High Erratic Idle Problem.
OK I have a 93 MX6 2.0L (4 cycl) and the idle will start high at 2000 rpm upon starting and when the cooiing fans kick in it bounces between 1200-1800 rpm.
Occasionally after a stop i.e. engine still warm, I would restart and it would run right (makes me think it;s not a vacuum leak). I've checked for vacuum leaks and found none. I cleaned the IAC as well. So when the car is doing the idle bounce, and the cooling fans are off, I can disconnect the MAF and it will go to a steady high idle (1800 rpms). When the cooling fans come on disconnecting the MAF has no effect and the idle keeps bouncing. Alternatively if I dissconect the IAC the bouncing idle becomes steady whether the cooling fans are on or off. The car is throwing no IBD I code? The MAF has a 3 pronged plug leads (Left-middle-right ) and if I take a volt meter between the left and right leads MAF leads I get a resistance of 4.5Vs. The resistance doesn't change if the car is running or not. Am I measuring the MAF resistance properly? Is this a sign the MAF is bad ; or would the high idle mess up the ohm reading when running?