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Old 09-14-2017, 06:12 PM   #1
Kyledale4
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P1343/ Misfire in cylinder 1 with fuel cut off

This isnt the first time I've had this code pop up in the 2 years I've had my 03 325xi and the first time I narrowed the problem down to the coil, so I changed out all of them even though they may not have been faulty, and I also kept the OEM coils also, today I pulled the coil out and replaced it and cleared the codes and nothing changed, so I tried the other 5 OEM coils I had and still no change even with clearing the codes. So I went to O'rileys and bought a new spark plug hoping this would be the problem and nothing happened, this is the only code that shows up so I don't know what to go for next.
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Old 09-14-2017, 06:37 PM   #2
kbsilver
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I had some similar (non coil related) misfires in our 540. In this case it was a bad connection (crimp?) at the fuel injector socket for that cylinder (apparently common enough the dealer knew what it was right away). The dealer spliced in a new socket for one cylinder. For the other I found if I just tugged on the wire to the socket, problem went away for a few years each time. May or may not be your issue.
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Old 09-14-2017, 07:43 PM   #3
Kyledale4
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Originally Posted by kbsilver View Post
I had some similar (non coil related) misfires in our 540. In this case it was a bad connection (crimp?) at the fuel injector socket for that cylinder (apparently common enough the dealer knew what it was right away). The dealer spliced in a new socket for one cylinder. For the other I found if I just tugged on the wire to the socket, problem went away for a few years each time. May may not be your issue.
I looked for this and I didn't see any crimped or pinched wires anywhere
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Old 09-14-2017, 08:21 PM   #4
jfoj
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Most misfires are actually due to Lean problems.

I think you can rule out secondary ignition at this point.

Need to see Freeze Frame and warm idle Fuel Trim info. Also need to see the exact code in the Pxxxx format.

Is the misfire constant or does it clear when you restart the engine?
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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 09-14-2017, 08:39 PM   #5
Kyledale4
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Quote:
Originally Posted by jfoj View Post
Most misfires are actually due to Lean problems.

I think you can rule out secondary ignition at this point.

Need to see Freeze Frame and warm idle Fuel Trim info. Also need to see the exact code in the Pxxxx format.

Is the misfire constant or does it clear when you restart the engine?
it's pretty clear when the engine starts it'll shake pretty bad and it sounds like it has a high roller cam in it. I can clear the code and it'll be right back on in about a minute and that'll be the only one that will pop up, so an O2 sensor isn't catching anything if it's running lean
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Old 09-14-2017, 08:58 PM   #6
jfoj
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Quote:
Originally Posted by Kyledale4 View Post
it's pretty clear when the engine starts it'll shake pretty bad and it sounds like it has a high roller cam in it. I can clear the code and it'll be right back on in about a minute and that'll be the only one that will pop up, so an O2 sensor isn't catching anything if it's running lean
Not sure this is the case, an O2 sensor can detect if there is a Lean problem, HOWEVER, on start up, cold or even partially cold the engine runs in Open Loop with cold start enrichment while the O2 sensors are coming online. Additionally if there is only a single misfire, the engine fuel management system can only adjust the fuel delivery by around 25% which may not be enough to mask a Lean condition and this is just masking the problem, not correcting the problem.

So you need to provide some solid data to back up what is going on. Codes in the Pxxxx format, Freeze Frame and warm idle Fuel Trims.

Also suggest you read the first post in this thread at least 3 times: Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616
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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; 09-15-2017 at 09:31 AM.
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Old 09-15-2017, 08:40 AM   #7
kbsilver
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Quote:
Originally Posted by Kyledale4 View Post
I looked for this and I didn't see any crimped or pinched wires anywhere
This is nothing you can see. What I am talking about is corrosion between the wire and the connector INSIDE the plug that connects to the fuel injector. Inside the plug the actual metal connector is crimped onto the wire.
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Old 09-15-2017, 09:35 AM   #8
markusmarkus
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OP, listen to what jfoj is saying. He knows his stuph!
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