Question about 1991 Chevrolet S-10

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93 Jeep Grand Cherokee failing Emissions high O2

236,000 miles it has a brand new O2 sensor and MAP sensor(other reasons) spark plugs and wires appear fine.Put on sun machine and it's running from Lean to Rich.Was 1.25 before the o2 sensor which failed the test and with the new sensor 1.28 so I'm heading in the wrong direction! Other than that my gas mileage is same as always..running very well with no obvious problems including no vac leaks that could be detected..no codes coming up,air filter is clean...all the obvious has been replaced and or checked.I have 10 days before I have to put a temp tag on it and we are out of ideas.

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  • HPB-KME Jan 14, 2009

    That is where we were I was thinking next..it's one of the few parts on it that we have not replaced in the 5 years we have owned it

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  • Master
  • 716 Answers

Have You Checked The Catalytic Converter?

Posted on Jan 14, 2009

  • Michael Fisher
    Michael Fisher Jan 14, 2009

    Also Try Going To The Auto Part Store And Getting Plugs But Tell Them You Want Them To Be 1 Hotter.

  • Michael Fisher
    Michael Fisher Jan 14, 2009

    Rubber Mallet That ****** Maybe It Will Save You $120 Bucks.
    If Your Not Familiar With This Method You Pretty Much Just Hit The Heck Out Of It Then Start Rev Turn Off And Repeat Until You Stop Getting A Bunch Of Black Dust From The Tail Pipe.
    Sometimes Very Effective. I Call It Cleaning The Converter Filter lol


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