Question about 2004 Chevrolet Cavalier

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My car would not start, was cranking but not turning over. My cat converter was bad, I replaced it but now my car is running like **** and when driven my cat converter turns bright red. I replaced both O2 sensors and it stayed running but my car was still running bad. It is also throwing a multiple misfire code, so I replaced the coil pack and now my car wont start at all again. I also checked the spark plugs and they look fine...

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  • kathi_robins Sep 29, 2009

    Im not quite sure if I cleaned the right sensor, but the one is small and round in the intake ducting and there was no change. i did replace both o2 sensors and it did not change. I also replaced my spark plugs on a whim and that did nothing... I am completely at a loss at this point, any other ideas?

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  • Chevrolet Master
  • 3,433 Answers

Running extremely lean. Did you replace the 02 sensors? They detect lean and rich conditions and if the previous problem was too rich, the 02 sensors may have set ecu to run lean because of their problem. Now converters are free flowing and the settings should have again adjusted itself if the 02 sensors haven't flaked out. Overheating is and a fire hazard.destrucive to a converter and as hot as you say they are getting is not good. Do this, in the intake ducting is a sensor call a maf sensor. It's in a metal section. See how dirty it is. Then buy a spray can of CRCelectrical cleaner and spray wash the sensor thoroughly. Do not touch, rub, or brush the sensors, Just rinse dirt away with spray. The sensor is delicate, sensitive and very expensive to replace. DO NOT USE COMPRESSED AIR! The spray will dry quickly. Good Luck and make sure you have a clean air filter. Let me know if you will please.Ned

Posted on Sep 29, 2009

  • Ned C Cook
    Ned C Cook Sep 29, 2009

    The Maf sensor has a platinum strip on it and is flat. You probably cleaned the intake air temp sensor. No harm.just need to get the right one.

  • Ned C Cook
    Ned C Cook Sep 29, 2009

    OK< LET"S GO STRAIGHT TO THE map sensor> tHIS ONE IS EASY. map STANDS FOR MANIFOLD ABSOLUTE PRESSURE. tHERE IS A VACUUM HOSE ABOUT 1/4 " DIAMETER. mAKE SURE THAT HOSE IS OK, NO CRACKS AND IT FITS SNUG.

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A FixYa rating would be nice Please !

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