Originally Posted by Kirk1589
I know what it is. LOL idc about the delay or whatevr in the throttle I have a cable attached to mine and not a dumb wire
I miss that cable sometimes. So little to go wrong and so cheap to fix if something does.
Nah I was talking about the logic programmed into the 4.0L engine vs the 2.7L engine. Even though they're both throttle by wire, there's a massive difference in when the fuel cut kicks in.
With the 4.0L (manual), the engine has to be spinning at least 1600 rpm in gear when throttle is lifted which often necessitates downshifting to trigger it; the throttle plate closes immediately, but for about two seconds it's still giving fuel and not much happens in the way of engine braking then. After that two seconds the loop indicator goes open, the truck lurches, and it slows down. It starts the fuel again at 1200 rpm.
With the 2.7L, it's so much more simple. Anything between 1000 rpm and some point between 2000-2500 rpm (haven't nailed down its exact spot yet) engages the fuel cut if the throttle plate is closed and there is no delay. I've run into the upper cutoff coming off the highway - no DFCO until sometime on the off-ramp.