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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 Thu, Sep-12-2019, 04:09:30 AM   #1
timc930
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Default DME Misfiring Cyl 1, 4, 6

Car started running rough on trip coming home tonight, Pulled codes:

CD DME Misfiring cyl 1 without cylinder output.
D0 DME Misfiring cyl 4 without cylinder output.
D2 DME Misfiring cyl 6 without cylinder output.
D5 DME Misfiring Several cylinders without cylinder output.

Wanted to post while I researched. I find it strange to lose 3 coils, so I am guessing I have a problem with the DME.

Last edited by timc930; Thu, Sep-12-2019 at 04:24:24 AM.
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Old Thu, Sep-12-2019, 04:43:50 AM   #2
bigjae1976
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Default Re: DME Misfiring Cyl 1, 4, 6

Blaming the DME is a bit premature especially when the DME is a much rarer issue than say...ignition coils.

Typically coils go out one by one. I recommend changing all 6 when even 1 coil goes dead.

First step, clear the codes, swap the 3 bad coils onto cylinders with the good coils and see if the misfire follows.


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Old Thu, Sep-12-2019, 12:05:55 PM   #3
timc930
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Default Re: DME Misfiring Cyl 1, 4, 6

Quote:
Originally Posted by bigjae1976 View Post
Blaming the DME is a bit premature especially when the DME is a much rarer issue than say...ignition coils.

Typically coils go out one by one. I recommend changing all 6 when even 1 coil goes dead.

First step, clear the codes, swap the 3 bad coils onto cylinders with the good coils and see if the misfire follows.


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First thing I did was clear the codes, several times, and each time came back with same 4 codes for cylinders 1,4,6.

Had a DME fail on previous BMW that actually turned off several injectors, had to pull the DME and swap the transistors out that controlled the injectors that failed.

I'm going to start with the coils and go from there.
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Old Thu, Sep-12-2019, 03:12:19 PM   #4
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Default Re: DME Misfiring Cyl 1, 4, 6

Don't overlook the spark plugs!
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Old Thu, Sep-12-2019, 03:26:12 PM   #5
eacmen
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Default Re: DME Misfiring Cyl 1, 4, 6

Quote:
Originally Posted by timc930 View Post
First thing I did was clear the codes, several times, and each time came back with same 4 codes for cylinders 1,4,6.

Had a DME fail on previous BMW that actually turned off several injectors, had to pull the DME and swap the transistors out that controlled the injectors that failed.

I'm going to start with the coils and go from there.


Before swapping stuff you can diagnose a bad coil very easily.

Take off strut brace, cabin air filter housing, and the engine beauty cover.

With engine running at idle unplug the wiring harness for each of the coils. If you can audibly hear a difference in how the engine is running then likely that coil is working as intended. If you notice NO change when unplugging the coil then you've found a bad one.

Good luck. I always pack spare coils for track days as they fail prematurely and often without warning.
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Old Thu, Sep-12-2019, 03:27:33 PM   #6
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Default Re: DME Misfiring Cyl 1, 4, 6

Quote:
Originally Posted by eacmen View Post
Before swapping stuff you can diagnose a bad coil very easily.

Take off strut brace, cabin air filter housing, and the engine beauty cover.

With engine running at idle unplug the wiring harness for each of the coils. If you can audibly hear a difference in how the engine is running then likely that coil is working as intended. If you notice NO change when unplugging the coil then you've found a bad one.

Good luck. I always pack spare coils for track days as they fail prematurely and often without warning.

The problem with that is itís hard to detect any difference when there are multiple misfires.


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Old Thu, Sep-12-2019, 03:33:25 PM   #7
eacmen
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Default Re: DME Misfiring Cyl 1, 4, 6

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Originally Posted by bigjae1976 View Post
The problem with that is itís hard to detect any difference when there are multiple misfires.


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I might misunderstand but I've had coils fail on two cylinders and the method above worked to identify both of them. DME was reporting misfires on three cylinders but it ended up only being two coils. Can you explain why it won't work?
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Old Thu, Sep-12-2019, 03:57:11 PM   #8
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Default Re: DME Misfiring Cyl 1, 4, 6

I just ordered 6 coils, as regardless, I'll just replace them. Prob not going to mess with swapping coils, as I've got three misfires and one bad coil could be causing that, and I was going to replace all of them any way when I hit 90K, and I just hit 90K on the way home last night, so going to do Coils, plugs, fluids, filters, belts valves etc etc as baseline, then reset the inspection.

I'll post my findings next week.
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Old Thu, Sep-12-2019, 04:00:59 PM   #9
eacmen
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Default Re: DME Misfiring Cyl 1, 4, 6

Quote:
Originally Posted by timc930 View Post
I just ordered 6 coils, as regardless, I'll just replace them. Prob not going to mess with swapping coils, as I've got three misfires and one bad coil could be causing that, and I was going to replace all of them any way when I hit 90K, and I just hit 90K on the way home last night, so going to do Coils, plugs, fluids, filters, belts valves etc etc as baseline, then reset the inspection.



I'll post my findings next week.


I did the same thing, replaced all 6 but wanted to know which coils were still good to keep as spares to use in a pinch. They're pretty expensive.
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Old Thu, Sep-12-2019, 04:25:48 PM   #10
timc930
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Default Re: DME Misfiring Cyl 1, 4, 6

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Originally Posted by eacmen View Post
I did the same thing, replaced all 6 but wanted to know which coils were still good to keep as spares to use in a pinch. They're pretty expensive.
That's a good idea to hang on to a few as spares. I'm guessing 2,3,5 are good, as those cylinders are definitely firing. I'll ck "Smooth Running Values" on scanner to verify which ones are actually good.
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Discussing e46 M3 Maintenance Thread 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)