RemeF22A1

I have a 93 10th Ann edition with the f22a1 4spd auto when cold in park or nutural idle drops a lil and up and down up and down after its been drove and warms it up goes away most of the time when in gear it idles round 1500 to a 1000 rpms when idle problem is happing no check engine light is on and ive checked all throttle hoses around intake and a few others not sure just hate it doing it any ideas what could be the problem? Also 4th gear around 70 my rpms move from 2850 give or take to 3150 could silenoids be that problem?

dglassmyer

Idle fluctuations are most commonly caused by FITV, IACV, or an improperly bled coolant system.
Refer to this link.
https://honda-tech.com/forums/showth...ight=iacv+fitv

To remove air from your coolant system run the car on a level surface with the radiator cap removed until the fans cycle on and off several times.
Keep the radiator topped off with coolant while doing this.

On the 5th gens there is also a coolant bleed valve on the thermostat housing to help speed up this procedure, I believe it is on the 4th gens as well but I'm not for certain.