Originally Posted by iquiksn95
hey sorry i took so long to reply buy i already replaced the 02's and still the same problem runing 10.3 at idle and 11.3 part throttle 10.00 wot my tune guy keeps pulling fuel out and nothing maybe the ecm???
WOT operation is pretty much unrelated to the O2
sensors, other than that long term fuel trims are learned in part from the short term trims. You need to look at fuel pressure, the MAF transfer function to make sure it matched your MAF; the high injector slope scalar setting and the values in the Stabilised Open Loop Fuel
(SOLF) table in the tune.
Injector pulse width in open loop is "reverse engineered" from the target AFR in the SOLF. The PCM usese what it has been told about the injector "high slope" (lb/h) capacity, air flow from the MAF, fuel pressure (it sort of assumes it is as it has commanded), ECT, IAT and a few other things to calculate the injector pulse width.
If any of these values/assumptions/observations are incorrect then the calculated pulse width will also be incorrect--and the mix will be incorrect...
- 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq