Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 6 of 6

Thread: 05 STS with 4.6. P0174 Lean bank 2 Fixed

  1. #1
    nwjones18 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 STS V8
    Join Date
    Feb 2013
    Location
    Georgia
    Age
    30
    Posts
    208

    05 STS with 4.6. P0174 Lean bank 2 Fixed

    Just thought I would post this fix incase others are having similar problems. My car has around 90k on it and a couple days ago I got a CEL. I went looking for vacuum leaks since that's the easiest thing to cause a lean code. I found that the rubber ends on the vacuum pipe that goes from the passenger side valve cover to the rear of the intake manifold were totally disintegrated. the Pipe is 3/8 and I had some fuel line laying around so I just cut a piece for either end and replaced it. Getting the hose off the back of the intake is a challenge but doable. Hope this helps someone, I have to figure that everyone with the N* will run into this at some point.


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    Location
    MD Eastern Shore, Kent Island
    Age
    77
    Posts
    56,864

    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    PCV dirty air line connector breaks are common across the Northstar line. If necessary, that entire line can be replaced with a length of proper ID fuel line - fuel line has a reinforcing braid molded in.

    Any of the other preformed plastic vacuum pipes and connectors may be replaced with lengths of proper ID vacuum hose from the Help! racks at parts stores.

    Thanks for the feedback. P 017X codes are usually vacuum leaks - they show up as "lean mixture codes".

  4. #3
    achavez's Avatar
    achavez is offline Cadillac Owners Member
    Automobile(s): 2005 STS 4.6ltr 1SE
    Join Date
    Aug 2013
    Location
    California
    Age
    31
    Posts
    34

    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Thanks for the input. These engine bays run extremely hot. Hotter than my turboed 4cyl awd sedan I had. Thats very harsh on the lines, wires, connectors

  5. #4
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
    Automobile(s): 2006 STS4 V8 1SG & 2007 STS V8 1SE
    Join Date
    Jun 2008
    Location
    Cedarburg, WI
    Age
    59
    Posts
    8,178

    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Lean can also mean loose intake bolts; lkewise mileage appropriate. In my car, it took about 20 ignition cycles for it to clear after I reattached a hose & tightened bolts.

    Today, a month later, passed WI OBD emission test w/o ever having the code reset.

  6. #5
    nwjones18 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 STS V8
    Join Date
    Feb 2013
    Location
    Georgia
    Age
    30
    Posts
    208

    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    Quote Originally Posted by EChas3 View Post
    Lean can also mean loose intake bolts; lkewise mileage appropriate. In my car, it took about 20 ignition cycles for it to clear after I reattached a hose & tightened bolts.

    Today, a month later, passed WI OBD emission test w/o ever having the code reset.
    I preemptively tightened the intake bolts when i first got the car. They were all quite loose. I just cleared my codes with a scanner.

    Thanks though!

  7. #6
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
    Automobile(s): 2006 STS4 V8 1SG & 2007 STS V8 1SE
    Join Date
    Jun 2008
    Location
    Cedarburg, WI
    Age
    59
    Posts
    8,178

    Re: 05 STS with 4.6. P0174 Lean bank 2 Fixed

    How long ago? Did you torque them?

    I recall one member reported that after the previous owner had overtightened his, they wouldn't hold and I think he ended up replacing the gasket.


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum