jQuery not supported.



Random Bank 1,2 lean codes

Confused

Random Bank 1,2 lean codes

Postby bobbabouie91 [OP] » May 22 2011, 5:08am

My truck runs great, except every once in a while my check engine light comes on and reads that both bank 1 and 2 are running too lean. But throws no other codes. Usually the code goes away on its own. But I've noticed sometimes, Very rarely, when I go to take off it will hesitate. I've checked th o2 sensors and theyre fine, cleaned the MAF sensor. Could this possibly result from a clogged fuel filter? It's my only guess, cuz it has been probably 10-15,000 miles since I've changed it
Original Poster
bobbabouie91
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Images: 4
Blogs: 3
Joined: May 03 2011, 2:28am
Years of membership: 2 years of membership2 years of membership
Location: Salina, Kansas
Year: 1999
Make/Model: Chevrolet Silverado
Extra Info: z71 5.3
Group Membership:
Registered users
Related Topics  5.3 not firing bank 2   DTC P0430 Bank 2   K&N/DiabloSport inTune - Engine Running Lean   Random Rattling   random misfire   Random Revving for No Reason   Random power loss   2005 5.3 Random Loss of Power   2004 Silverado 1500 5.3 Random Misfire HELP!!!!   Multiple random misfires on 1998 vortec   random multiple misfire soo bad you can feel it   Poor running, bad mileage and now a random misfire, too!   Clogged Cat or Bad 02 Sensor? Random Misfire...   Ok the codes are in.. 
Vortec 5300 5.3L V8 Sponsor
Advertise Here

Re: Random Bank 1,2 lean codes

Postby gmctruckguy » May 25 2011, 3:59am

How long has it been doing this? Maybe bad fuel? Do you have any mods on it?
10638His & Hers 2012 Sierra C/C's 6.2L, 4WD, 3.73's, Airaid CAI, Diablo Predator/inTune, Magnaflow Exhaust, Piaa's, 3 1/2" RC Lift, 285 BFG T/A's, Bushwacker Flares, Tuff Country Add-a-Leaf
1063910640

User avatar
gmctruckguy
Automotive Technician
Automotive Technician
Shifting into Gear [L3]
Shifting into Gear [L3]
Posts: 1017
Topics: 24
Images: 37
Blogs: 1
Joined: Nov 28 2010, 1:38am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Alberta
Year: 2012
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: Max Trailering
Group Membership:
Automotive Technicians
Registered users

Re: Random Bank 1,2 lean codes

Postby bobbabouie91 [OP] » May 25 2011, 4:17am

Ive only noticed it for maybe the last 5000 miles. The only mods are cai and exhaust. Otherwise bone stock
Original Poster
bobbabouie91
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Images: 4
Blogs: 3
Joined: May 03 2011, 2:28am
Years of membership: 2 years of membership2 years of membership
Location: Salina, Kansas
Year: 1999
Make/Model: Chevrolet Silverado
Extra Info: z71 5.3
Group Membership:
Registered users

Re: Random Bank 1,2 lean codes

Postby gmctruckguy » May 25 2011, 4:21am

Well those mods could possibly kick out those codes. Check for air leaks in your CAI, tighten up all the hose clamps and check for exhaust leaks anywhere.
10638His & Hers 2012 Sierra C/C's 6.2L, 4WD, 3.73's, Airaid CAI, Diablo Predator/inTune, Magnaflow Exhaust, Piaa's, 3 1/2" RC Lift, 285 BFG T/A's, Bushwacker Flares, Tuff Country Add-a-Leaf
1063910640

User avatar
gmctruckguy
Automotive Technician
Automotive Technician
Shifting into Gear [L3]
Shifting into Gear [L3]
Posts: 1017
Topics: 24
Images: 37
Blogs: 1
Joined: Nov 28 2010, 1:38am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Alberta
Year: 2012
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: Max Trailering
Group Membership:
Automotive Technicians
Registered users

