+ Reply to Thread
Results 1 to 7 of 7

Thread: Running Rich Again...

  1. 05-09-2009 12:20 PM #1
    devin_deville's Avatar
    devin_deville
    devin_deville is offline Rollin Like A Big Shot
    Join Date
    Nov 2008
    Location
    Jena, LA
    Posts
    150

    Exclamation Running Rich Again...

    So.. I finally went to get some O2 sensors. I got two bosch's. Installed them, and nothing has changed. My truck is still throwing codes P0172 (Fuel System Rich Bank 1) and P0175 (Fuel System Rich Bank 2). So bad oxygen sensors are not the problem anymore. I ran a vacuum leak tester over all of my vacuum hoses (I think) but it picked up nothing. The only thing it beeped on or around was my intake manifold, but if the gasket around it was leaking, wouldn't that mean i would be sucking in unmonitored air, and causing my truck to run lean, not rich? Oh and one more thing, could it be because i have an exhaust leak around the flange that connects the header to the exhaust pipe? It's just on one side though.. Anybody who can help, it would be appreciated. I have to get it running right before i start deeply modifying it. Thanks.
    5.3L, 4L60E, True Dual Exhaust, 40 Series Flowmasters, K&N Cold Air Intake, Nelson Performance PCM, 93 Octane, 0% TM, Ram Air Hood, 35" Pro Comp X-Terrain's, 18" Mazzi Sphinx Wheels. 3000 stall Yank, TCI clutches, Trans-go Shift Kit. Soon To Come:
    4.56's, Cam, PLT's
    Reply With Quote Reply With Quote
  2. 05-09-2009 02:42 PM #2
    Ramsey
    Ramsey is offline Senior Member
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    Maybe the intake leak is causing it to go rich by teling the computer its running lean by sucking air.I had the famous intake leak and didnt even know it till i changed it,i was throwing a code but i dont remember wich 1 it was.I wanna say 131.just change it if you think its leaking cause its a famous issue with these things. its easy you can do it by not even taking the complete intake off the motor,just throw a 2x4 under it pull the gaskets and replace .
    mods:2004 sierra ext sb,20s ,big brake kit w,hawk pads,air bagged,2006 6.0 lq4 swap,vortec supercharged10psi, air to water intercooled w/ dual electric fans on it ,snow meth injection kit,60lbers, e-fans ,big radiator swap ,cam 218 /222 548/550 comp .hardened prs .1.85 comp roller rockers ,guideplates ,crane double springs,trans 4l65e built .pacesetter l/ts true duals w/x pipe and magnaflows,14 bolt rearend swap ,3.73s,aroemotive fuel pump system w/elec.fuel controller and bypass regulator a/n fittings, taylor 10.5s interceptor gauge,aem w/b a/f ,autometer boost/vac NELSON 93 OCTANE TUNED .
    Reply With Quote Reply With Quote
  3. 05-09-2009 03:16 PM #3
    00shortbox's Avatar
    00shortbox
    00shortbox is offline GM Tech
    Send a message via MSN to 00shortbox
    Join Date
    Sep 2007
    Location
    Ottawa, ON
    Posts
    911
    If the intake is leaking it'd throw either P0171 or P0174 which are the lean codes. The PCM will richen the Fuel trims trying to correct the imbalance with the extra air it's sucking in. But you have the Rich codes, so it's either getting too much fuel from leaking injectors, or not enough air from a blocked air filter, pinched vaccum hose, etc.
    2000 Chevy Silverado RCSB LS6 5 speed, LS6 short block, 317 heads, LS6 intake, Lunati 220/224 .575/.575 112LSA cam, Edelbrock Headers, CTS-V accessory drive, Nelson Performance Custom Tune.
    Reply With Quote Reply With Quote
  4. 05-09-2009 11:39 PM #4
    GasGuzzler's Avatar
    GasGuzzler
    GasGuzzler is offline Pants on the ground
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,078
    Never waste time chasing an O2 code when you have an exhaust leak. Dude...
    Reply With Quote Reply With Quote
  5. 05-10-2009 05:00 PM #5
    wrenchead99
    wrenchead99 is offline Junior Member
    Join Date
    Dec 2008
    Posts
    14
    Quote Originally Posted by GasGuzzler View Post
    Never waste time chasing an O2 code when you have an exhaust leak. Dude...
    +1
    Old wrencheads never die, they just lose compression. I want a tatoo on my beer gut that says "alcohol injected"
    Reply With Quote Reply With Quote
  6. 05-11-2009 10:16 PM #6
    farmtruc's Avatar
    farmtruc
    farmtruc is offline Senior Member
    Send a message via AIM to farmtruc
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    Could be the maf sensor.
    Nelson Performance
    FastestTruckList.com
    NP on Facebook
    Youtube Channel
    '94 Chevy Truck: 8.9 et, 408 twins
    Reply With Quote Reply With Quote
  7. 05-11-2009 10:38 PM #7
    devin_deville's Avatar
    devin_deville
    devin_deville is offline Rollin Like A Big Shot
    Join Date
    Nov 2008
    Location
    Jena, LA
    Posts
    150
    The 02 codes went away.. knock sensor 1 & 2 circuit low frequency today. and i do recall a MAF sensor low voltage code a while back, but i cleared it and it went away.. air filters fine, and as far as i can see, there are no vacuum lines damaged. injectors shouldn't leak at 60K miles or am i wrong?
    5.3L, 4L60E, True Dual Exhaust, 40 Series Flowmasters, K&N Cold Air Intake, Nelson Performance PCM, 93 Octane, 0% TM, Ram Air Hood, 35" Pro Comp X-Terrain's, 18" Mazzi Sphinx Wheels. 3000 stall Yank, TCI clutches, Trans-go Shift Kit. Soon To Come:
    4.56's, Cam, PLT's
    Reply With Quote Reply With Quote
+ Reply to Thread
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules