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General E46 Forum
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Old 10-12-2014, 03:58 PM   #1
davidlopez69
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Join Date: Oct 2014
Location: Orange County, CA
Posts: 13
My Ride: 2001 330i
Exclamation Rough idling and misfire!

Hi guys, Im new to E46 fanatics and to the BMW world.
Alright so I've had my 2001 BMW 330i over a year now currently at 155k
My car was fine 2 days ago and recently my car has had a very rough idle and misfire on all 6 cylinders. Now i have researched on here and found very similar forums but have not fixed my problem yet so if anyone could direct me to the right thread or tell me what to do.

Just replaced:
-spark plugs
-ignition coils
-O2 sensors

So I just replaced these and computer says Im still misfiring on all 6 cylinders and have a rough idle... and even it turned off once... I have already checked for leaks in the intake boots and nothing i have also done the MAF test to see if it preformed worse but no so I know its not the MAF sensor. My next guess would be fuel injectors or fuel pump or filter but is there anyway one can know for sure before I do anything else super expensive
Thanks!
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Old 10-12-2014, 06:55 PM   #2
lszlszx
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Location: Socal
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My Ride: 1.8T, XC70
What type of code reader do you have?
Scan for codes, if there are codes set, post freeze frame data.
That is needed to help you diagnose it.
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"Would the codes indicate if it's the carburator?"
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Old 10-12-2014, 08:17 PM   #3
markusmarkus
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You've missed likely have a vacuum leak. I bet you'll read a P0174 code. Very common issue. It could also be a cam position sensor but I'm getting a vacuum leak is the culprit.


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Old 10-12-2014, 08:18 PM   #4
markusmarkus
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"...missed...." should be "....most..."!


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Old 10-12-2014, 08:51 PM   #5
jfoj
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My Ride: 330CiC, M5, X5, E93
Problem is not going to be fuel injectors or coils.

Vacuum leak or fuel pump are the most likely causes.

Codes, Freeze Frame and Fuel Trim data would be useful.

In the short term, read the first 2 links below in my signature.
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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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 10-12-2014, 09:03 PM   #6
mbogosia
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In regards to the fuel pump if you don't know when it was last replaced or it has never been replaced you might as well do it anyways before it fails and leaves you stranded.
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Old 10-13-2014, 08:18 AM   #7
markusmarkus
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Quote:
Originally Posted by mbogosia View Post
In regards to the fuel pump if you don't know when it was last replaced or it has never been replaced you might as well do it anyways before it fails and leaves you stranded.

And replace the following when you replace the fuel pump:
- fuel filter
- fuel hoses and clamps at fuel filter
- vacuum hose from fuel filter to intake


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Old 10-13-2014, 02:36 PM   #8
davidlopez69
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My Ride: 2001 330i
Alright thanks a lot for the feed back guys im going to my mechanic right now to check for the vacuum leak once again and also to replace fuel filter and pump
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Old 10-13-2014, 02:37 PM   #9
davidlopez69
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I will be back to post what the culprit was
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Old 10-14-2014, 01:37 AM   #10
davidlopez69
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Join Date: Oct 2014
Location: Orange County, CA
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My Ride: 2001 330i
aright so I found the problem! It was a vacuum leak like markusmarkus said along with my DISA. replaced both and my car is running better than before along with fuel filter and pump thanks a lot guys!
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Old 10-14-2014, 05:25 AM   #11
jfoj
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Location: Fairfax, VA USA
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My Ride: 330CiC, M5, X5, E93
Just to prepare you for all the vacuum leaks your engine may have, check the 1st link below in my signature. Brake booster failures are becoming common around year 12 on these cars as well. Been seeing more and more of these lately.
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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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 10-14-2014 at 05:25 AM.
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