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      01-27-2010, 09:30 AM   #1
aesfah
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Engine coil failure & cylinder misfire

My wife called and said the car was shaking really bad at stops and low-speeds and the CEL was on. Dealer diagnosed problem as bad engine coil #3, leading cylinder #6 to misfire. They replaced the coil and everything's fine now. Just wondering,
1) what could've caused this;
2) is this any indication of future coil problems; and
3) should I have insisted the dealer replace the spark plugs?

On a side note, both this and a vanos cover/gasket leak was covered by my CPO warranty.
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      01-29-2010, 04:44 PM   #2
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bump...anyone?
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      01-29-2010, 06:56 PM   #3
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Had this problem on my old Maxima. This was a very common issue. No indication it will go and sometimes it just resets itself. What is described is exactly what happened on my car. 3 got replaced under warrany and then I ended up fixin 2 others as needed. In my old car, they were bad units out of the factory. Think HPFP but with coil packs on the 99 Maxima's. As of the spark plugs, mine all got changed when they replaced the first 3, and then I did it again when I changed the 2nd one, but alas, they needed replaced anyway.

Id chalk it up to a bad unit and you got it. Just keep an eye on it.
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      01-29-2010, 07:25 PM   #4
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Quote:
Originally Posted by aesfah View Post
... Dealer diagnosed problem as bad engine coil #3, leading cylinder #6 to misfire. They replaced the coil and everything's fine now. Just wondering,
1) what could've caused this;
2) is this any indication of future coil problems; and
3) should I have insisted the dealer replace the spark plugs?
...
1) It just happens. The "coil" produces a fairly high voltage for its size - it may fail, but it does not fail very often. From the point of view of ignition voltage delivery, the new system is better than the old one that used a distributor.
2) No.
3) No.
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      01-29-2010, 07:51 PM   #5
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Yup, don't worry. Had this problem with my 03 330i, they replaced (multiple) coils, and all was fine.
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      01-29-2010, 08:01 PM   #6
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I should have added in my answer above that you should not worry. IMO, what you had was an isolated bad luck event, and your ignition will be OK now.
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      01-29-2010, 08:14 PM   #7
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Just had this on my '06 330 had a misfire in #5 and replaced the coil. Kinda think of it as a light bulb, it has the chance to eventually blow.

Damn it was covered under CPO, figured it wouldn't, i did it myself could of saved $80
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      02-19-2010, 08:17 PM   #8
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i started having this problem abou two weeks ago...ive just been driving really easy as not to harrase my 2006 330i..out of warranty but i forgot i purchased an extended warranty and now its covered. cars in shop now replacing ignition coils 3 and 5 .i hope this doesnt happen again...thanks for information..really love this forum...solid infromation available here
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      02-19-2010, 09:06 PM   #9
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Quote:
Originally Posted by bim View Post
i started having this problem abou two weeks ago...ive just been driving really easy as not to harrase my 2006 330i..out of warranty but i forgot i purchased an extended warranty and now its covered. cars in shop now replacing ignition coils 3 and 5 .i hope this doesnt happen again...thanks for information..really love this forum...solid infromation available here
Usually it is just one coil that fails, but with BMW diagnostics and warranty you have, I would take both coils if they are offered. You usually find that the cars with the problems caused by high voltage breakdowns are most objectionable at idle, because the spark is hottest at low engine speeds and the irregularities is most noticeable. Good luck with your 330i - it has a really sweet engine.
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      02-20-2010, 06:24 AM   #10
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Quote:
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...Good luck with your 330i - it has a really sweet engine.
+1

It's special indeed.

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      02-20-2010, 11:58 PM   #11
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For what its worth:

Last summer I was going through Kentucky near Lexington at a pretty good pace when the dash lit up like a Christmas tree, followed by limp mode. Managed to get into Knoxville and took it to the dealer.

Misfire codes were thrown on a couple of the cylinders. SA initially thought HPFP, but they rattled around the coil assemblies, swapped units between cylinders, cussed and spit a little bit, and sent me on my way. I've not had any issues since. Happened with 1600 mi. on the clock.

As I understand it, if the coil unit works or gets loose or isn't seated tight, it's enough to make things go gunny sack quickly. SA seemed to indicate, while not common, it's not unheard of either and didn't portend future problems. If it didn't need plugs prior to problem, it didn't need plugs post-problem.
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      02-21-2010, 12:18 AM   #12
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Quote:
Originally Posted by Nightfly View Post
For what its worth:

Last summer I was going through Kentucky near Lexington at a pretty good pace when the dash lit up like a Christmas tree, followed by limp mode. Managed to get into Knoxville and took it to the dealer.

