Hmmm... the more you fix theis car the less it goes
Couple of things that need
to get sorted / made clear...
1. The AFM is the primary load sensor for the engine. It tells the ECU how much air
is going into the engine so that the ECU can calculate how much fuel to supply. It also
contains a switch actuated by the flapper to turn the fuel pump ON, so if the car is
upside down in a ditch and the engine stops, the fuel pump is no longer pumping fuel
onto a hot exhaust.
So at least in theory, if the AFM is unplugged, there is no circuit for the FC switch
and it is not possible for the engine to run. If it does run with the plug off, then I'd
say the wiring has been "creatively improved" to bypass the FC switch. Should this
be the case, then if the engine can be started with the plug off the default would
be RICH AS
because the ECU has no idea how much fuel it should be adding.
2. You mention that the ISCV appeared to be blocked off. This is a bad sign, as it
says that someone has fcuked with it because it was not working. And as the ISCV is
designed to be the only avenue for air to enter the engine when the throttles are
closed, it is very likely that the same person fcuked with the throttle stops and air
bypass trim screws. If so, you will have to test to see if the ISCV is actually working
now that you have cleaned it, and that the ECU can control the idle using the ISCV.
If the valve is working correctly, then you are gonna have to reset the bypass screws
for minimum air leakage and reset all the throttle stops so that the throttles all close
tight at idle. Means checking and re-setting the TPS as well. Simple check is to pull
the large hose off the outlet of the ISCV and close the end of the hose with your thumb.
If the engine stalls or drops very low and nearly stalls, then the throttles are not
leaking huge amounts of air. But if the engine just idles like normal, then idle air is
leaking past the throttles and not being controlled by the ISCV.
If you disconnect the large hose and don't block the end, the idle speed should shoot
up to something like 3000-4000 rpm
Might help to narrow things down a bit.