325es surging in cold weather - BMW Forum

whitey_E30 · 10-21-2006, 08:38 AM

i have a 1986 325es. right now it doesnt idle smooth. it revs from about 600 to 1200 rpm while its in park and running. my old 1987 325is did it too. but just recently, the has started to do it going down the road before it warms up. unless i put the pedal to the floor, the motor barely revs up at all. after about 10 mins of driving it works fine. it also seems to shift fairly hard during this time too. cars a automatic.

from a stop, i pushed the pedal in a quarter of the way and the car runs great. once i get around 20 mph and pedal halfway, it just quits reving up and almost like it stalls. but if i put the pedal to the floor the car launches off great. thought maybe it was transmission but that wouldnt keep the motor from reving up.

Starmavin · 10-21-2006, 08:58 AM

Check your temp sensor first. (actually just change it for good measure, they go for 19 bucks and can be found local)

whitey_E30 · 10-28-2006, 06:58 AM

found that it was the idle stablizer. expensive a** part too but i dont really have a choice. how hard is it to install???

Starmavin · 10-28-2006, 11:07 AM

The idle control motor is easy to change. If your car is an 86 it'll be on the back of the intake plenum above the valve cover. It'll be about 5 inches long X 2 inches cylinder shaped with two hoses going to it and a 2 terminal plug. With a flat head screwdriver for the two hose clamps, it'll take 5 min tops. I got mine from autozone for less than 150.