Re: Random Bank 1,2 lean codes

Postby bobbabouie91 [OP] » May 25 2011, 4:46am

I do have a slight exhaust leak coming from the manifold, why would that make the computer lean my system?
Original Poster
bobbabouie91
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Images: 4
Blogs: 3
Joined: May 03 2011, 2:28am
Years of membership: 2 years of membership2 years of membership
Location: Salina, Kansas
Year: 1999
Make/Model: Chevrolet Silverado
Extra Info: z71 5.3
Group Membership:
Registered users

Re: Random Bank 1,2 lean codes

Postby gmctruckguy » May 25 2011, 4:48am

Because your getting air into your exhaust and then your O2 sensors are picking it up and thinking your exhaust is lean, ie has to much air compared to fuel in it.
10638His & Hers 2012 Sierra C/C's 6.2L, 4WD, 3.73's, Airaid CAI, Diablo Predator/inTune, Magnaflow Exhaust, Piaa's, 3 1/2" RC Lift, 285 BFG T/A's, Bushwacker Flares, Tuff Country Add-a-Leaf
1063910640

User avatar
gmctruckguy
Automotive Technician
Automotive Technician
Shifting into Gear [L3]
Shifting into Gear [L3]
Posts: 1017
Topics: 24
Images: 37
Blogs: 1
Joined: Nov 28 2010, 1:38am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Alberta
Year: 2012
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: Max Trailering
Group Membership:
Automotive Technicians
Registered users

Re: Random Bank 1,2 lean codes

Postby bobbabouie91 [OP] » May 25 2011, 12:50pm

I would think that would cause the system to add more fuel to compensate, therefore throwing a too rich code, I'm not sure though. Im no expert
Original Poster
bobbabouie91
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Images: 4
Blogs: 3
Joined: May 03 2011, 2:28am
Years of membership: 2 years of membership2 years of membership
Location: Salina, Kansas
Year: 1999
Make/Model: Chevrolet Silverado
Extra Info: z71 5.3
Group Membership:
Registered users

Re: Random Bank 1,2 lean codes

Postby gmctruckguy » May 25 2011, 2:43pm

You would THINK thats what it would do but you still have other sensors on the engine, ie. MAF, IAT, MAP, that is measuring air coming in, telling the computer how much fuel to mix to keep it at stoichiometric (14.7/1) the O2 sensors are reading what is coming out of the compustion chamber (or in this case oxygen leaking into the exhaust) it will compensate to an extent but its reading what is down stream, whether its lean or rich.
10638His & Hers 2012 Sierra C/C's 6.2L, 4WD, 3.73's, Airaid CAI, Diablo Predator/inTune, Magnaflow Exhaust, Piaa's, 3 1/2" RC Lift, 285 BFG T/A's, Bushwacker Flares, Tuff Country Add-a-Leaf
1063910640

User avatar
gmctruckguy
Automotive Technician
Automotive Technician
Shifting into Gear [L3]
Shifting into Gear [L3]
Posts: 1017
Topics: 24
Images: 37
Blogs: 1
Joined: Nov 28 2010, 1:38am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Alberta
Year: 2012
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: Max Trailering
Group Membership:
Automotive Technicians
Registered users

Return to Vortec 5300 5.3L V8

 

  • Similar topics
    Replies
    Views
    Last post

Common search terms

exhaust fuel miles random check engine codes think bank lean since keep getting make great stock light still

It is currently Apr 17 2014, 4:54am

Login  •  Register
SHOP TALK (Live Chat)
Vortec 5300 5.3L V8 Forum
Vortec 5300 5.3L V8 specific.
To create a new topic in Vortec 5300 5.3L V8, click this button:
Previous topic Next topic

Network Link:
Chevy Silverado Parts

Random Image Attachments
Platsti dipping my truck
Platsti dipping my truck
Attached by: nonelower2001
99 1500 part off
99 1500 part off
Attached by: Jeepa777
Made myself a replica RB...
Made myself a replica RB...
Attached by: icefshn
Voodoo's 2011 Silverado ...
Voodoo's 2011 Silverado ...
Attached by: Voodoo
Sitewide News Sitemaps & Feeds

Who is online

Users browsing this forum: Google Adsense [Bot] and 20 guests