» » »

Mercedes-Benz Q&A

Ask Your Question

1992 Mercedes-Benz 300E Question: my 300e mercedes-benz 1992 failthe emission due to adle reading 262 allowed 220

 

Question

boyse, Lithonia, GA, October 01, 2012, 14:58
 Rookie

what would cause high idle rpm test

1 Answer
Flag This
  • Answer #1

    Greg's Orange Auto (13991 Answers) , Orange, CA - (714) 361-9386
    globalhelper October 02, 2012, 06:18
     Master

    i assume that your talking hardra carbons. if so it indicates a slight misfire or poss bad catt. are the other readings good?

    Flag This
  • Reply

    boyse, October 02, 2012, 17:54
     Rookie

    The other reading is good hc ppm 97 co51idle rpm 262 allowed 220 co+c02 13.7 how wouldyou know that your catt bad

    Flag This
  • Reply

    globalhelper, October 03, 2012, 05:49
     Master

    your co2 is slightly low should be 14.2 which means your mixture is off a little have catt temp ck w/ digital therm. see how hot it is in the frt and then ck the rear of catt. if not sure ck with a muffler shop

    Reply
    Flag This