Chris Wilson Posted October 7, 2014 Share Posted October 7, 2014 2 minutes with an MOT stations gas analyser up the exhaust while you twiddle the fpr will show if the map is lean. By raising the fp you are crudely re mapping all the fuel cells richer. I am a firm believer in having a new build on the dyno and with the mapper present from the get - go. Link to comment Share on other sites More sharing options...
mellonman Posted October 7, 2014 Share Posted October 7, 2014 Thank god for that , you just dont know sometimes though how much people know or dont know from what you are discribing I dont believe that there is anything wrong with your wide band and the 16 afr is whats causing you to have the misfire, unplug your stock o2 and im sure that your afr will go down into 13-14's ( not sure if that will be the same for the mines ecu though) and your misfire may disapeare , all in all good luck for thursday i would be a little concerned if its misfiring still with low boost driving around the block if your afr's are in the 13-14's timing maybe way out Link to comment Share on other sites More sharing options...
Mk4Gaz Posted October 7, 2014 Author Share Posted October 7, 2014 Cheers gents, I'm planning on taking a real steady drive to the dyno, it's only about 20 miles away almost all A road, so I'll just be gently plodding along, and I certainly won't be giving it any abuse! It's currently got the stock ecu plugged in, my plans are to swap the mines in at the rr, and let them map to that. At least it saves me having a separate sld and fcd wired in. Link to comment Share on other sites More sharing options...
mellonman Posted October 7, 2014 Share Posted October 7, 2014 the fcon can get rid of that anyway but I would also map to the mines 20 miles of misfire that you know to be lean is still a danger unplug the stock o2 and see if it improves the afr and go from there Link to comment Share on other sites More sharing options...
Mk4Gaz Posted October 7, 2014 Author Share Posted October 7, 2014 I'll give it a go, thanks for help bud. I'll update later. Incidentally, would you unplug it once it's warmed up, or is the stock ecu not overly fussed and will start from cold with it unplugged? Link to comment Share on other sites More sharing options...
mellonman Posted October 7, 2014 Share Posted October 7, 2014 it wont care all that will happen is that the car will run in open loop with fail safe rich map , Link to comment Share on other sites More sharing options...
Mk4Gaz Posted October 7, 2014 Author Share Posted October 7, 2014 Superb, thanks mate Link to comment Share on other sites More sharing options...
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