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Old 05-05-2012, 02:49 PM   #1
boongsin12
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2003 325xi rpm drop at start up

Hi,

I have been noticing the drop of rpm when the car starts. When the car starts first thing in the morning, it seems as it is going to stall and it has done so a couple times. When the weather is nice, it won't stall though. After engine stall/nearly stall, it starts up normally and it does so for the rest of the day.

Here is a little video of the rpm meter this morning. At 5 seconds into the video, I let my foot off the pedal and from 6 to 7 seconds, the needle drops quickly from 1K to ~600. It happens again at 18-19 seconds into the vide



I hope you can watch the video now )

Does anyone have the similar issue?

Last edited by boongsin12; 05-12-2012 at 10:19 PM. Reason: video
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Old 05-12-2012, 02:32 PM   #2
jfoj
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Suggest you read the first link below in my signature.

Given the age and mileage, I would consider replacing the DISA, fuel pump & filter and at a minimum the CCV lower oil drain hose and the lower intake boot.
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Lower hose fan switch O-ring - BMW #13621743299
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Old 05-12-2012, 03:19 PM   #3
jasonbimmer
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and make the video public so we can actually watch it.
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Old 05-12-2012, 08:53 PM   #4
boongsin12
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Ahh stupid me, I must have forgotten about the privacy setting. Now its public
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Old 05-12-2012, 09:39 PM   #5
jasonbimmer
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Quote:
Originally Posted by boongsin12 View Post
Ahh stupid me, I must have forgotten about the privacy setting. Now its public
now you broke the link
just post youtube link directly
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Old 05-12-2012, 10:15 PM   #6
boongsin12
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I have to hate this touch pad.

Anyway, here it is.

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Last edited by boongsin12; 05-12-2012 at 10:19 PM.
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Old 05-12-2012, 10:27 PM   #7
jasonbimmer
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vacuum leak
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Last edited by jasonbimmer; 05-13-2012 at 01:02 AM.
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Old 05-13-2012, 12:37 AM   #8
botaman
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Vacuum leak.
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Old 05-13-2012, 12:34 PM   #9
boongsin12
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Vacuum leak is what I suspected as well. I replaced both the lower and upper intake boots as well as the DISA valve. The DISA valve plastic holder was broken off so I had to replace the whole unit. I haven't yet taken my time and resources to replace CCV hose for the moment, which will be my next task.

As far as the maintenance goes, I have not yet checked the fuel filter and fuel pump as of now. I have, although, taken off my back seat and fuel tank cover to attempt to take a look at my fuel pump. I was not able to take the rubber hose off. The area circled in red shows the hose connection to the fuel pump, which is PITA to take off. In the process, I have also found out that there is massive amount of rust built up on the fuel pump caps. I don't reckon this is natural. I plan to buy some caps in the future to replace when I replace the fuel pumps.

https://plus.google.com/photos/11378...69370171454177

As for the start up problem I am having, I just recorded another video showing the problem better than the previous video.



In this video, I first try to turn on the car after being parked over night. The engine stalls at first, so I fire her up once again. The idle RPM is very high for first few seconds. Eventually, it settles down to 600 which seems like a reasonable RPM for my case. I suspect a couple of things, CCV and fuel pump/filter. I don't think vacuum leak is the problem in my case since I do not get any hesitation from the engine when it runs. But I will definitely change out CCV in the near future.
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Last edited by boongsin12; 05-13-2012 at 12:35 PM.
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Old 09-10-2012, 06:08 PM   #10
wildcat293
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Did you ever find a fix?

I have a similar issue, the first start stalls, then the car will start up perfect on the second try. Idle is not rough. Might be time to build that glow plug smoke machine....

I have tried the following:
beisan vanos
complete cold air CCV
new intake boots
new fuel pump assy
new disa gasket (disa inspected & tested)
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