How do you change the fast idle sensor valve on a 1991 Honda Accord EX?
well the fast idle thermo valve ,is on the top of the motor right on the intake manifold,it has two screws on the top, let engine warm up , take the screws out. put finger over and gently push ,with engine running. If no air flow replace valve,or unscrew the plastic top of valve, and with sand paper placed face up on a flat surface sand down bottom of valve. This will let the heat reactive part of the valve shut of sooner blocking the excess air from entering the intake manifold and raising idle.
1) Unplug the electrical connector for the EGR valve lift sensor. 2) Remove the two nuts that secure the EGR valve and detach the valve. 3) Clean the mating surfaces of the EGR valve and adapter. 4) Install the EGR valve using a new gasket. Tighten the nuts securely. 5) Plug in the electrical connector. These instructions come from the Haynes repair manual for Honda Accord 1990-1993 which also has good illustrations.
Right ontop of the starer. you can remove and clean but you probably are going to have to remove intake manifold and clean all the carbon. check engine on my 2000 Honda accord v6 came on. codes read not enough air flow, change egr valve. removed and it really wasnt dirty. Honda tech adviced to clean intake manifold. problem fixed.