3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
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I have a 1985 318i with an m10. When i bought the car for 600$ it had an idling problem like it had a vacuum leak or something. But about a month ago I replaced all of the hoses and checked everywhere for leaks. None, and still idled rough. Then I cleaned out the Idle Air stabilizer valve and the coolant temp switch and it stopped idling rough, but it idled really high, like 1500 rpm high. then yesterday it just started idling like it used to. Does anyone know what the most probable cause for this is? 02 sensor maybe?
dont know if it applies to your specific car, but i once read that on some of the e30's after you disconnect the battery the ecu has to re-learn how the car idles which takes something like 10-15 starts up. Just a thought..
you said you checked/replaced all the hoses bt did you check the pcv valve?? (if it even has one ) also the injectors may need a clean-up, and idk if those cars have a mass air flow sensor if so the you might want to clean that also.
PCV?
and i did clean out the mass air flow meter.
I went to the junk yard and got some good looking o rings for the injectors.
id like to take them out and clean them and replace the rings.
if i pull off the fuel rail i assume that im going to soill some gas, should i do it when my gas is low or something to prevent leaking or...?
as long as you pull the injectors off without the key in the run position then you should be fine only minimal leaking will occur... and the pcv is positive crankcase ventilation its a valve thats hooked up to the valve cover (usually) and it controls vacuum coming in and out of the crankcase, like i said tho not all cars have it
im pretty sure mine doesnt have a PCV. Ive isolated the problem though, it has something to do with the throttle switch. i think its the wires/connector that goes into it, or even possibly the the ecu itself, but idk. its so effin hard to get to the terminals to test them!
thank you tim96 and theluis.
I appreciate the help.
btw nice e36 theluis
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) also the injectors may need a clean-up, and idk if those cars have a mass air flow sensor if so the you might want to clean that also. 
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