System too lean bank 1, can't find mechanic to help - Chevy Impala Forums

It appears you have not yet registered with our community. To register please click here...

Chevy Impala Forums

Go Back   Chevy Impala Forums > Performance and Technical > Chevy Impala 7th Gen Discussion

Chevy Impala 7th Gen Discussion W-Body 2000-2005. Discuss all Chevy Impala 7th Generation Performance and Technical Discussion here.

Reply
 
LinkBack Thread Tools Display Modes
Old 11-11-2013, 06:00 PM   #1 (permalink)
Junior Member
 
jgbride's Avatar
 
Join Date: May 2013
Posts: 15
Thanks: 1
Thanked 0 Times in 0 Posts
System too lean bank 1, can't find mechanic to help

I've been dealing with p0171,system to lean bank 1 ,for 6 months now. I have a 2000 impala ls 3.8 with 119k miles. The car runs like a charm without any hesitation what so ever which isn't like some cars I've heard about with this code. Anyway here is what's been done , new fuel filter, new mass air sensor , new upstream oxygen sensor, been on several different obdII scan tools and reset numerous times but this code comes back very fast every time. Now I know intake manifold gaskets are weak on these cars I've had a mechanic try to find vacuum leaks without luck and try the cabortator cleaner spray trick around the intake without luck. The mechanics I talk to don't sound interested in changing intake gaskets and plenum. Any suggestions? In my county we have emissions inspection and vehicles will not pass with the check engine light on no matter what code it is. Thanks guys

jgbride is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-11-2013, 06:23 PM   #2 (permalink)
Senior Member
 
auntjemima's Avatar
 
Join Date: May 2012
Location: Trenton, Ontario, Canada
Posts: 2,508
Thanks: 101
Thanked 371 Times in 279 Posts
Ontario eh?.. wonderful province ;)

Have you changed your air filter by chance?

auntjemima is online now   Reply With Quote Quick reply to this message
Old 11-11-2013, 07:32 PM   #3 (permalink)
1st Year of the 5th Generation

 
77Impala's Avatar
 
Join Date: Nov 2007
Location: North TX
Posts: 6,525
Thanks: 221
Thanked 230 Times in 144 Posts
Brake booster leaking? If so it would allow way to much air into the intake and be a hard vacuum leak to find with carb spray.

Vacuum hose that connects the MAP sensor if it has cracks it will allow to much air. Only way to tell is to remove the sensor from the back side of the UIM and check the hose.

__________________

1977 Chevrolet Impala Sedan, 5.0L, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 5.7L, 5 Speed, 3.08:1, 327K miles, 1 Lifetime Warranty Parts.
1997 Dodge Ram B2500, 5.2L, 36RH, 3.21:1, 378K miles, 33 Lifetime Warranty Parts.
77Impala is offline   Reply With Quote Quick reply to this message
Old 11-13-2013, 01:28 PM   #4 (permalink)
Junior Member
 
jgbride's Avatar
 
Join Date: May 2013
Posts: 15
Thanks: 1
Thanked 0 Times in 0 Posts
Actually I live in North Carolina I hate emissions testing, anyway yes I have changed my air filter pretty recently. I'm not sure about my brake booster I will check I have had my map sensor off to check my pcv valve but haven't really checked for a leak there I will look into it Would a faulty map sensor cause this code?

jgbride is offline   Reply With Quote Quick reply to this message
Old 11-13-2013, 04:28 PM   #5 (permalink)
1st Year of the 5th Generation

 
77Impala's Avatar
 
Join Date: Nov 2007
Location: North TX
Posts: 6,525
Thanks: 221
Thanked 230 Times in 144 Posts
No it would not since the lean condition is only on one side of the engine. This is a vacuum leak of some sort.

__________________

1977 Chevrolet Impala Sedan, 5.0L, TH200, 2.56:1, 106K miles, 37 Lifetime Warranty Parts.
1989 GMC C1500 Sierra ECSB 5.7L, 5 Speed, 3.08:1, 327K miles, 1 Lifetime Warranty Parts.
1997 Dodge Ram B2500, 5.2L, 36RH, 3.21:1, 378K miles, 33 Lifetime Warranty Parts.
77Impala is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
P0172 "Fuel Trim System Rich Bank 1" Walter89 Autocare and Maintenance 0 03-12-2012 07:12 AM
Too Lean? ejeezy_23 Chevy Impala 7th Gen Discussion 1 08-19-2011 10:19 AM
running lean? DrewImpala Chevy Impala 7th Gen Discussion 2 07-11-2011 11:52 AM
Lean codes help 96impala 6th Gen Engine Performance 0 06-29-2010 10:38 AM
system too lean? o2 sensor heater malfunction? clone 96 Mechanical and Electrical Problems 1 08-20-2008 08:12 PM




Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.
This site is not affiliated nor endorsed by General Motors Corp. Chevy Impala and related trademarks are the property of General Motors Corp.