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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 10-04-2009, 08:01 PM   #1 (permalink)
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Arrow New Member - Need '84 325 Idle Help

Hello all, I'm new here and currently have an idle problem with my car. Like the title states, it is a '84 325. When it starts, the rpm goes up to +/-3k and then comes back down after about 2sec. Then it revs up and down between +/-1k and 2k while parked.. I'm sure it's probably just a sensor, but I'm not sure.. And input/suggestions would be greatly appreciated! Thanks!

-Matt
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Old 10-05-2009, 01:45 AM   #2 (permalink)
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Check your idle control valve. Its the little silver thing on the top of the intake manifold. They go out all time. Usually because they suck up junk from the engine. Give it a good cleaning and see if that helps.

http://www.pelicanparts.com/BMW/cata...uxairvalve.jpg
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Old 10-05-2009, 03:12 AM   #3 (permalink)
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Sounds like the Air flow meter to me.....
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Old 10-05-2009, 11:27 AM   #4 (permalink)
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Thanks for the responses! I'll defiantly give both ideas a good looking into!
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Old 10-05-2009, 11:32 AM   #5 (permalink)
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If you unplug the air flow meter with it running and there's no difference or it dies or revs right up, thats the problem and will need to be replaced and if it is dont by a cheap one from ebay, Bosch or siemens is the way to go....pref Bosch
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Old 10-05-2009, 03:17 PM   #6 (permalink)
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Tried idle control valve and didn't do anything different so I swapped one I know works and still did the same revving.. Where is the air flow meter? I'm new to working on bimmers although I know just about everything about motorcycles
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Old 10-06-2009, 02:40 AM   #7 (permalink)
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It will be situated twix your air box and air intake,looks like this:

BMW E30 Mass Air Flow Meter AFM MAF 325is 325ix M20:eBay Motors (item 220484409581 end time Oct-22-09 13:35:05 PDT)

I presume you have an E30
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Old 10-06-2009, 07:00 PM   #8 (permalink)
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Correct on the E30. So if it's running and I unplug the air flow meter and it dies, that means?..
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Old 10-07-2009, 09:12 AM   #9 (permalink)
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please see post #5
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Old 10-07-2009, 07:29 PM   #10 (permalink)
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Ooh sorry I misread post 5. Thanks for your help! I'll see if that cures my problem!
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Old 10-07-2009, 09:24 PM   #11 (permalink)
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no, you guys are missing something. On every 325 anything it was Motronics.
with Motronics there is an idle control valve, but there is also a partner control unit for said valve. this control unit is the size of a pack of smokes and sits on top of the main control unit, which resides in the attic of your
glove compartment. check it out....fact is, the idle control valve is run by
this little controller...typically you need to replace the electronic control unit and clean the actual mechanical valve out with Gum-Out or something until you can actually blow through it like a straw and hear the valve work...sometimes you have to replace both as they can burn each other out.
I had a 533i that this very same thing happened too....
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