11-21-2019, 01:02 AM
i have used clay to block the IAC input port, put back the air horn so MAF is working
then start the engine, it may take right foot action to keep cold engine running with Dead IAC>
but what the engine does now tells you if the IAC is bad, or there is this other leak. of air.
The IAC closes 100% hot, and must, if someone tuned duty cycle to 50% with the bleed screw and there are leaks, then when the engine is cold the air leaks add to the IAC normal flow.
my point here is sometimes, folks adjust the bleed and used that to hide air leaks, hot. by screwing the bleed screw in 100% CW clock wise turned.
see? Duty cycle is set on hot engine only, using bleed so the ISC is in the middle of its dynamic rage, and done only if no illegal air leaks are present.
if the bleed is bottomed out, that is a RED FLAG.
then start the engine, it may take right foot action to keep cold engine running with Dead IAC>
but what the engine does now tells you if the IAC is bad, or there is this other leak. of air.
The IAC closes 100% hot, and must, if someone tuned duty cycle to 50% with the bleed screw and there are leaks, then when the engine is cold the air leaks add to the IAC normal flow.
my point here is sometimes, folks adjust the bleed and used that to hide air leaks, hot. by screwing the bleed screw in 100% CW clock wise turned.
see? Duty cycle is set on hot engine only, using bleed so the ISC is in the middle of its dynamic rage, and done only if no illegal air leaks are present.
if the bleed is bottomed out, that is a RED FLAG.
http://www.fixkick.com