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High idle Nct fail

sonia847384
sonia847384
in Ford Fiesta Club

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Hey guys , 

me again lol , 2013 ford fiesta eco boost 

Failed nct (english mot) the lambda is supposed to be between 0.97 and 1.03 the first test was 1.09 so we treated it with diptane and got my exhaust checked , went to get a retest and it was 1.11 so it went up ? 

Anyone have any suggestions on what to do ? i’m really not sure 

  • Quote


    There's probably an exhaust leak.  That'll suck in extra oxygen from outside and make the lambda reading appear lean at the tailpipe.

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