Bouncing Idle? - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 03-11-2004, 09:55 PM
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So my car Idles correctly most of the time. Sometimes it has this bouncy idle, up down up down up down. Doesnt affect performance, just annoying. ghead What causes this, how do I fix it? Thnx in advance.

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#2 (permalink) Old 03-11-2004, 10:22 PM
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Take off your ICV and spray a crap load of WD-40 in it.
or if that doesnt work, check your o2 sensor. There are many others but thats all that immediatley pops to my head.

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#3 (permalink) Old 03-12-2004, 10:28 AM
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right on, it may be the O2 sensor, i been needing to get one... thanks

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#4 (permalink) Old 03-13-2004, 04:39 PM
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Quote:
Originally posted by Fox@Mar 11 2004, 11:02 PM
Take off your ICV and spray a crap load of WD-40 in it.
or if that doesnt work, check your o2 sensor. There are many others but thats all that immediatley pops to my head.
I have a similar problem... but how do I remove the ICV?? there are at least 2 hoses attached to it.
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#5 (permalink) Old 03-13-2004, 04:44 PM
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the hoses just pull off. Its not difficult at all. theres no liquid or anything in them so just give them a yank (after you loosen the clamps of coarse)

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#6 (permalink) Old 03-13-2004, 05:14 PM
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Quote:
Originally posted by Fox@Mar 13 2004, 05:24 PM
the hoses just pull off. Its not difficult at all. theres no liquid or anything in them so just give them a yank (after you loosen the clamps of coarse)
That easy, huh?

Okay, before I try this, is there any trick to putting the hoses back on? I'm guessing that it's a lot harder.

Also, how do I remove/loosen the rubber or plastic clamp (looks like a belt) over the middle of the ICV? I tried loking beneath it, but couldn't figure out how to take it off.
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#7 (permalink) Old 03-13-2004, 06:01 PM
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its either 1 of 2 types of clamps. its either the type that you unscrew and the band loosens or its just the type that is just bent together. Either way its easy to get off and just as easy to get on.

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#8 (permalink) Old 03-13-2004, 06:18 PM
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yeah it is pretty easy to get it out like they said, but you may need to replace it instead. mine was busted

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#9 (permalink) Old 03-13-2004, 06:33 PM
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What about the hoses? Before I take them off, I want to make sure they slide back on easily. Do I have to lube them before trying to put them back on? Or do they just slip on easily? thanks
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#10 (permalink) Old 03-13-2004, 06:37 PM
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they slip on pretty easy. Shouldnt have to lube them or anything

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#11 (permalink) Old 03-14-2004, 03:28 AM
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i have the exact same problem. the idle fluctuates, and if i let it idle long enough, it will eventually stall. i have an 83 320i (euro), and it doesn't have an O2 sensor or an ICV!! (at least according to the haynes manual i got) so what can be the problem??
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#12 (permalink) Old 03-14-2004, 11:15 AM
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yours is carborated then. (?)

Spray some carb cleaner through it.

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#13 (permalink) Old 03-14-2004, 03:48 PM
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WD-40 in the ICV worked like a wonder. thanks guys

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#14 (permalink) Old 03-14-2004, 08:09 PM
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Quote:
Originally posted by Fox@Mar 13 2004, 06:41 PM
its either 1 of 2 types of clamps. its either the type that you unscrew and the band loosens or its just the type that is just bent together. Either way its easy to get off and just as easy to get on.
I just looked under the hood again, and I'm having a had time taking off that belt/clamp around the middle of the ICV. It's a hard plastic strip that wraps around it, and the two ends of the strip come together and are held together by a couple of square-head screws(?). I don't know if they just pull off what what.

If I knew how to post my pics, I'd do it to show you what I mean. I just want to be able to remove my ICV. thanks
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#15 (permalink) Old 03-14-2004, 11:39 PM
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Quote:
Originally posted by Fox@Mar 14 2004, 11:55 AM
yours is carborated then. (?)

Spray some carb cleaner through it.
not carb. i have 320i, with m20b20 engine, L-jetronic, i think.. there's a picture of the ICV in the haynes manual, and when i looked at my engine, that ICV is not there!! and O2 sensors are only for motronic, i think.
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