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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 04-09-2016, 06:22 PM   #1
Edduh507
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2000 e46 Misfiring

Hi guys, I need help with my 2000 323i. I been misfiring n I've narrowed it down to cylinder 1-3. I've replaced all 6 coils and spark plugs but the vehicle is still misfiring. Is there something I'm overlooking?
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Old 04-09-2016, 06:53 PM   #2
Nicker
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Join Date: Jun 2007
Location: LI NY
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My Ride: 323ci
What codes is the system telling you?

If you do not know, I suggest getting these:
http://amzn.com/B0054FJEDK
http://amzn.com/B005NLQAHS (for android phones).

along with the OBDFusion app for a smart phone.
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00' 323ci - 170hp
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Old 04-09-2016, 08:21 PM   #3
Edduh507
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Oh yeah sorry I forgot to mention the codes. Here r the fault codes
02 sensor adaption limit, Cyl #1-3

02 sensor adaption limit, Cyl #4-6
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Old 04-09-2016, 08:22 PM   #4
Edduh507
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I'm using a Peake Code Reader
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Old 04-09-2016, 09:08 PM   #5
jfoj
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Location: Fairfax, VA USA
Posts: 18,458
My Ride: 330CiC, M5, X5
You have a Lean problem. Most likely vacuum leaks from the lower intake boot and/or CCV hoses.

You NEED OBDFusion. Peake will not help you here.

DO NOT replace any sensors at this point.

Read my comments in these threads:

http://forum.e46fanatics.com/showthread.php?p=16727145

http://forum.e46fanatics.com/showthread.php?t=929501
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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 04-09-2016, 10:51 PM   #6
Edduh507
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Thanks a lot mate. Your input has helped me a lot. I'll look into the vacuum leak to see what's going on
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Old 04-23-2016, 07:02 AM   #7
Edduh507
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I unplugged MAF n misfiring stopped. Sure enough there r several huge cracks on my intake boots. I'm getting ready to install a new one as I upload some photos. Thank you very much for the help
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Old 05-13-2016, 06:27 PM   #8
Edduh507
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Ok couldn't find a way to upload that photo here.
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Old 05-13-2016, 06:30 PM   #9
Edduh507
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The Check Engine Light went away from a few drives them came back this time this time without misfiring. Here are the fault codes
02 sensor adaption limit, Cyl #1-3

E4 02 sensor adaption limit, Cyl #4-6
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