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Truck Not running right

Discussion in 'Chevy Trucks' started by nate456789, Nov 29, 2010.

  1. nate456789

    nate456789 Senior Member
    from Indiana
    Messages: 194

    My K2500 with 5.7 is still not running right.
    It is running on fast idle all the time now.

    It has been acting funny ever since last year I had a new Y pipe made and installed along with new Exhaust manifolds. I don't see an O2 sensor on this truck. I Know it should have one.
    On my 94 it is at the collector. I don't even see any cut wires that could have had an O2 sensor on it.
    I have a feeling this could be part of the problem of why this truck has been giving problems last season and now again this . I only drive it when plowing. It sits the rest of the year.

    My question is where are the O2 sensors suppose to be and could I also have a faulty temp sensor making this thing stay on fast idle.
    Thanks
     
  2. chris694205

    chris694205 Senior Member
    Messages: 175

    what year is it?
     
  3. nate456789

    nate456789 Senior Member
    from Indiana
    Messages: 194

    1995 5.7 TBI. All stock. No Mods
     
  4. chris694205

    chris694205 Senior Member
    Messages: 175

    im not sure cause mine is a 97 vortec.. but i would assume that there will be 2 coming down before ( one on each side) the catalytic converter and one after the converter
     
  5. outlaw66

    outlaw66 Junior Member
    Messages: 15

    if i remember correct, there is only one, the 96's had 3 with the vortec sstyle fuel injection. if it is a higher miliage truck, the shaft in the throttle body can get play in and let air past butterflys and the engine will give more fuel to compensate thus making a higher idle. tbi tucks dont have a high idle like a carburated truck.

    more info onwhat else has been done, other issues could help to give you ideas