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  1. T

    P0171 and P0174

    Still chasing cause :burnout::burnout:Here is some more info to replies of this posting. Ect and iat read within 4 degrees of eachother dead cold. ect 40 and iat 46 first thing in am. need to check dpfe. MAF was replaced already. o2's both replaced previously by someone else. I checked and they...
  2. T

    P0171 and P0174

    HI All, I have read a few threads on these codes. Background 98 4.0L, 2wd. I suspect a bad wiring at the MAF. REason is the BARO pid keeps setting back 4000ft elevation and I am sea level. The MAF has been replaced. No driveablity problem. Runs smooth lots of power. No obvious vacuum leak. Fauly...
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