I know on my tbird it switches at 3000 rpms, causing a good 5 mpg drop at around 80 mph. Im just wondering if theres a similar thing on the shadow. Also wondering if theres a certain amount of throttle that triggers it, as well as boost pressure.
Im basically trying to figure out the most fuel efficient way to drive the car right now, and to accelerate in the engines efficiency range and avoid accelerating like grandma.
sounds like an interesting thing to do, would like to get some info on that too! doesnt it just switch to open loop under WOT only?
anyway, is there any kind of easy ALDL/OBD stuff you can scan these cars with? I'm comparatively new to these TDs, but on the 3gen F-body you can just hook up a cable to your laptop and check if it's in open or not (sorry, dont beat me for the F )
that's exactely what i already knew from the chevy small-blocks.
but, as bhazard already stated, some may also open at a specific rpm, and on our vehicles, maybe on a specific boost rate?
isn't proper temperature like the cts and o2 actually CLOSING the loop?
till the o2 heats up to 600°F it doesn't even give useable information imho!
normal operation = closed loop, right? so it's only opened when you just did a cold-start and monitor devices have to warm up to function properly
5-7psi also puts you into open loop. It's easy, get a cheap a/f gauge and you'll be able to tell when you're in closed or open loop. Our computers are much more sophistcated than the Ford crap of the same era. RPM's have no effect in what loop you're in.
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