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08-30-2011, 12:57 PM | #1 |
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RPM bouncing between 400-1k on cold start..ISSUES?
this morning on a cold start, i fire it up, and immediately drive off...about 100 feet away, there's a gate i have to stop at to wait for it to open on my driveway and while stopped and waiting for it to open, i noticed that my car felt like it was going to stall and die...the rpm bounced up and down pretty violently from 400 RPM to 1k...car is DCT with 10k miles on it.
ever since the car was brand new, i did notice a slight quick dip in the rpm after about 1 min on a cold start BUT the dip is very quick and comes right back up and only happens ONCE...the only difference this morning is that the rpm needle began to fluctuate a few times before the 1k engine speed was sustained...No faults were thrown...will this prove to become a major issue? anyone have any ideas? i tried to search but couldnt find anything really conclusive...i drove the car around for a few blocks and couldnt reproduce it...just kinda felt normal. |
08-30-2011, 01:00 PM | #2 |
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I am pretty positive its the ICV or "Idle Control Valve".
It's a fairly common problem and should be replaced under warranty no questions asked.
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08-30-2011, 01:02 PM | #3 | |
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is there any way to reproduce this or you just open it up and see that its defective?thx |
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08-30-2011, 01:12 PM | #4 | |
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Maybe they will request to keep the car overnight so they can replicated the issue in the morning. Maybe just wait till it happens more often and then go to the dealer.
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08-30-2011, 02:11 PM | #6 |
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Someone else just complained about a similar fluctuating idle on cold start. His dealer apparently replaced the VANOS. A properly running car won't do this. It will cold start at a higher idle and then taper down to stock. The time and rpm depend on the cold. There should be no significant fluctuation in idle rpm. The car will sound a little mean and rough for 30 seconds on cold start because the air pump is turned on for emissions.
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08-30-2011, 02:19 PM | #7 |
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well..just spoke to a couple SAs...from my description to them it seems normal and they are willing to take a look at the car but nothing will be done unless it throws a fault...if i insist, one dealer said they will open up a puma case for it but im pretty sure my car would be sitting for days, if not weeks...so ill just keep an eye out and drive it till it goes into limp mode to get the code...will update here
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08-30-2011, 07:30 PM | #8 |
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My advisor said the same so I'm waiting as well but still not showing any codes it's been a month.... Even drive my car hard and it made my car run better...lol
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12-07-2011, 10:36 PM | #9 |
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Hi, I have just started to notice this on my car also. I have about 24k miles on my car. Happened 2 x the last couple of months when it's really cold and I left the car outside for the whole day. If I start driving off right away (like 10-15 seconds after start up), at the first stop sign that I get to, the idle would jump between 500-800. Never feel like it wants to stall and will go away if I just let it do that for maybe 10 seconds. If I let the engine warm up for 30 seconds or so before driving off, this won't happen. Sean05/Richpuer, does your car need any fix or it runs perfectly fine as time go on. Thanks in advance.
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12-07-2011, 11:02 PM | #10 |
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Seems to be a common problem on the M3. I think it's the Idle Control Valve.
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12-07-2011, 11:16 PM | #11 | |
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12-07-2011, 11:16 PM | #12 | |
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What I have noticed was this: On a cold start, if I drive off immediately after firing the on button, and stop at my gate a few hundred feet down waiting for it to open, it will do the rpm bounce. Basically I'm still driving with the cat warm up cycle. However, if I fire her up and let it idle in my garage until it finishes the cold start cycle, then it will not do the rpm bounce. This leads me to conclude that it does this as the car is warming up. SA also told me that when car is cold, it uses up alot power before everything gets working so putting car in reverse after starting her up could affect the process of warming cats..either way it hasn't got worse, no codes and car drives fine. |
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12-07-2011, 11:21 PM | #13 |
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12-08-2011, 12:57 AM | #15 |
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I had a similar problem and was convinced it was my idle control valve. On cold start, my car would nearly stall and idle very roughly until I warmed the cats up. However, the dealership found no ECU faults and suggested it might be a batch of bad gas, especially as additive formulations do change around this time of year for the winter season.
Sure enough, the problem went away with gas from a different station (Chevron). Who knew the solution could be so simple? Good luck!
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12-08-2011, 01:21 AM | #16 |
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Mine does the same thing and the cold it gets the bouncing gets worse. Once it warms up it's all fine. Another thing that doesn't help is the gas companies mixing a different mixture of gas for the winter - I heard it's not that great for cars but they do it for emissions purposes - maybe that is also part of it. I see lots of these threads pop up lately...
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04-20-2012, 05:07 AM | #19 | |
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BMW Fault found with ICV with no fault code registered
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Last edited by PKM3; 04-20-2012 at 05:37 AM.. Reason: Correction |
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03-17-2013, 01:50 PM | #20 |
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Cold start idle bounce, uneven idle all the time
I am having similar issues. I had the problem while under warranty but the dealer said they didn't notice it. My car just went out of warranty less than a month ago.
I went to the dealer where I bought the car, Bob Smith BMW and they told me while under warranty that they couldn't look at it unless I bought a $299 fuel injector cleaning. I complained to BMW USA and they said they would have someone from Bob Smith BMW get back to me which they didn't BMW USA said take it to another dealer and they "may" be able to help me out with it. So I went to Rusnak BMW in Thousand Oaks and they said no problem and set an appointment. Then when I showed up they asked me to sign a paper authorizing them to charge me $145 an hour to diagnose and if BMW USA said they would help out we could discuss it after the fact. I am really disguisted. When I put on 19' wheels and Pilot Super Sports and got my first flat I was denied the included road side service because they weren't original wheels/tires. What does that have to do with a screw in the tire? Dead battery, "we will try to be there in an hour but it may take longer" Don't bother, I sent someone to Pep Boys for jumper cables. Now I just sold my Toyota Tundra and need an SUV and BMW says what can we do to earn your business?
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03-17-2013, 01:56 PM | #21 | |
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03-17-2013, 02:11 PM | #22 | |
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If it threw codes and the dealer merely reset the codes and sent you on your way, then you have, in my opinion, a strong case. |
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