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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 Sun, Jun-16-2019, 09:59:17 PM   #11
mrgizmo04
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Default Re: Very Rough Idle

Is this after replacing the coils?

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Old Sun, Jun-16-2019, 10:22:43 PM   #12
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Default Re: Very Rough Idle

Id replace coils


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Old Sun, Jun-16-2019, 10:23:08 PM   #13
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Default Re: Very Rough Idle

Quote:
Originally Posted by mrgizmo04 View Post
Is this after replacing the coils?

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No, this is before. I wanted to check codes before buying the coil/spark plug kit.
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Old Sun, Jun-16-2019, 10:25:02 PM   #14
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Default Re: Very Rough Idle

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Originally Posted by ThunderMoose View Post
Id replace coils
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Really? I'm getting misfires on all cylinders. That doesn't seem like coils to me.
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Old Tue, Jun-18-2019, 06:16:24 AM   #15
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Default Re: Very Rough Idle

More data from the code reader:
I got a new code: P0300 RANDOM/MULTI CYLINDER MISFIRE

I read live data and got the following:
LOAD_PCT 21.2%
ECT 59
SHRTFT1 0.0%
LONGFT1 0.8%
SHRTFT2 0.0%
LONGFT2 1.6%
RPM 899/MIN
SPARK ADV 21.5
IAT 38
MAF 5.69G/S
TP 0.0%
AIR_STAT OFF
02S11 0.155V
O2S12 0.04V
O2S21 0.020V
O2S22 0.025V
SHRTFT12 99.2%
SHRTFT22 99.2%
SHRTFT21 0.0%
SHRTFT11 0.0%

Saw some tests labeled $01, $02, $03, $05
TEST $01 DATA
MAX TEST
VALUE 3
MIN --
MAX 2
FAIL

TEST $02
MAX TEST
VALUE 1719
MIN--
MAX 2000
PASS

TEST $03
MAX TEST
VALUE 350
MN --
MAX 350
PASS

TEST $05
MIN TEST
VALUE 44
MIN 41
MAX --
PASS

There was no $04
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Old Wed, Jun-19-2019, 06:25:04 AM   #16
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Default Re: Very Rough Idle

Any ideas on what to trouble shoot next? I'm at a loss with this one. Multi cylinder random misfires and multi cylinder misfires with fuel shut off. Definitely doesn't not seem like the coils.

Plus it pretty much came out of nowhere.

Is it possibly bad gas? It happened right after I filled up. Although it was Chevron. Just grasping at possibilities due to the coincidence.
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Old Wed, Jun-19-2019, 12:04:07 PM   #17
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Default Re: Very Rough Idle

Get a BMW specific code reader hooked up to it.

I doubt it's gas related.
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Old Wed, Jun-19-2019, 01:36:53 PM   #18
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Default Re: Very Rough Idle

Blew my o2 Heater fuse at the track, causing the o2s to effectively no longer function. This resulted in misfires on all cylinders and the same fuel code as yours. I did get a o2 sensor heater wire code though, so maybe it's not it, but worth checking out the o2 sensors, to see if they're functioning properly/what they are reading.
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Old Wed, Jun-19-2019, 04:52:57 PM   #19
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Default Re: Very Rough Idle

I had 1 bad coil and got misfires on multiple cylinders. Don't rule out the coils.
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Old Wed, Jun-19-2019, 05:45:57 PM   #20
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Default Re: Very Rough Idle

check fuel pressure with gauge near the pump blumping system -- should be 5 bar or 72psi
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Discussing Very Rough Idle 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)