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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-29-2014, 07:07 AM   #1
xJaay
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Join Date: Mar 2014
Location: Iceland
Posts: 5
My Ride: 99, 320i
Unhappy E46 Stalling

So I've been having some idle issues and stalls where my e46 320i is idling at different speeds from time to time from 600-1000. Then when it's cold up until it has reached its prime heat it stalls.

If I were to start the car from a cold start and let it warm up on its own without any driving it would eventually stall until the engine shuts off.

My MPG is also much worse than it was before.
And if the car is idling it also uses up much more fuel.

I started off by changing the fuel filter then I read the codes from the car and the MAF one came up. I bought a used MAF from ebay and switched them out. It stalled just as much or even more. After this i changed both hoses from the MAF to the intake. Then I borrowed a friends MAF sensor and reset the codes and read it again and no codes popped up. It seemed to work fine for a few days until it stalled once again and my fuel economy got worse.

So what could be the solution to this?

Last edited by xJaay; 10-29-2014 at 07:10 AM.
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Old 10-29-2014, 08:07 AM   #2
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 11,064
My Ride: '06 330CiC, '03 M5
Quote:
Originally Posted by xJaay View Post
So I've been having some idle issues and stalls where my e46 320i is idling at different speeds from time to time from 600-1000. Then when it's cold up until it has reached its prime heat it stalls.

If I were to start the car from a cold start and let it warm up on its own without any driving it would eventually stall until the engine shuts off.

My MPG is also much worse than it was before.
And if the car is idling it also uses up much more fuel.

I started off by changing the fuel filter then I read the codes from the car and the MAF one came up. I bought a used MAF from ebay and switched them out. It stalled just as much or even more. After this i changed both hoses from the MAF to the intake. Then I borrowed a friends MAF sensor and reset the codes and read it again and no codes popped up. It seemed to work fine for a few days until it stalled once again and my fuel economy got worse.

So what could be the solution to this?
Put your original MAF back on the car for now.

Read the 1st and 2nd links below in my signature.

Need warm idle Fuel Trim data, codes and Freeze Frame info.

CCV and hoses, lower oil return hose from the CCV is the main culprit, valve cover cracks, power brake booster leaking vacuum, DISA.

Possible fuel pump soft as well.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

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

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 10-29-2014 at 08:09 AM.
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Old 10-29-2014, 08:49 AM   #3
Willie00328I
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Join Date: Nov 2012
Location: Washington
Posts: 389
My Ride: 2000 328I sedan
When you change your CCV hoses also change your air distribution manifold O-rings

http://m.ebay.com/itm?itemId=181514849852
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Old 10-29-2014, 08:59 AM   #4
Mackey
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Join Date: Oct 2014
Location: Kennesaw
Posts: 12
My Ride: Currently nothing :(
I had similar things going on with my 330. Except after about the 3rd time it stalled it would not start back up. My fuel pump failed and I have a good feeling yours has failed too.
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