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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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Old 05-25-2008, 05:10 PM   #1 (permalink)
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I Got Big Problems Now Help!!

okay i messed up big time. tried resetting oil service light. done this many times in "90 525I with no problems. now I do it on "85 325E and It does not work. probably because of something related to battery replacement. anyhow im over that. but i actually realized i shorted some other pins like probably all of them!! im furious at myself. and now today i started the car to go for a ride to the car wash. and bam!!!! the car starts reves high to 2-3K RPM and stays there awhile, kinda like warm up symptoms. only that should be like 1500 RPM. and temperature gauge is off, its reading low by a whole 1/4..
when the car finally gets out of "warm up stage" it starts to "Breath". like someone is reving it up and letting it go and constantly doing that on time. i dont now how to get it back to normal. im probably going to send to mechanic but i want to know what to expect. car runs and drives, it just consistently revs and is off!!!

its 15 pin diagnosis.
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Old 05-25-2008, 06:37 PM   #2 (permalink)
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I'm sure there is a short, but it's only guess work as to what exactly.
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Old 05-25-2008, 09:59 PM   #3 (permalink)
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well I fixed half the problem I think my temperature gauge is reading again. and now its almost at a good idle. it just keeps reving up and then goes back down. like someone is gassing it. im sure i short something but what? and what would do that? i mean the car starts and shuts off with no problem. ignition is going good. is it the alternator short that is causing that. or an ignition short. possibly a POSITION SENDER + - <<dont know what that refers too though. nothing else could have cause these symptoms of a bad running off engine. only other thing i can think of is its a coincidence and its not related. timing belt is less than 2k miles old.
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Old 05-26-2008, 01:48 AM   #4 (permalink)
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ICV? pull it and clean it... that is a common issue...
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Old 05-26-2008, 05:38 PM   #5 (permalink)
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ok ill try that. only thing is i dont know which component it is. is there a picture or a thread on it. my 85" 325e is probably like your 86. is it tucked under the intake manifold or on the right side of the engine bay. ill take a picture of my engine bay if need be.
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Old 05-26-2008, 09:59 PM   #6 (permalink)
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just a hunch... did u remember to put back the diagnostic port cover?.. as in, "correctly" the cover does have jumpers as well u know...
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Old 05-26-2008, 11:03 PM   #7 (permalink)
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actually mine did not have a cover when i got it. someone must have lost it. but what terminals would the jumpers use when the cover is on. i can try and replicate it. i just dont see how it was running good without it. and now its an issue. but maybe.
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Old 05-26-2008, 11:16 PM   #8 (permalink)
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recycle shops should have them for cheap....

anywayz... if it was running fine before, then that is maybe not the issue. next line of suspect will be leaks in your intake. Easy diagnostic is to get a can of brake cleaner.... bring your car to IDLE and spray the AFM, the rubber boot between air filter and everywhere else that you might have touched in your repair.

In any case, the IDLE will drop as soon as the leak senses the brake cleaner... and you can do the necessary repairs from there

Last edited by darkhorse737; 05-26-2008 at 11:20 PM. Reason: additional infor that might help:
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Old 05-26-2008, 11:23 PM   #9 (permalink)
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since it is electric that u are dealing with. try this before you do anything else:
DISCONNECT YOUR BATTERY AND LET YOUR CAR SIT ALONE WITHOUT POWER FOR AWHILE. A FEW HOURS/OVERNIGHT. THIS WAY, IT ALLOWS YOUR COMPUTER TO RESET TO ZERO & ALL SENSORS/RELAYS ARE RESET TO THEIR ORIGINAL POSITIONS.

RECONNECT YOUR BATTERY(TAKE NOTE OF YOUR POLARITY) AND RE-START. THAT JUST MIGHT DO THE TRICK FOR YOU. GOOD LUCK
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Old 05-27-2008, 02:25 AM   #10 (permalink)
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ya I did disconnect it and re connected it and the temp gauge started working again. just not the IDLE. I will try and leave it over night see what that may do. if anything ill check the intake control valve. I did not find any leaks in the hoses. plus idle is high leaks would cause it to be low I would assume.
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Old 05-27-2008, 09:28 AM   #11 (permalink)
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nope. intake leaks can give you a high idle, or a rough low idle. depending on the "tune" of your engine
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Old 05-27-2008, 11:50 AM   #12 (permalink)
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ok thanks for the heads up. I was doing some checking up this morning and I disconnected this electrical connector its a small two terminal or prong plug. and it goes into a female receptor that is right under the intake manifold. so i disconnected it. and the idle went even further up and stayed at about 3000 RPM's. with it connected its idle is at about 1300RPM the weirdest thing is its erratic, it revs up and then starves it self and then revs up and continues. and actually that behavior is on time! i tried IVC seems fine. i pulled it and put it back on. the electrics is what has me thinking. thanks for all the ideas and help. Does anyone know what that electric piece is. Its raining right now or i would take a picture.
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Old 05-27-2008, 03:00 PM   #13 (permalink)
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that is your ICV (i hope you can see the attachment)... earlier models have 2 prongs, later models have 3 prongs
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Old 05-27-2008, 04:46 PM   #14 (permalink)
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its a weird thing that could have happened but anything is possible there is a litte like screw type thing on the top of the engine i think is either under or next to the throttle control and you can try unscrewing or screwing it to get you idle right oh and buy the way if anyone reading knows what an 86 325e is suppose to idle at could you let me no mine is idling at 750
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Old 05-27-2008, 07:19 PM   #15 (permalink)
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Originally Posted by bimmerpat90 View Post
its a weird thing that could have happened but anything is possible there is a litte like screw type thing on the top of the engine i think is either under or next to the throttle control and you can try unscrewing or screwing it to get you idle right oh and buy the way if anyone reading knows what an 86 325e is suppose to idle at could you let me no mine is idling at 750
nominal speed for E30 is 700rpm +/- 50rpm. u are fine ;-)
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