So I had the FN2 for two years now and have been to two MOT's. My problem is the eco test. Normal is 0.2 CO2 emissions on idle and I have 1.6-1.7. The only thing I have changed is the flash (lowered VTEC engaging to 4500 rpm and upped the rpms to 8600) everything else is stock. The only way I was able to pass is to raise the rpms in neutral to 4500-5000 and let go off the throttle (must be several hard hard revs and keeping them for 15-20 seconds) then everthing goes to green (values drop in limits that are good on the MOT). The MOT guy said it must be something MAF sensor. Have been to a local Honda dealer and there are no faults on the MAF sensor and O2 sensor . So anyone having experience with these strange values? I am not "grandpa driving" my car and like to hit VTEC on a daily basis I so I dont think it is clogged up. Could it be the spark plugs that are old and not igniting all the fuel. I am on 57000 miles and I thing the spark plugs haven't been changed. Any advice you can give me ?
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