GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 14
  1. #1

    Default Losing power, throwing PO131 and PO151 codes when pulling a trailer.

    I had a lot of trouble this week pulling some grades with my 97 1500 Suburban (5.7L). I only had a very small trailer with an ATV on it behind me, not much weight at all. Had some similar problems last spring, pulling my boat. At that time, simply removing the gas cap seemed to solve the problem.
    This time, it would quickly bog down once I hit a grade, and I was only able to continue by shifting down to 2nd and keeping my foot out of the throttle. If I stepped on the gas, it would typically throw PO131 and PO151 codes (O2 circuit low voltage). I would then have to reset the codes before I could continue.
    A little background (I have been posting on some issues with this rig over the last year or so). In the last year, the spark plugs, spark plug wires, cap (twice), rotor, fuel filter (twice), fuel pump, fuel pump wiring harness, gas cap, and all four O2 sensors and both catalytic converters have all been replaced.
    I am still getting almost 65 psi fuel pressure at ON, and about 55 psi at idle. I have blown compressed air through the vent line (tank to charcoal canister) and the air is getting through okay.

    Any ideas on why I might still be having trouble?

  2. #2

    Default

    Quote Originally Posted by boycbronco View Post
    I had a lot of trouble this week pulling some grades with my 97 1500 Suburban (5.7L). I only had a very small trailer with an ATV on it behind me, not much weight at all. Had some similar problems last spring, pulling my boat. At that time, simply removing the gas cap seemed to solve the problem.
    This time, it would quickly bog down once I hit a grade, and I was only able to continue by shifting down to 2nd and keeping my foot out of the throttle. If I stepped on the gas, it would typically throw PO131 and PO151 codes (O2 circuit low voltage). I would then have to reset the codes before I could continue.
    A little background (I have been posting on some issues with this rig over the last year or so). In the last year, the spark plugs, spark plug wires, cap (twice), rotor, fuel filter (twice), fuel pump, fuel pump wiring harness, gas cap, and all four O2 sensors and both catalytic converters have all been replaced.
    I am still getting almost 65 psi fuel pressure at ON, and about 55 psi at idle. I have blown compressed air through the vent line (tank to charcoal canister) and the air is getting through okay.

    Any ideas on why I might still be having trouble?
    For Trouble Code's.....P0131 and P0151.......may mean that one or more of the following has happened:

    • Faulty 02 oxygen sensor
    • Short to voltage on O2 signal circuit
    • High resistance or open on O2 signal circuit

    Possible Solutions


    • Replace faulty sensor
    • Repair short, open, or high resistance on 02 signal circuit

    As you have just replaced the.....02 Sensor's.....I would take a look at them, loose connection??......what Brand of 02 Sensor's did you go with/install??.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    Mike, I will take a look at the wires and connections on the sensors to make sure nothing is shorting out. I replaced them all 4 with Bosch sensors. Hope I don't have to do that again, as it cost a small fortune just to do that!

  4. #4

    Default

    Quote Originally Posted by boycbronco View Post
    Mike, I will take a look at the wires and connections on the sensors to make sure nothing is shorting out. I replaced them all 4 with Bosch sensors. Hope I don't have to do that again, as it cost a small fortune just to do that!
    Sorry to say and with all due Respect....In some cases Going with and Staying with Factory/OEM Parts......is the Best Way to go.....and this is one of those Cases, also what Brand of Spark Plugs did you go with/install??
    Last edited by 99'HEARTBEAT; 03-13-2013 at 05:27 PM.

  5. #5

    Default

    Great. I'm sure the factory ones will cost twice as much. I looked at all four and no bare wires, no disconnects, nothing to suggest there would be a short. The plugs are AC/Delco.

    Looking real quick on line, I see O2 sensors by AC/Delco, Delphi, Walker, Denso, Standard, SNG, and NTK. I presume you recommend the AC/Delco, any others?

  6. #6

    Default

    Quote Originally Posted by boycbronco View Post
    Great. I'm sure the factory ones will cost twice as much. I looked at all four and no bare wires, no disconnects, nothing to suggest there would be a short. The plugs are AC/Delco.

    Looking real quick on line, I see O2 sensors by AC/Delco, Delphi, Walker, Denso, Standard, SNG, and NTK. I presume you recommend the AC/Delco, any others?
    The 02 Sensor's are not Cheap and that's for sure!!!......Amazon has A/C Delco 02 Sensor's for your 97" Suburban......for a Very Good Price,

    http://www.amazon.com/ACDelco-AFS105-Oxygen-Sensor/dp/B0013FWACW/ref=au_pf_pfg_s?ie=UTF8&Model=C1500 Suburban|425&n=15684181&s=automotive&Make=Chevrole t|47&Year=1997|1997&vehicleType=automotive&newCar= 1&carId=005


    Delphi is another one to look at......and on the Plugs you've got the A/C Delco, once again those are the ones you want.

  7. #7

    Default

    I've sold hundreds of Bosch O2 sensors, never had a compliant. Don't bother to touch the rear sensors till the truck is running correctly. They have zero input on Engine Control.
    When you hear hoofbeats, look for horses not zebras.

  8. #8

    Default

    So, do you recommend swapping out the pre-catalyst sensors only, then?

  9. #9

    Default

    Quote Originally Posted by boycbronco View Post
    So, do you recommend swapping out the pre-catalyst sensors only, then?
    I would agree with 2COR517 on replacing just the Up-Stream(Pre-Cat) Sensor's only.

  10. #10

    Default

    Thanks for the tips and the link to the Delco sensors at Amazon. I hope it works ... since the other sensors are still only a few months old.

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. Replies: 11
    Last: 08-04-2010, 01:39 AM
  2. Pulling Codes...
    By Thunderchild in forum Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)
    Replies: 3
    Last: 03-23-2010, 09:25 AM
  3. quick question about pulling codes
    By 25lighters in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 0
    Last: 03-12-2010, 01:05 PM
  4. obd2 codes throwing me off
    By greasemonkey in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 02-28-2010, 01:46 PM
  5. superchip tuner and pulling a trailer
    By jjjg_02 in forum General Chevy & GM Tech Questions
    Replies: 1
    Last: 02-20-2010, 01:54 AM

Tags for this 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
  •