the MAF (new Delphi) and also replaced the PCV valve+ gasket.

CEL stayed off for about 100 miles and then popped back on. P0171. O2 sensors are new as well. Any other suggestions? I'll try to get a smoke test done soon if that's my only option besides the fuel filter..
Fuel filter is an inexpensive fix. OEM filters go for about $40 iirc. If the inlet and outlet nuts aren't rusted on yours I'd suggest doing it yourself, it's not a hard job as long as the nuts can thread easily. Perhaps give that a shot, especially if it's never been done on your truck before and report back. If you need the p/n let me know.

Sent from my SM-S908U using Tapatalk
__________________
2001 SR5 4WD Build Thread
2007 Honda Accord 3.0L V6
JoeT4R is offline   Reply With QuoteReply With Quote
Old 02-19-2023, 10:10 AM #43
19963.4lsr5 19963.4lsr5 is offline
Elite Member
  
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
19963.4lsr5 19963.4lsr5 is offline
Elite Member
 
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold 19963.4lsr5 is a splendid one to behold
If the fuel filter doesn’t fix it look for cracks on the intake tube between the MAF sensor and the throttle body.


Sent from my iPhone using Tapatalk
19963.4lsr5 is offline   Reply With QuoteReply With Quote
Old 02-19-2023, 07:33 PM #44
Grizzly Be4R Grizzly Be4R is offline
Junior Member
  
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Grizzly Be4R Grizzly Be4R is offline
Junior Member
 
Join Date: Feb 2023
Location: Buffalo NY
Posts: 3
Grizzly Be4R is on a distinguished road
Thanks y'all. Will report back in the near future.
Grizzly Be4R is offline   Reply With QuoteReply With Quote
Old 03-14-2023, 02:23 PM #45
JoeT4R's Avatar
JoeT4R JoeT4R is offline
Senior Member
  
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
JoeT4R JoeT4R is offline
Senior Member
JoeT4R's Avatar
 
Join Date: Jul 2013
Location: NOVA
Posts: 1,457
JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light JoeT4R is a glorious beacon of light
Quote:
Originally Posted by Grizzly Be4R View Post
Thanks y'all. Will report back in the near future.
Any further updates on this? My rig is now having the P0171, even after clearing the code three times now with my ScanGauge.

Sent from my SM-S908U using Tapatalk
__________________
2001 SR5 4WD Build Thread
2007 Honda Accord 3.0L V6
JoeT4R is offline   Reply With QuoteReply With Quote
Reply
Page 3 of 4 1 2 3 4

Tags
bank , lean , p0171 , start , system

« Previous Thread | Next Thread »

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
P0171 Lean Bank appears and disappears Tundra9er 3rd gen T4Rs 12 08-29-2023 09:14 AM
P0171 Lean bank 1 Question jhueter 3rd gen T4Rs 43 08-21-2023 09:48 PM
P0171 - System Too Lean (Bank 1) nasdamus 4th Gen T4Rs 15 06-12-2019 03:40 PM
P0171 Code - Lean Bank 1... Help? jpontius 3rd gen T4Rs 5 02-23-2013 11:00 AM
P0171 (B1 System Too Lean) Rescue84 Problems & Warranty Issues 2 09-27-2006 03:47 PM

» Follow Us!!!
» Log in
User Name:

Password:

Not a member yet?
Register Now!
Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 02:57 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Toyota - 4Runner . org Forum Terms and Privacy Policy
Copyright © 2020