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o2 sensor

  1. Air injection nightmare - need help!!

    OEM Issues
    So I got the code for air injection problems. I replaced the check valve. Replaced the air filter. Replaced the air pump (smog pump) relay. Took the pump to a local parts store and we hooked a battery to it and it started running, so I assume it is good? What to do next? I'm at the end and...
  2. O2 Sensor & Tstat cause loss of power under load?

    OEM Issues
    Hey Guys, I have an 2005 TB with the 4.2L. Lately I have been having problems with intermittent power loss under a load (acceleration). The engine RPM remains the same yet there is decreased power. Everything is telling me it is a partially plugged CAT, but the local chevy dealer is blaming it...
  3. Intermitten Misfire / Rough Idle

    OEM Issues
    I have been dealing with a misfire code for a few months that only occurs if the truck has been idling for a few minutes, finally got around to working on it a bit. This is what I have done thus far. New spark plugs 3 new coils including the one on cylinder 5 (the cylinder throwing the misfire...
  4. New york o2 problem

    OEM Issues
    Alright, I own a 2004 Chevy trailblazer 4x4 4200 I6. I had a clogged cat and instead of dropping the 600+ on replacing it I straight piped it. Now that dang CEL keeps coming on :hissy: Now i replaced the O2 sensor as a precautionary for further problems and used the nonfouler set up to keep the...
  5. No movement in the throttle valve???

    I am trying to determine if my throttle valve is stuck. I have cleaned the throttle body thoroughly, however when putting things back together I decided to keep the main hose off so that I can look at it functioning. Starting it up the value does not move nor does it when revving the engine to...
  6. Will I damage my engine by disconnecting O2 sensor?

    OEM Issues
    I am trying to replace the O2 sensor in the exhaust manifold. It is in really tight, so the slotted O2 sensor socket cannot grab it securely enough for me to take out the sensor. I am thinking about cutting the wires and using a regular socket. If I do, and still cannot remove the sensor, will I...