Please excuse this noob if this is a previously answered ?. I just recently bought a 1984 BMW 318i. I have a wierd idle problem. It was idiling fine for the test drive and was idiling fine that night i bought it. I woke up the next morning to find that it did not want idle. I would start it and it would jump between 1200 and 500 or 600rpm. Usually after a min. or two the engine stalls/dies. Dont know whats wrong. Starts up fine and pretty sure it drives fine(all gears too). Please Help!!!!!!!!!!!!!!!!!!!!!!!!!
Looked it over and I've found a few hoses that where either cracked or rotten. I also realized that the icv dosent have the wire connector or any wire going to the prongs on it. About 3wks. later the idle was about 3000-3500.. I got all vacumn hoses and replaced all but one that seemed to look alright. I also cleaned the ICV put it back on and started the car. Idle was still just as high. . Then I decided to put the frayed wires on the prongs of the ICV to simulate the connector being there. It dropped the idle to around 1100-1000. I talked to a dealer and I'm gonna try and match up a connector I can use.
Couldn't get an actual electrical connector but i did mange to find two seperate connectors that fit the prongs on the icv and crimped the wires to the connectors. Put the connectors on and the idle was right around where it was earlier(1000-1200). But then after it ran for short while it started to surge(between 1300-800). Put a few more hose clamps on hoses that didn't have any and to my suprise the idle stuck at 2000. It stayed like that for a solid 2min. Then again started to dropped till it hit 1100 and stayed there for 4-5mins.But then right back up to about 2000-1800. I plan on ordering the MAF boot, 1 more vac hose, and a fuel dampener i found leaking as it was running today. Anybody have any other ideas to as why the idle is high?????? I'm guessing a vacuum leak is no longer a possible problem since it's no longer surging idle.