My RPM revs up & down!!94 Accord
 

I have a 94 Accord Ex with a 96 engine and I have been having a problem with the engines RPM going up and down I tried cleaning the Throttle body and the fast idle thermo (FIT) I've changed my idle air control (IAC),Intake air temperture (IAT) now I have come to a dead end, has any body had this problem before that can give me some advice. ANY HELP WOULD BE APPRECIATED

THANK U

idle set to high or vacuum leak.

with everything you've already done, I'd think its a vacuum leak.

or a blown head gasket

How would I find out if it is a vacuum leak? and if my head casket is blown wont i have a over heating problems or would it just do what it is doing. the car is fine other than the up and down problem I am not pulling any codes at all but I have unplugged the EGR and I am not getting any codes ether, or am I suppose to?:confused: ; need help bad!!!!!

i've had the same problem with my car...after driving a while the rpm go up and down...i change my temp gasket and it was fine after that...try that i bet it's stuck on open like mine was....peace

oh yeah does ur temp gauge after a while of driving go down to cold or near it??

checked your 02 sensor lately? replace and see what happens.

where would I find mt temp gasket? my temperture gague reads find. I am on my way to pep boys now to get an o2 sensor.

temp gasket is on the left side of the engine block to the rear, it's very close to ur inlet to ur throttle body, follow ur outlet pipe thats from ur radiator to it...that's what i did, took me a while to install, well like an hour, cause i could unscrew the lower bold without taking some parts off....if u still need help i'll take a pic for ya....peace

I've had this same problem before, just had to replace my idle valve.