Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

oxygen sensor

Discussion in 'The Garage' started by dammit32, Aug 31, 2006.

  1. dammit32

    dammit32 1/2 ton status

    Joined:
    Jul 20, 2002
    Posts:
    365
    Likes Received:
    0
    Location:
    Maine
    Hey - havent been on for a while but its good to see the site is doing well.

    I had my K5 parked for a little while so i could use the commuter car. When I started driving it ...it seemed to sputter some and has a little bit of a hard time on hills.

    I'm taking a stab in the dark that its the oxygen sensor. I'd like to know if there is a way to test it.

    money is slim here so I dont wanna buy it and be wrong.

    any feedback is GOOD feedback

    i did a search and didnt find much

    thanks in advance
     
  2. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

    Joined:
    Dec 21, 2005
    Posts:
    984
    Likes Received:
    0
    Location:
    Corn Country
    Blotto Zone would probably test it for free. Is the ECM giving out any trouble codes?
     
  3. loafer

    loafer 1/2 ton status

    Joined:
    Aug 19, 2003
    Posts:
    634
    Likes Received:
    0
    Location:
    Lyman, Maine
    If it's a factory TBI engine a bad O2 sensor will not cause the engine to run poorly. The ECU uses the O2 sensor to adjust fuel levels to optimize fuel economy. Usually the only ill effect of a bad o2 sensor is decreased fuel economy. If cash is tight, don't waste it on an O2 sensor.

    I would first check/change the fuel filter. Dump the gas out from the fuel filter and look for rust and water. It may be as simple as a new filter and fresh tank of fuel.
     
  4. stkcode

    stkcode Registered Member

    Joined:
    Nov 30, 2005
    Posts:
    86
    Likes Received:
    0
    Location:
    Apple Valley, CA
    x2 with what loafer said. One of the draw-backs with electric fuel pumps is they don't like sitting for long periods of time, without being used.
     
  5. dammit32

    dammit32 1/2 ton status

    Joined:
    Jul 20, 2002
    Posts:
    365
    Likes Received:
    0
    Location:
    Maine
    so i forgot to mention the Check engine light came on and then went off while i was driving.:confused:
     
  6. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
  7. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    How long was a little while?
     
  8. Tabb

    Tabb ROLL TIDE! AGAIN! GMOTM Winner

    Joined:
    May 2, 2006
    Posts:
    3,566
    Likes Received:
    21
    Location:
    Heart of Dixie
    First thing you need to do is take it out of your bung hole! sorry, I could'nt resist that one. I think any big parts store chain can test it. call 'em.
     
  9. Kamots

    Kamots Registered Member

    Joined:
    Oct 9, 2002
    Posts:
    47
    Likes Received:
    0
    Location:
    Oklahoma
    My '87 K5 blew a 02 sensor completely out. It turned on CEL often for short periods an turned off again. 5 minutes to replace an run correct again. Check em out.
     
  10. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    ?? its not JUST fuel economy. It uses it to decide how much fuel to send when. Thats not a function of fuel economy but any running engine... The O2 sensor is one part of the puzzle of fuel injection. Granted TBI doesn't look at the O2 sensor as heavily as most newer OBDII systems, but it is still an engine input device and still necessary for proper engine operation.

    If a O2 sensor being bad won't effect performance then how does a 3 wire O2 sensor improve performance in engines with headers? My 89 Suburban ran like piss when it was cold. It would spit and sputter when you jumped on it, and just run like total dog **** over all. I installed a 3 wire O2 sensor, and it ran like raped ape.
     
  11. loafer

    loafer 1/2 ton status

    Joined:
    Aug 19, 2003
    Posts:
    634
    Likes Received:
    0
    Location:
    Lyman, Maine
    The O2 sensor is used for running closed loop only, which means it's opperating in feed-back control mode with the O2 sensor providing the feedback. The o2 sensor only modifies the base value to the fuel table to opperate at a perfect stoicemetric mixture. It does not determine the fuel values.

    When the engine is cold, or when it is under high loads the ECU switches out of closed loop and runs open-loop, ignoring the sensor(s) all together because in these conditions the engines needs to opperate slightly rich or outside the opperating range of the sensor (rich @ WOT).

    O2 sensors require an opperating temperature of at least 600F to function. If you use headers the sensor is mounted in the collector and the EGT is too cold at that point to heat up a single wire sensor. This is why a heated o2 sensor (3 or 4 wire) is used. I run a 3-wire O2 sensor on my header equiped blazer for this reason. All newer vehicles use heated sensors becaue it heats up the sensors faster, which means the engine can enter closed loop sooner, reducing fuel consumption and reduce emissions.

    The 88 350 TBI I had would run fine with the 02 sensor unplugged completely. Our 91 caravan is the same way; unplug the sensor and it is fine. Of course the check engine light comes on and the fuel economy drops, but that's it.

    I should also add that depending on how the engine is tuned a bad sensor can cause a rough idle. But usually it just causes the engine to run rich.
     
  12. dammit32

    dammit32 1/2 ton status

    Joined:
    Jul 20, 2002
    Posts:
    365
    Likes Received:
    0
    Location:
    Maine
    I checked the codes and got a 22 tps voltage low
     
  13. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,069
    Likes Received:
    0
    Location:
    Ann Arbor Mi
    that makes a lot more sense than the o2 sensor being bad. check your wires going to the TPS before buying a new one, because more than jsut a bad sensor will cause that code to be thrown as in a broken wire
     

Share This Page