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Old 04-09-2017, 08:33 AM
Greggie Greggie is offline
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Coils & Plugs

If this has already been discussed, my apologies. Yes, I am a newbie here, but, I've been a mechanic off and on for most of my life (I'm 54 yrs old), working for private repair shops. My last vehicle was a 05 Jeep TJ with 3.5" lift, body lift, engine lift, rear locker, 35" BFG Krawlers, and more, that I did every bit of work too.
But, this is my first BMW and I have been hesitant/nervous to do any real repairs to it as of yet, as I don't know much about BMW's, except performing basic maintenance on customers cars and I no longer work in the auto repair industry.
I bought my 2012 328 iX Coupe e92 N52 3.0 just over a year ago with just about 45,000 miles on it. At 53,000 miles it started running rough, so I had it scanned and came up with a misfire on #4 cyl. Brought it to the dealer (Non BMW) I bought it from, they checked it out and changed the coil. It fixed the problem. But, then at 63,000 miles, the engine started running rough again. I was sure it was another coil, but brought it to my local BMW dealer, where it was checked out and found to be the #1 coil, so I had them fix it. Now I am at 70,000 and the engine just started running exactly the same again. Fairly confident it's another coil and going to have it scanned to be sure.
Is this normal for coils to go so frequently and at this mileage? I have seen other's posts about going 100k+ before changing coils. I'm thinking about changing all 6 coils and since I'm there, spark plugs, but don't want to if there might be something else that could be causing coils to go bad every 10k miles.
Any positive input will be greatly appreciated.

Thanks,
Gregg
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Old 04-09-2017, 11:28 AM
CALWATERBOY DUE CALWATERBOY DUE is offline
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Old 04-09-2017, 02:32 PM
RWD-F10-N52 RWD-F10-N52 is offline
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your coils keep on going because your spark plugs are worn.

change all your spark plugs before they keep ruining coils.
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Old 04-09-2017, 03:01 PM
Greggie Greggie is offline
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Thank you!
Will be changing the plugs!
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Old 04-09-2017, 07:43 PM
Kashif_ Kashif_ is offline
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Quote:
Originally Posted by Greggie View Post
Thank you!
Will be changing the plugs!
I too was getting Misfires from bad plugs. I think 100 K it too much of an interval. I actually created a YouTube Video and at time point 7:40 you can see how bad the spark plugs were at 100K
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Old 04-10-2017, 06:11 AM
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07335 07335 is offline
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hmmm. My 335is had a misfire at 40K , plug #2. Replaced coil and issue resolved. Now at 43K and slight misfire (very rare). Did not scan for cylinder #. I know I am due for plugs at 45K. Did not know a bad plug could damage a coil. Would the IS model with 370 ft-lbs of overboost eat plugs and coils more than the 335 N54?
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Old 04-10-2017, 06:12 AM
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07335 07335 is offline
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The top reason ignition coils fail is bad spark plugs or plug wires. Another potential cause is heat and vibration, which can damage the ignition coil's windings and insulation. If an engine is experiencing repeated coil failures, the underlying cause may be resistance from worn spark plugs or excessive spark plug gap.


From the interwebs ....
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Old 04-10-2017, 08:10 AM
RWD-F10-N52 RWD-F10-N52 is offline
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It's possible.. 45k is early for coils but it's also tied to driving habits. I would change the spark plugs.
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Old 04-10-2017, 08:15 AM
Greggie Greggie is offline
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Does the 328 N52 need a 12 point thin wall socket?

Got 3 other styles of plug sockets, but not that one. LOL
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Old 04-10-2017, 08:19 AM
RWD-F10-N52 RWD-F10-N52 is offline
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Lol I'm not sure, early model n52's had a different style ignition coil setup from later models. You don't have a clip at the top that you wiggle on? It should just pull right out with some finesse.
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Old 04-10-2017, 09:40 AM
Greggie Greggie is offline
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I haven't started working on it yet. Coils won't be a problem, it's the spark plug socket I'm wondering about.
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Old 04-10-2017, 11:26 AM
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Pilgrim Pilgrim is offline
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Quote:
Originally Posted by Greggie View Post
I haven't started working on it yet. Coils won't be a problem, it's the spark plug socket I'm wondering about.
It takes a different socket. Order one with the plugs from an outfit like Bavauto.com.
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Old 04-11-2017, 09:35 AM
ZGator ZGator is offline
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I had a misfire, due to a bad coil - diagnosed the issue as misfire with diagnostic software, switched coil, and the misfire moved to the other cylinder.

I bought all new Ignition coils, plugs:
DELPHI GN10328 Ignition Coil $ 24.79 $ 0.00 6 $ 148.74
NGK 1208 Spark Plug $ 8.90 $ 0.00 6 $ 53.40
(rockauto)
and this plug socket:
https://www.amazon.com/GearWrench-80.../dp/B0014ZVSVK

Very happy with the change, I think mileage and power are a little better now.

My spark plugs did not look that great at 84k, so I think the 100k interval on plugs is too much for the N52 engines, 70k or less, and after research I decided to just replace all ignition coils - the bosch original have known issues.

I did go 100k with my M52tu engine in my Z3, and they looked pretty good at 100k, no coil issues on that with almost 150k..

Last edited by ZGator; 04-11-2017 at 09:39 AM.
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Old 04-15-2017, 11:54 AM
Greggie Greggie is offline
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Changed the plugs and coils yesterday. Was a lot easier than I thought, even with my right arm in a cast.
Plugs did not require a special socket, just a regular 5/8" plug socket. I did not have a socket with a magnet or rubber boot in it, so I used a flexible extended magnet to take them out. Only problem I had was putting the new plugs in, which I ended up using one of the old coils to start threading it in.
Car is running like a champ now. Thanks for all the input.
Color on old plugs is not bad for 70,000 miles, but the gap had increased to about .055.


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