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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-13-2012, 09:33 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
Posts: 9
Mein Auto: 02 325XiT
Rough on 1st start...still after hours of searching forums!

Here's the background...I'm a used car dealer that specializing in Europeans... I take pride in what I sell and have a 02 325Xit with 128k that's giving me a bit of issue. I know I'm a newbie here but I promise I've read every thread on the subject. So here goes nothing....

Symptoms:

1st start of the day...starts right up, idles at about 700ish or so (ambeint temps are about 30-45 these days) but feels like theres a soft miss like one cylinder is misfiring. Here's the catch...after about 40 seconds it's completely gone and will not return throughout the course of driving it during the day.

I've put about 400 miles on it, highway speeds and all and it drives mint! I just know this is not right because I have two other e46's on the lot and they don't do it

There's no active ses light. I've got a computer for BMW's and it has stored misfires 2, 4 and 6.

I originally brought it to my mechanic who's ususally decent with Euro's and they replaced one coil pack. It continued to do the same thing so I brought it to the BMW indie in town and he smoked it, checked fuel pressure, checked for leaking injectors, and looked at all the usual culprits such as intake boots, ccv system, vanos, and all the hoses and connectors, disa, etc.

I don't know where to go from here.

I changed plugs to Bosch+4, all 6 coils, and the valve cover gasket yesterday and there's no difference.


HELP!!!!!
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  #2  
Old 10-13-2012, 10:01 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
Posts: 9
Mein Auto: 02 325XiT
ALSO, swapped the MAF with a known good working one...

Anybody?
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  #3  
Old 10-13-2012, 10:09 AM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
Join Date: Mar 2008
Posts: 610
Mein Auto: 2004 325XI Sport pkg
Hi and welcome! For that mileage I would change fuel filter first and pour bottle of injector cleaner into gas tank during next fill up for the beginning.
Also fresh battery may help. Overnight it gets discharged causing rough idle after start, and next thing you may not start the car some day. I had this, you may search "car not start". What you have is may be early symthom or dying battery. You may find perfect aftermarket for half price vs. original BMW. Works just fine.

Last edited by LX-biker; 10-13-2012 at 10:20 AM.
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  #4  
Old 10-13-2012, 10:42 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
Posts: 9
Mein Auto: 02 325XiT
It's got a new battery as of a month ago. Fuel injector cleaner was used by my BMW indie. I don't see how a fuel filter would only affect the first 40 seconds after starting it cold. It has full power and doesn't miss a beat any other time.

Anyone elses thoughts on a fuel filter causing this?
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  #5  
Old 10-13-2012, 10:50 AM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
Join Date: Mar 2008
Posts: 610
Mein Auto: 2004 325XI Sport pkg
Injector clener may washout from old filter dirt and clogh injectors. That's why mechanics recommend do not use injector cleaner with very old fuel filter... However your case may be really more complicated...
40 seconds... fuel pump needs develop pressure, it's more difficult with clogged filter I guess.

Last edited by LX-biker; 10-13-2012 at 10:53 AM.
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  #6  
Old 10-13-2012, 10:57 AM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
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Mein Auto: 2004 325XI Sport pkg
also may be water (condensation) in the fuel tank...
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  #7  
Old 10-13-2012, 10:58 AM
jornander jornander is offline
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Location: Duluth, MN
 
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Mein Auto: 02 325XiT
wouldn't fuel pressure loss be ruled out when they checked fuel pressure overnight with a guage and it didn't drop?
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  #8  
Old 10-13-2012, 10:59 AM
jornander jornander is offline
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Location: Duluth, MN
 
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Mein Auto: 02 325XiT
I've gone through a couple tanks of fuel too...
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  #9  
Old 10-13-2012, 11:02 AM
lgr122 lgr122 is offline
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Location: Finland
 
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Mein Auto: BMW e46 1,9l M43
Did you have oil change lately?

Mine was bit rough in starts but fresh oil seem to helped about it.
As if some parts get enough lubrication only after engine warmed up?

Ofcourse yours might have some other reason as well...
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  #10  
Old 10-13-2012, 11:04 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
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Mein Auto: 02 325XiT
Yeah I actually changed it a few hundred miles ago to MObil 0w40
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  #11  
Old 10-13-2012, 11:08 AM
jornander jornander is offline
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Location: Duluth, MN
 
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Mein Auto: 02 325XiT
Thanks for your help so far...This is really a stumper isn't it!!! I'm absolutely lost
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  #12  
Old 10-13-2012, 11:10 AM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
Join Date: Mar 2008
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Mein Auto: 2004 325XI Sport pkg
If I get the same with my car at the same point and after what you done, I would try MAF and idle control valve cleaning procedure. You can find it on this forum.
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  #13  
Old 10-13-2012, 11:19 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
Posts: 9
Mein Auto: 02 325XiT
I swapped the MAF from another car...it was in good working order

I'll try cleaning the ICV
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  #14  
Old 10-13-2012, 09:34 PM
GoForthFast GoForthFast is offline
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Location: New York
 
Join Date: Jul 2004
Posts: 2,208
Mein Auto: '04 330Ci 6-speed
I had leaking injectors. Started with a strong gasoline smell after sitting for 15-60 minutes. Quick repeat starts and overnights were fine.
New injectors cured.
Just put this out for any possible resonance with your situation.

How did you check the injectors?
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  #15  
Old 10-14-2012, 08:33 AM
jornander jornander is offline
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Location: Duluth, MN
 
Join Date: Oct 2012
Posts: 9
Mein Auto: 02 325XiT
My bmw indie checked for leaking injectors with a fuel pressure gauge. There was no sign of leakage even overnight. There's no gas smell ever. He did say that the spray pattern could be off causing the injectors to spray the intake instead of directed to the valve. He suggested I run some JB fuel system clean through the tank. So I'm trying that and as how it goes

I checked the icv and its functioning and clean

I don't know where else to go from here

I had a Taurus on the lot that did this once and it was the intake manifold gasket. It would miss the first min or so of idling and then be fine cause the heat would expand the gaskets and plastics to stop the air leak


Supposedly my bmw mech already checked for that though

Any other thoughts would be so helpful

Thanks
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  #16  
Old 10-15-2012, 05:47 PM
LX-biker LX-biker is offline
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Location: Ontario, Canada
 
Join Date: Mar 2008
Posts: 610
Mein Auto: 2004 325XI Sport pkg
Hi again, just another idea about waterpump plastic impeller came off and does not rotate when engine just started. I had that but when temperature goes below 0C. Eventually it will stop rotating with WP shaft when driving and engine overheat as result... And all depends from your reaction next.
May be no much logic for you in this idea but i experienced that and its pretty common for bmw.
Good luck.
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