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Old 06-30-2012, 01:25 AM   #1
Lusticles
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Sitting in my car; extremely rough idle

I'm waiting out the storm in my vehicle, and after sitting parked for about 10 minutes, contributing to the dying ozone layer, my idle dropped to a pinch above 500rpm and the car is shaking violently.
I've had a rough idle cold-start before but it was nothing like this.

If I press the gas and raise the rpm it will feel normal, but once I release the pedal and let the rpm drop to idle again I can hear the engine sputter a bit, almost dying, but then regains itself to a mere shaky stance with a low idle.


Ive read about the MAF regarding cold-starts but is that the same relating to a rough idle about 10 minutes into sitting in park after driving for about 45 minutes?

It was normal and felt so stable and smooth but then suddenly the entire car started shaking violently. It still is. I restarted it about 5 minutes ago (before I posted this) and it again started the violent shaking, but again not immediately.

It's like sitting in that earthquake again just no earthquake. Before the violent shaking it didn't even feel like the car was running.

I'm on my cell phone, powers out as far as I know, and I would like to pinpoint something specific as I live in a city and I am not trying to pull my car apart on a side street when I'm not sure what I'm looking for.
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Old 06-30-2012, 01:26 AM   #2
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That can be anything, man. See custom user title.
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Old 06-30-2012, 01:34 AM   #3
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Egh. I don't want to take it to a mechanic, but I also cdon't want to take a bunch of guesses and start replacing or cleaning things that are unrelated. It sucks even changing the oil on a side street.

I don't know man, the engine was seriously shaking the car in every direction.


Also, on a phone, not sure what the custom user title is
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Old 06-30-2012, 01:40 AM   #4
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I'm guessing no codes otherwise you would have mentioned it? Is it still shaking? just a one time thing? need more info to go by. when it does start shaking, does the shaking go away when you give it gas? your ICV and everything else in the car is probably effing with you.

My custom user title is "JFOJ or GTFO"

it basically means replace your entire vacuum system and clean anything that is idle-intake related.

I've JFOJ'd my ICV, TB, DISA and MAF three times in the last three-five months. Needless to say, my car idles beautifully.
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Old 06-30-2012, 01:42 AM   #5
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spark plugs, engine coils, and ICV is a good place to start. How many miles do you have? Is your check engine light on?
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Old 06-30-2012, 04:48 AM   #6
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Had the same problem in my old '05 325Ci, it was the crank case valve. Replaced that and it was back to normal.
Also did the idle control valve just in case. But I know what you mean - it would never shake after I started the car since the RPM would rise but once it leveled, it would vibrate up and down and you will be able to hear the exhaust going nuts.

I forgot what I replaced exactly but I know for certain it was a plastic part and it was idling like that because it was cracked and air was flowing irregularly.
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Old 06-30-2012, 10:01 AM   #7
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this is what happens when you dont heed PM advice and instead discuss and pay attention to mod/stance threads. op you've been on here enough to see JFOJ's advice, haven't you? more maintenance, less mods.

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Old 06-30-2012, 09:08 PM   #8
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when you first cold start. take the expansion tank cap off and see if coolant gushes AKA small guiser out the top. if so then its headgasket time
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Old 06-30-2012, 09:40 PM   #9
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Jesus, how can we go from an occasion rough idle to a head gasket??

Deal with the basics and simple things first.

As Mango mentioned, start by reading the first link below in my signature.

Could be something pretty basic, could be a bit tougher to find.

Time to also consider fuel delivery as well, but that is touched upon in the link as well.

MAF would not be high on the radar initially.

Good luck.
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Old 06-30-2012, 09:41 PM   #10
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when you first cold start. take the expansion tank cap off and see if coolant gushes AKA small guiser out the top. if so then its headgasket time
Really?
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Old 06-30-2012, 09:44 PM   #11
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Quote:
Originally Posted by swaggerwagon View Post
when you first cold start. take the expansion tank cap off and see if coolant gushes AKA small guiser out the top. if so then its headgasket time
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Old 06-30-2012, 10:37 PM   #12
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when you first cold start. take the expansion tank cap off and see if coolant gushes AKA small guiser out the top. if so then its headgasket time
Really?
This is news to me
Jury is still out on this though.

Lusticles.. I had the same problem, I cleaned my ICV and that cleared up a lot of my problem. When I get my CCV done, that will hopefully smooth everything out the rest of the way.
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Old 06-30-2012, 10:48 PM   #13
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Old 07-05-2012, 06:48 PM   #14
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happened to mine...real rough idle on cold start, perpetually low coolant, and puff of white smoke on start up. pulled head after cap off test and pressure tested cooling system, found small break in headgasket.
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Old 07-05-2012, 10:20 PM   #15
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Congratulations. Sounds like you may need a new ccv. Welcome to the club. Sounds familiar to me.
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Old 07-19-2012, 04:35 AM   #16
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i had the same issue when a/c was off, idle went down to around 500 and felt like the engine was about to shut down. went to dealer and got the idle RPM tune similar to with a/c on - problem solved. there must be setting you can work with to have proper idle RPM otherwise my mechanic wont able to do it. anyone know the coding for setting the idle RPM?
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Old 07-19-2012, 04:50 AM   #17
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I think the computer knows to idle at 700 rpm...if it's not holding that, I'd agree it could be many things. Any of the things mentioned it could be (icv, stuck tb, intake leak, bad maf, etc.). You didn't say you got codes, so I'd say a trip to autozone for free code reading...which might get you closer.

I actually also first thought the OPs issue sounded like 'low fuel' (nothing personal!)...and if it's shaking badly, then whatever is causing the shaking might also seem worse because motor/trans. mounts are on their way south...but that's just another guess!

Play the odds, OP...begin with the simple things that should have been done but which haven't been yet...then go hunting for other things. My money is on some combination of dirty icv/tb and a small intake leak (which is probably the lower intake boot, but which could be many, many things).

Let us know how you make out!
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Old 07-19-2012, 05:24 AM   #18
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I had a similar issue for 3 years on my 01' 330ci. I had the 500rpm idle, and started experiencing rough starts, and even 2 no starts/extra long cranking starts. I changed the fuel filter a few months ago, and all of my idle issues and hard starts went away. So, if your fuel filter is old, or as in my case original (@122k miles), then you know you need to change it anyway, so take a chance on a quick and easy fix. I only changed it because it was original, and I started having the hard starts, but I was lucky, and it cured all of my idle issues as well.
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