What sensors does the compuer use at WOT.

jimberg · 10-30-2001, 04:08 PM

The computer uses the MAF, BAP, ECT and ACT sensors at WOT. The O2 sensors are active but only for the purpose of detecting a dangerously lean condition. They aren't used for adjusting the air/fuel ratio since the computer is trying to maintain a richer a/f ratio than the O2 sensors can measure.

The fuel map is based on a separate lookup table for WOT, but those numbers are adjusted according to numbers calculated during closed-loop control.

When the computer is reset, it will use some preprogrammed numbers based on RPMs and the amount of air being measured. It will use feedback from the O2 sensors to adjust those numbers. It stores these numbers in an adaptive strategey table in terms of an adjustment factor. If more fuel is needed, it's greater than 1. If less fuel is needed it's less than 1. That's basically close-loop mode. At WOT (open-loop control), those adjustment factors are multiplied by what the computer looks up.

What's the problem with your car?

------------------
351W 89 Mustang GT Convertible

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode	Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New O2 sensors ?	Mustang_289	Windsor Power	0	12-16-2001 08:06 AM
Problems with O2 Sensors on an Off Road X?	Chipdog	Windsor Power	4	09-24-2001 09:30 AM
Four Oxygen Sensors?!	cad614	Windsor Power	12	09-19-2001 01:08 PM
Need help with O2 Sensors on 95 GT	Mike Souslin	Windsor Power	9	07-31-2001 09:07 PM
New O2 Sensors: Which to buy?	Gautam	Windsor Power	4	02-02-2001 02:29 AM

10-30-2001, 04:08 PM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	The computer uses the MAF, BAP, ECT and ACT sensors at WOT. The O2 sensors are active but only for the purpose of detecting a dangerously lean condition. They aren't used for adjusting the air/fuel ratio since the computer is trying to maintain a richer a/f ratio than the O2 sensors can measure. The fuel map is based on a separate lookup table for WOT, but those numbers are adjusted according to numbers calculated during closed-loop control. When the computer is reset, it will use some preprogrammed numbers based on RPMs and the amount of air being measured. It will use feedback from the O2 sensors to adjust those numbers. It stores these numbers in an adaptive strategey table in terms of an adjustment factor. If more fuel is needed, it's greater than 1. If less fuel is needed it's less than 1. That's basically close-loop mode. At WOT (open-loop control), those adjustment factors are multiplied by what the computer looks up. What's the problem with your car? ------------------ 351W 89 Mustang GT Convertible