94DC17

I need some help please.. I replaced the idle air control sensor and my idle still goes up and down from around 1500 to about 3000RPM's. I dont know what else it could be, some one told me it could be TPS or vacuum line but i dont know.. so please help me out.


thank you

St Jimmy

You have a vaccum leak or bad ground.

LordAphotic

did you recently replace the intake manifold ?

94DC17

I haven't replaced the intake manifold and what kind of ground would i be looking at?

Also how would i check for leaks?

thank you,

hard charging 929

air leaks from the throttle body or intake manifold gasket or any of the air lines running off the intake mani. wil cause a vacuum leak.
What year is your car and have you reset your ecu lately. If you have or if your battery went dead or I believe just over time you need to adjust your idle. If you idle is set too high it will cause a surge. You can try to lower it down and see what it does. There's a screw on the throttle body, use a flat blade screwdriver and turn it. You'll hear the engines rpm's lowering or rising, try and lower it down to I wanna say stock is 750 rpm +/-50 rpms. See if it's a simple idle adjustment or if it's something else. Also, you want to check your fast idle valve. Look in some of the FAQ threads for write ups and more info.
Hope it helps

94DC17

I checked most of the gaskets and they weren't leaking. I also checked all the lines to see if they were plugged in and they were. I'm reseting the ECU to see if that will do anything.

94DC17

i took off my fast idle control valve and i don't know if it is supposed to move around in there can anyone let me know thanks..

hard charging 929

https://honda-tech.com/zerothread?id=699787