I noticed that my 88 legend had been always runing high idle (1000 rpm to 1500 rpm) when it got started first in the morning or parked for a whille. With the weather is getting cold, the idle seems getting higher. I saw around 2000 rpm last couple of morning. Anyone has same experience? Does Legend need long warm up? How to tune down the idle speed?
yup, thats right ken, i wouldnt recomend touching that idle adjustment screw unless you replace the IAC or the throttle body. Its pre-set at the factory to work within limits the IAC can maintain a correct idle. In other words, if you turn it too low, at certain temps it wont idle correct while at the cold temps you describe it will idle fine. I would just let the car warm up for about 5 minutes in the morning. I have noticed if i let mine warm up just that long she runs fine and heats up to about 1/4 gauge within 1-3 miles.