HtrdlncN281 Posted June 29, 2011 Share Posted June 29, 2011 http://i35.photobucket.com/albums/d181/DSBirdman89/LearningView_SS_6-28-201174253PM.jpg What's causing my fuel trims to be off 10%? Any guesses? Link to comment Share on other sites More sharing options...
rtbrjason Posted June 29, 2011 Share Posted June 29, 2011 Is the car 100% stock down to the paper filter and intake resonator still intact? My guess is no and it maybe has a tune based on the AF and knock table ranges but these did seem to change a bit from year to year. I think most factory roms use up to 5.6 for the A range though. Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted June 29, 2011 Share Posted June 29, 2011 Boost/vac leak will throw off the afr but you may just need to rescale the maf. Link to comment Share on other sites More sharing options...
HtrdlncN281 Posted June 29, 2011 Author Share Posted June 29, 2011 Prolly shoulda mentioned im stg1 map otherwise bone stock. Link to comment Share on other sites More sharing options...
Legend Posted June 29, 2011 Share Posted June 29, 2011 Looks like a post-MAF leak if bone stock. Metered air going past MAF is escaping somehow and not getting burned. Leak is both at idle and on boost. Result is rich fueling. Rear O2 measures rich fueling, tells ecu to turn down the fuel, resulting in big negative fuel trims. Find the leak - should be an easier one to find since even leaking at idle - check TMIC. Not likely one of the many vacuum tubes since trims negative across the board. My '05 LGT My '07 Supercharged Shelby Link to comment Share on other sites More sharing options...
dcorwin822 Posted July 3, 2011 Share Posted July 3, 2011 I bet its because you said some bad mom jokes and got ur oil cap and wiper blades stolen. Link to comment Share on other sites More sharing options...
GTTuner Posted July 3, 2011 Share Posted July 3, 2011 Check the inlet tube near the turbo closely, your best bet is to use some carb cleaner and spray around potentol leak areas. Don't overlook a dirty MAF either. Link to comment Share on other sites More sharing options...
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