VBSTANG06
Junior Member
2006 GT with BBK not so cold air intake, Pypes long tube headers, cattless x-pipe/pypebomb axlebacks, Hitachi MAF (new), NTK upstream O2's (new w/downstream O2's turned off), clean stock 24lb injectors, OEM spark plugs/coils, stock intake manifold w/ OEM PCV hoses hooked up to it, and a Dyno tune.
It will start in open loop (lambda 1.00) w/STFT between -5 to +5 and LTFT slowly going + until O2's warm up (about 30 seconds) and switch to closed loop with lambda still at 1.00, stay in CL for 1 min, then OL again w/an immediate lambda of nice and rich (as low as .84 and as high as .98 just depends on ambient air temp I guess?) At idle while warming up and at operating temp (190° to 195°) my LTFT is both banks +22%, always in open loop with LTFT trending to zero under load (+3%). WOT is .82 lambda and decel is 1.05 lambda. O2's read .85 to .92 volts depending on what I'm doing.
MAF sensor reads .60 lbs/min at idle w/air conditioning off and .74 lbs/min w/ air conditioning on. Values increase with throttle and everything feels great while driving or idling.
My question is - Is my engine ok as is (running lean possibly due to mods/tune)? ECM is compensating for things appropriately. I have an OBD2 code reader w/live data stream to monitor behavior.
It will start in open loop (lambda 1.00) w/STFT between -5 to +5 and LTFT slowly going + until O2's warm up (about 30 seconds) and switch to closed loop with lambda still at 1.00, stay in CL for 1 min, then OL again w/an immediate lambda of nice and rich (as low as .84 and as high as .98 just depends on ambient air temp I guess?) At idle while warming up and at operating temp (190° to 195°) my LTFT is both banks +22%, always in open loop with LTFT trending to zero under load (+3%). WOT is .82 lambda and decel is 1.05 lambda. O2's read .85 to .92 volts depending on what I'm doing.
MAF sensor reads .60 lbs/min at idle w/air conditioning off and .74 lbs/min w/ air conditioning on. Values increase with throttle and everything feels great while driving or idling.
My question is - Is my engine ok as is (running lean possibly due to mods/tune)? ECM is compensating for things appropriately. I have an OBD2 code reader w/live data stream to monitor behavior.
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