macca_mcfc Posted June 13, 2013 Share Posted June 13, 2013 Hi there i have a 2005 Sport R Impreza When i bought it the garage told me it failed its MOT on emissions. He never told me what he did to pass it. I wondered if he may of somehow turned down the Idle. I know how to do this on old cars but does anybody know the procedure for these. Much appreciated Quote Link to comment Share on other sites More sharing options...
Gambit Posted June 14, 2013 Share Posted June 14, 2013 Well my guess would be he used a donor car I.e one he knew would pass and just added your reg on the computer, very common thing to do :) They might have added something to the oil also just to lower it. I don't think he would have done anything to the idle unless it was over revving :) Quote Link to comment Share on other sites More sharing options...
Jay762 Posted June 14, 2013 Share Posted June 14, 2013 does it have a de-cat pipe fitted? Quote Link to comment Share on other sites More sharing options...
macca_mcfc Posted June 14, 2013 Author Share Posted June 14, 2013 I thought that maybe they have used a donar car. I have serviced it recently so doubt it's an oil additive. 500rpm when warm is slighly low tho. With the subaru brat I had we used to turn it down on the carb So might have a play with the IACV when I get home see what that does As for the de-cat ill have to look. Pretty sure it is very standard tho so I'm certain it has a cat :-) Quote Link to comment Share on other sites More sharing options...
Jay762 Posted June 14, 2013 Share Posted June 14, 2013 it shouldnt necessarily fail on emissions then - could be that a good service, injector clean and a few miles with decent fuel will clear the system out and get it combusting closer to optimum and sort the emissions Quote Link to comment Share on other sites More sharing options...
macca_mcfc Posted June 14, 2013 Author Share Posted June 14, 2013 Maybe so yeah. Ill have a look at the idle control valve see if I can make it a bit better Done a good thousand miles since owning it. No harm in it being so low can just be a bit of a pain when setting off. Ill sort it :-) Quote Link to comment Share on other sites More sharing options...
Gambit Posted June 14, 2013 Share Posted June 14, 2013 yeah your idle does sound low should be higher then 500RPM Quote Link to comment Share on other sites More sharing options...
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