Emissions device logic in stock Mustang ECU
So here's a rarely asked question. I am planning an MS3 install in the near future. Now, my EGR will get deleted, but i intend to run cats and may keep my smog pump.
Now, before i can figure out how to control it, i want to understand the parameters in which is operates on the stock setup. In general, i know that during warmup, the air pump diverts air to the heads to the top pair of cats, and after warmup, diverts to the main pair of cats. Since i'll ultimately be running a high flow pipe with 2 cats, it doesn't make sense to feel air to the heads, so i'll plumb directly to the h-pipe. However, it appears that flow can be stopped completely. Under what circumstances would the ecu close the bypass valve and block all flow from the air pump?
Second question revolves around charcoal canister and EVAP purge. I know i can just vent it, but if i choose to keep it intact, under what circumstances does the factory ECU close/open the purge valve on the system?
--1988 Mustang LX 5.0--