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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 10-19-2010, 07:50 PM   #1
veli510
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Join Date: Oct 2010
Location: CA
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My Ride: 2001 BMW 330i
Getting code: P1347 Misfire Cylinder 3 With Fuel Cut-off

I just got this code P1347 today. I've changed spark plugs but the cheap NGK not to long ago, and the seem to be fine for about a good a month. I also changed valve cover gasket as well and it was running fine. I also took my car for a fuel pump change at AMMCO about 2 months ago. Changed the fuel filter myself and fuel relay. I do have codes p0174 which is my intake but i'm more concern about the P1347 code cause i have rough idle now and it bugs me. Should i buy a new set of spark plugs?
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Old 10-20-2010, 07:36 AM   #2
shanneba
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Join Date: May 2008
Location: Indiana
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The first thing you should do is search here for the code you have. That will return many threads where others have had the same code.
Like this one with additional troubleshoot steps:
http://forum.e46fanatics.com/showthr...sfire+cylinder


You should fix the intake boot that you know is bad. Running lean could contribute to the misfire condition.

You should do some troubleshooting on cylinder 3 rather than just throwing a set of plugs at it.
Coils do fail, you could move the coil from cylinder 3 to another cylinder, see if the misfire code changes to that cylinder. If the misfire follows the coil, it is likely the cause and you can replace the coil. While moving the coil inspect the spark plug boots for any obvious signs of issues.
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Last edited by shanneba; 10-20-2010 at 07:42 AM.
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Old 10-20-2010, 05:30 PM   #3
veli510
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Thanks for the information. I changed the ignition coil so it's good now. But yea I really need to change the intake boot
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Old 10-20-2010, 05:45 PM   #4
MacFady
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+1 on the boot. My torn boot caused be to throw misfire codes and fuel cut off. Fixed the boot and haven't thrown a code since. A $12 part from the dealer and 45min of time is about as cheap as trouble shooting can come. I'm pretty sure that is going to fix your problem. And make sure you give the ICV a good cleaning and check you're DISA while you're at it

I'll just ad that I did do the non-invasive DISA check that is in a video somewhere on this site and it seemed fine according to that test but upon further inspection the flap was actually broken so it doesn't hurt to pull it out and look. Just REMEMBER NOT TO LET THE PIN FALL INTO THE ENGINE. That issue also may have been contributing to my codes so I can't say it was 100% the torn boot.
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Old 10-21-2010, 03:25 AM   #5
veli510
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thanks ill definitely change the boot, i need to head to the dealership tomorrow or sometime this weekend. I've already cleaned my ICV, but ill surely check the DISA for a broken flap or anything abnormal. Thanks again!
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