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Don't hate!
Join Date: Feb 2007
Location: N.E. SA
Posts: 8,415
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Ford's 02 sensors have a tendency to learn lean and rich conditions which lead to slow/lazy readings and ultimately failed sensors. The above poster obviously did a copy and paste from a google search I imagine and is correct in a sense for factory tables and stock applications, however, when you change things that modify air flow in and out (along with other supporting mods) the PCM can only compensate for so much, that is when the custom tunning comes into play.
If it is worth anything to you, my MIL will turn on on occasion (giving me a lean code for bank 2). I know there are no vacuum leaks, much less over filled oil, exhaust leaks or failed/lazy 02 sensors (in fact, mine are quite active).
Running with it untuned may or may not result in a failed 02 sooner or later, but then again, many repair shops will recommend replacing them every 30-60k miles, depending on applications.
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Originally Posted by 12second5.0
I'm gonna have to double park my dick on her ass to make sure I get a turn.........
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Built 00 Windsor engine, .20 over, 11.6:1cr, fully ported heads, Hardballer intake w/cooling mod, Scat rods, Probe pistons, Cobra crank, tri-metal Clevite race bearings, VT Stage 2 N/A cams, adjustable cam gears, Canton windage tray, MMR oil pump, Cobra pick up, 75MM Accufab t-body, Dragon plenum, JLT CAI, 24# injectors, Bassani mid lengths, mufflers & O/R X,255lph fuel pump, BBK FPR, Fidanza aluminum flywheel, AJE K-member, ARP hardware everywhere, X-Cal SCT custom tuned, 3.73's, Pro 5.0, polygraphite motor mounts.
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