Need some advice guys please, just taken my pre-facelift for MOT which it failed due to out of spec. emissions. I had a AEM mk2 installed September last year and had noticed that the car was using more fuel than before but seemed to running o.k otherwise ,even took it to Oulton Park recently for a track day.
Todays test results were as follows:-
CO - 4.135/ 4.098%
HC - 138/138 ppm
Lamda - 0.881/0.882
O2 -0.10/0.09 %
Should hold my hands up now and say that I put a fuel additive in a full tank a couple of weeks ago and haven't driven or re-fuelled the car since. I do that once a year to hopefully keep things clean. Think perhaps I should have run the petrol/aditive mix off and re-fuelled.
Is it worth putting the OEM ECU back in the car for retest or is the problem likely to be something else?
Any help would be appreciated, supposed to be, supposed to be north of Perth for a Drive it Day rally this weekend.