B16a swap problem

I just swapped a b16a1 into my 91 hatch si and everything is running good except when my engine gets to operating temp. the idle jumps from about 1300-800 rpms back and forth until I shut off my engine. Im not getting any ECU codes. I was told that it I might need to adjust my idle adj. screw, but im not sure if that will help. Please help!!
thanks everyone!

Check your idle screw first, if that doesnt fix it, unplug your EACV valve, and see if it stops. If it stops, your valve either needs to be replaced, or cleaned.

Its a pretty common problem on 1st gen B16s. The idle is just constanty going up and down. Mine did this for months. I've had it happen to me twice and both times it was the fast idle control valve.. Located directly under the TB.

screw all that and just go get it fixed proffesionaly not by yuorself your gonna have a lot of damage meesing wit that

Its a pretty common problem on 1st gen B16s. The idle is just constanty going up and down. Mine did this for months. I've had it happen to me twice and both times it was the fast idle control valve.. Located directly under the TB.

same thing happens with my b18a, i wonder if its just 0bd0 engines?

Its all honda motors. We had a 98 integra b20/vtec setup that did the same thing. His eacv was bad.

same thing happens with my b18a, i wonder if its just 0bd0 engines?

Yep, the FITV on the B18A is the exact same one as on the 1st gen B16s also. :) I think these valves are peices of shit.

But even a lot of the newer OBD equipped B series motors have simliar idle problems, but they don't have the fast idle valve, they have other problems like Kris mentioned.

Here's a good link for you!

http://www.honda-tech.com/zeropost?cmd=reply&id=7606123

i have sumthing similar to that problem but its oppisite when i first start my engine it will jump right to 2000 RPMs then it will jump down to around 100 RMPs when i get warm then it will start to jump from like 500 to 1200 RPMs its really pissing me off anyone have an idea the only code the ECU is throwing is the knock sensor but i kno i need to but a new one.....Thanks