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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-21-2016, 04:18 AM   #1
joplin321
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Engine issues, don't know exactly whats causing the problem, could use some help

Hey all, so I picked up a clean '02 M3 a week or two ago, and tonight, I got this nasty shaking after backing out of a parking space along with a bright pretty SES light... yay... I got home finally after limp mode made me want to punch something, and read the codes. this is what i got

I did some reading, found several culprits for whats causing such a rough idle and the infamous limp mode...

DMTL could be bad (haven't looked at it yet)
Gas cap could be loose (Resolved, not a contributing issue)
Coil packs being toast (haven't had time to pull them out and attempt diag.)

Oil level is fine, car is running on premium from valero... 93 AKI

What could be causing these misfires?
I cleared the codes, still got rough idle... not near as severe as it was initially, but still significant, and the SES light is still lingering.. It disappeared after code reset, but came back on upon a small trip around the neighborhood block....

I'm at a loss, anyone know what the issue could be?
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Old 08-21-2016, 08:29 PM   #2
Cayne23
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Coils. Replace all 6
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Old 08-22-2016, 06:00 PM   #3
Jan Nelson
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I would replace the coils as a set as Cayne23 suggests. While at it, you might want to establish a baseline and do the plugs, wires, etc... I would also send an oil sample to Blackstone for analysis. Getting to a known state on the car will make it easier to plan for the maintenance issues that will pop up over time.

Peace.
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Old 08-22-2016, 06:15 PM   #4
joplin321
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Found the problem coil. Money is a lil tight right now, so only replaced that one, but I have a buddy at my dealership who gets me a discount on parts so I'm a few weeks I'll have 6 OEM BOSCH coils and new spark plugs in
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Old 08-22-2016, 06:36 PM   #5
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Just a little tip. The ngk bme plugs r like 16 bucks each. Go to ngk's wnsite and get the same exact plugs for 9 bucks each. Thats what i did. Its the same sh!t
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Old 08-23-2016, 04:39 PM   #6
joplin321
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Just a little tip. The ngk bme plugs r like 16 bucks each. Go to ngk's wnsite and get the same exact plugs for 9 bucks each. Thats what i did. Its the same sh!t

Thanks!!! I'll definitely look into that! I didn't know they were the same thing so I'll definitely go to their site!! I really appreciate it!
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Old 08-23-2016, 05:10 PM   #7
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Ngk dcpr8ekp. My 02 m3 uses these
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Old 08-26-2016, 11:17 AM   #8
joplin321
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Just ordered them! Thanks!
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Old 08-26-2016, 11:27 AM   #9
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Do the water glass test to find which coil. Replace all.

Save one of the working ones for long road trips.
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Old 08-26-2016, 05:54 PM   #10
joplin321
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Do the water glass test to find which coil. Replace all.

Save one of the working ones for long road trips.

Already figured it out and remedied the issue! I greatly appreciate everyone's response and wisdom they shared!!
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Old 08-26-2016, 06:26 PM   #11
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Nod;
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Old 08-30-2016, 11:52 AM   #12
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Do the water glass test to find which coil. Replace all.

Save one of the working ones for long road trips.
Curios what this test is? I typically just unplug one at a time and see if the engine idle changes.

I carry a spare in every BMW, ever since I had one crap out on a road trip. Peace of mind
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Old 08-30-2016, 12:20 PM   #13
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Curios what this test is? I typically just unplug one at a time and see if the engine idle changes.

I carry a spare in every BMW, ever since I had one crap out on a road trip. Peace of mind

Its a well-known Youtube video. He places a water glass 1/2 full on engine and unplugs one coil at a time. The circular pattern of the water in the glass is simply a visual indication of idle change - or not.
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Old 08-30-2016, 09:24 PM   #14
joplin321
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Its a well-known Youtube video. He places a water glass 1/2 full on engine and unplugs one coil at a time. The circular pattern of the water in the glass is simply a visual indication of idle change - or not.

Exactly. However, you don't REALLY need to put the glas of water on the intake manifold, all you have to do is just pay attention to when the idle gets rougher, and if it doesn't, then you found the culprit
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Old 08-30-2016, 09:31 PM   #15
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Exactly. However, you don't REALLY need to put the glas of water on the intake manifold, all you have to do is just pay attention to when the idle gets rougher, and if it doesn't, then you found the culprit
Given that these cars are almost always in limp mode (failed coil) when one is doing a water test and therefore running somewhat rough - the water glass just makes it easier.
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Old 08-31-2016, 09:14 AM   #16
BUDGET76
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Given that these cars are almost always in limp mode (failed coil) when one is doing a water test and therefore running somewhat rough - the water glass just makes it easier.
Thanks, good to know. even in limp mode there's always been a VERY discernible difference in sound to me. But hey, water works too
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