1992 940 irregular idle and revs between 1500 to 2400 rpms s

housefam · Post by **housefam** » 26 Oct 2005, 08:55

new to forum: i have a 1992 940 non-turbo. it has idled rough at times but runs well with just a hint of a miss. now if you revv it up in park or neutral it stays around 1500 rpms and does'nt idle down and revs up to 2400 rpms then back to 1500 then up to 2400 etc. does anyone know what is happening ?????????

Guest · Post by **Guest** » 09 Nov 2005, 16:27

stuck throttle? idle air control?

wojeepster · Post by **wojeepster** » 15 Nov 2005, 18:14

With engine off open and gently close the throttle by hand. When it closes you should hear a small click. This is a small switch to tell the ecu to use the idle air control to regulate the idle. If you hear/feel the click then your throttle position sensor is doing its job and your idle air control is probably clogged and needs to be cleaned. There is one electrical connection (press metal wire clip and unplug) and two hoses attached to it. Once you have it off you can gently clean it (carb cleaner) lubricate it and put it back on.