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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Nov-06-2018, 08:17:45 PM   #1
Jack D
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Default rough idle and running

Okay so I have looked around on the forum and found similar problems but not the exact same. If I missed a thread that covers this please shoot me the link.
The Car: 2005 E46, has been running amazing the best car I have ever had.
I'm not a car guy but this is my hobby car and I have a lot to learn.
Problem: last week, it started up fine but without warning the Idle was very rough, misfiring, 95% loss of power. When I can get the RPM's up it runs but really rough. This lasts for about 15 min. then it usually gets better but still not back to normal.
confirmed error codes:P021(injector Circuit/open) not sure what that means
P0301(cylinder misfire)
pending error codes:300,302,304, looks like multiple cylinder misfires

This morning I took it out for a 45 min. drive and using my OBD2 and Fission,
I watched the voltage for o2 sensor #1 and #2.
Min.0-15 #1 bounced back and forth from 0-.001 and #2 bounced back and forth from 0-.11
Min 16-30 #1 and #2 jumped up and down from 0-.85 and the car ran better
not perfect but better.
Min. 31-45 they went back to about the same as the start.. 0-.11 and the car ran very rough...
Also the "service engine soon" light is on while it's running rough but goes off randomly.. maybe unrelated.
Not sure what is a symptom and what is a cause, I could use some direction.
thanks,
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Old Tue, Nov-06-2018, 11:46:42 PM   #2
Dee514
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Default Re: rough idle and running

My guess is a bad coil. Common problem and same symptoms you are experiencing.
Hope itís nothing major. Good luck
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Old Wed, Nov-07-2018, 03:04:26 AM   #3
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Default Re: rough idle and running

You drove 45 minutes with it misfiring?

Assuming you meant P0201 - Injector 1 circuit open/short and a P0301 - Misfire cylinder 1 detected.
I would guess you have a failed injector. Ohm the injectors and compare readings. If #1 shows OL itís NFG (No F*cking Good).
I would also check for power to the injector and make sure it is getting a ground signal from the DME. There have been cases of failing ignition coil or injector mosfets in the DME preventing output.
You should also rule out the ignition coil by swapping the coil with a coil from another cylinder to see if the miss follows. However, the fact that you have an active code for an open on the #1 injector kinda leads one to believe this may be the source of your issue.


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Old Wed, Nov-07-2018, 03:46:05 AM   #4
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Default Re: rough idle and running

That code means you have a shit connection to one of your fuel injectors
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Old Wed, Nov-07-2018, 04:16:43 AM   #5
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Default Re: rough idle and running

Quote:
Originally Posted by Drewster View Post
That code means you have a shit connection to one of your fuel injectors
+1 you can wiggle the injector connecting harness and see if idle improved or change. The pin connector do get loose.

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Old Wed, Nov-07-2018, 06:33:46 AM   #6
Jack D
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Default Re: rough idle and running

thanks for all the help. So, how is the O2 sensor connected to all of this? I watched it again today, the voltage drop in the O2 sensors was at the same time as the engine running rough and misfiring.
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Old Wed, Nov-07-2018, 03:06:21 PM   #7
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Default Re: rough idle and running

Quote:
Originally Posted by Jack D View Post
thanks for all the help. So, how is the O2 sensor connected to all of this? I watched it again today, the voltage drop in the O2 sensors was at the same time as the engine running rough and misfiring.
Wait... P0031? If so, where on earth did you get "Injector Circuit Open"?

P0031 means you have an O2 sensor with essentially a short circuit somewhere on Bank 1 pre-cat.

I would start by replacing that sensor, if that's the code you got.
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Old Sun, Nov-11-2018, 02:25:15 AM   #8
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Default Re: rough idle and running

First, sorry for the misinformation, I gave the wrong code number.
P0201,P0301,P0300,P0302
I switched around the ignition coils, the misfires were inconsistent. what remained the same is the P0201 code (injector Circuit open cylinder 1)
so... now what?
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Old Sun, Nov-11-2018, 02:33:24 AM   #9
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Default Re: rough idle and running

Quote:
Originally Posted by Jack D View Post
First, sorry for the misinformation, I gave the wrong code number.
P0201,P0301,P0300,P0302
I switched around the ignition coils, the misfires were inconsistent. what remained the same is the P0201 code (injector Circuit open cylinder 1)
so... now what?
That means that the injector is not shutting off like it should and its wide open making the car run rich on that 1 cylinder....

That's why it's running rough because ur sorta running on 5 cylinders, I'm sure if u pull that 1 spark plug it will be black

And because of that misfire running rich on that 1 cylinder then the o2 sensors are being thrown off because of the unburnt gas from that cylinder hitting the 02 sensor, swap one of the injectors with another injector and see how that goes

If the misfire follows that injector after u swap it with another one then u will know that injector has failed

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Old Sun, Nov-11-2018, 05:33:33 AM   #10
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Default Re: rough idle and running

Quote:
Originally Posted by Jack D View Post
First, sorry for the misinformation, I gave the wrong code number.
P0201,P0301,P0300,P0302
I switched around the ignition coils, the misfires were inconsistent. what remained the same is the P0201 code (injector Circuit open cylinder 1)
so... now what?
Replace the injector and check the wiring on cylinder 1, dude! lol Explains your wacky air fuel ratio and your misfires. Just hope you didn't hurt the car by driving it like that for so long.
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Discussing Build Journal - RTD shifter - SMG to 6sp conversion in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)