shaners90lxhatch

IAT inaccuracies will NOT force open loop operation. Even if the PCM thinks it is below freezing all the time. You shouldn't need PCM cal numbers unless the part had at one point been updated. I would have to have a specific example to specify. You are in open loop drive under WOT so disconnecting your oxygen sensors won't help you under those conditions. There is no point in forcing your vehicle into open loop for performance reasons.

Joel5.0

The reason is Adaptive Strategy corrections.......

shaners90lxhatch

What? The only way to reset these corrections is to reprogram the PCM or clear KAM. The strategies are continuously adjusted during Closed Loop driving only. Open Loop operation is when the PCM just gives up and runs off the base table. There are situations like Open Loop Drive like under WOT, if you have a cat over temp condition, KOER self test, OBDII monitor initiation, that sort of thing. Open Loop Fault is what you go into when you disconnect your oxygen sensors. Closed Loop fault will happen if you only disconnect one of your oxygen sensors becuase the PCM then uses the feedback from the working sensor to fuel both banks.

92hatchLX

Don't get me started on ball joints in powerstrokes! Why are there 4 different fuel pumps for one 2001 f250 V10, it's bull****.

5IVE.OH

because ford engineers have nothing better to do then make up different pumps based on wheel base.