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Does using tow/haul mode alter use of PE mode?
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No, tow/haul mode has no direct effect on PE mode.
It's all tied to pedal position on these particular engines.
In the stock Ford engine calibrations, PE does not come on until your foot has physically pushed the pedal down past 90% for a full, uninterrupted 60 seconds. (Sorry to yell, I just wanted everyone to fully understand exactly how it works. lol.)
This is a really big deal because if an engine doesn't get proper power enrichment it runs dangerously lean, creates excessive heat, is FAR more apt to knock or ping and of course won't make the power it's capable of. The fact that Ford tied PE to pedal position is pretty crazy. Most every other OEM has it tied to actual engine loads, throttle position or a combination of both pedal and tps inputs. Having it tied to pedal position makes the way some aftermarket companies modify those engine calibrations even more inefficient. Like I said earlier, if you tune the engine so that the throttle goes wide open when your foot is only half way to the floor, the engine will NEVER see PE in those situations. You can show power increases in a dyno chart, but when the customers are actually driving, you've actually REDUCED the power from stock levels by basically disabling PE. Scary stuff.
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