Hello Tegger,
Thank you for reading my post.
90 Accord Ex Canadian. Automatic.
Fast Idle 1100-1200 rpm, no fluctuation.
Warm idle 850 rpm holding steady,no fluctuation.
The fast idle speed is too slow, it will be a problem for me when it
is -30C. After the car warm up, I took off the air intake duct. At the
Throttle body,there are 2 ports. One at 10 o'clock position (upper
port) and one at 7 o'clock position (lower port ). Suction were felt
on both ports. When I unplugged the EACV , no suction was felt on the
lower port. the engine kind of stall and run at about 500-600 rpm. I
did some reading on the net and people says the upper port is the FITV
port and it should not be sucking air in when the engine is fully
warmed up, that was why I thought may be the FITV was leaking and
proceed to tighten the plastic ring. The FITV on my car has 2 heater
hose connected to it, one coming from the EACV. As I open up the FITV
which has a cover held by 2 screws,  the plastic ring was quite tight
(I actually was not able to tighten it any further ) and when I
checked the suction again on the upper port with the cover still off,
there was no suction, put the cover of the FITV back on loosely, and
there was suction again at the upper port. The puzzling part was the
cover of the FITV shouldn't play a role. And I have checked the FITV
in boiling hot water, the pin moves up compressing the spring. I
should have strong suction when cold and no suction when hot, right?
Thanks again
Crw