low noisy idle: help me test idle control valve
 

hi, I don't know if this also happens to you but at this point, my car is fine and runs well however when I stop either on "reverse" or "drive" like in stops or in long lines, the engine makes a loud noise that sounds like a stove boiling water because the RPM is around 600 approachng the level of a possible "stall." There are of course ways to alter the idle like for instance removing the short rubber hose that goes from the intake to the idle control valve, if I do this, the RPM gauge will go in "neutral" as far as 2200.

I suspect the idle control valve is bad, or I may have a leak despite I replaced many rubber and vacumm lines with newer ones from my parts car.

So, using a standard sears craftsman multmeter, what can I do?? maybe check for current in the wires???? or maybe testing the valve itself ???? thanks for any comments

uh, what year and engine. i guess you have a 190e. chuck.

oh yeah, 85' 190E 2.3 8v

I have an '88 idle control valve, I am thinking of testing it on my car but the wire connection is different :(

I may stand corrected, but I believe the idle control valve may be cleaned. If so, give that a shot first.

http://www.peachparts.com/shopforum/tech-help/76916-idle-control-valve-photo.html?highlight=idle+control+valve

get a valve for an 85, they are different spec. turn the car on, do not start it. go to the valve and grab it-does it vibrate? if yes, clean it and cross your fingers. if no, pull the connector and test for power and ground with a meter. 12v with key on, engine off. no voltage, pull the overvoltage relay and look at the date. if it's older than 8 years, replace it with the latest version available. good luck, chuck.