Misfire codes were thrown on a couple of the cylinders. SA initially thought HPFP, but they rattled around the coil assemblies, swapped units between cylinders, cussed and spit a little bit, and sent me on my way. I've not had any issues since. Happened with 1600 mi. on the clock.

As I understand it, if the coil unit works or gets loose or isn't seated tight, it's enough to make things go gunny sack quickly. SA seemed to indicate, while not common, it's not unheard of either and didn't portend future problems. If it didn't need plugs prior to problem, it didn't need plugs post-problem.
Good point - all the coils have to be seated the same way and the fit is quite tight. Most of these problems tend to happen on low mileage cars. I am not sure if BMW recommends to apply dielectric fluid or grease when seating the coils, but most high voltage connectors use one or the other. In any case, once the problem is solved, it rarely returns during the lifetime of the spark plugs. With the car diagnostics, it is not a guessing game - it can be tracked using a scanner and fixed.
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      02-23-2010, 01:29 AM   #13
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You guys are LUCKY it was under warranty. My warranty expired only in November.

Had all the same symptoms described above just yesterday. Shaking, Service Engine Soon... Only 28k miles on my mildly driven 2006.

Bad ignition coil. Dealer in SF hit me for $650 (about $520 in labor). Had I opted out of the repair, I would've owed about $300+ in diagnostics, plus I don't have a 2nd car, so I just needed it back. Shouldn't they buy you a drink before they "F" you like that?!?

Good to hear the problem is not historically a recurring one.
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      02-23-2010, 01:50 PM   #14
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Quote:
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Shouldn't they buy you a drink before they "F" you like that?!?
Only if you're hot.
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      01-26-2011, 01:22 PM   #15
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change your plugs, ignore BMW service recommendation

as the plugs age gap gets bigger, requires more voltage resulting in coil
failure
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      01-26-2011, 01:23 PM   #16
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Change to Peter Pan

Quote:
Originally Posted by Moz_e90 View Post
You guys are LUCKY it was under warranty. My warranty expired only in November.

Had all the same symptoms described above just yesterday. Shaking, Service Engine Soon... Only 28k miles on my mildly driven 2006.

Bad ignition coil. Dealer in SF hit me for $650 (about $520 in labor). Had I opted out of the repair, I would've owed about $300+ in diagnostics, plus I don't have a 2nd car, so I just needed it back. Shouldn't they buy you a drink before they "F" you like that?!?

Good to hear the problem is not historically a recurring one.
Payed 125 for a new coil at Peterpan today...ask for Jeff Johnston BMW SF SUCKS
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      01-26-2011, 01:31 PM   #17
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I had my car diagnosed and 2 coils replaced before on my old 325i, for a bit over $300 including labor.

People in SF, in you need car maintenance for cheap let me know, I know a great place to go.
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      01-26-2011, 02:57 PM   #18
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Quote:
Originally Posted by Moz_e90 View Post
You guys are LUCKY it was under warranty. My warranty expired only in November.

Had all the same symptoms described above just yesterday. Shaking, Service Engine Soon... Only 28k miles on my mildly driven 2006.

Bad ignition coil. Dealer in SF hit me for $650 (about $520 in labor). Had I opted out of the repair, I would've owed about $300+ in diagnostics, plus I don't have a 2nd car, so I just needed it back. Shouldn't they buy you a drink before they "F" you like that?!?

Good to hear the problem is not historically a recurring one.
See my sig., you need to invest in one of those tools.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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      01-26-2011, 03:23 PM   #19
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Sounds like it may be smart to keep a spare coil pack in the trunk. Maybe someone could start a Group Buy from one of our vendors?
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      01-26-2011, 03:26 PM   #20
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good to see this was covered under CPO. My car has a Misfire on Cylinder 3 and its shaking like im driving down a bumpy ass road.. Called the dealer and I'm taking it in tomorrow ( after i remove my mods of course )
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      01-26-2011, 03:45 PM   #21
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I had this same problem. They changed out the coil and the plug. Very next day it was having the same symptoms. Found out it was the fuel injectors and my car was not on the tsb for injectors. Six new plugs and injectors later she's finally running.
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      01-26-2011, 04:17 PM   #22
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I have the same thing now...the car shakes like crazy.
I'm starting to see a trend in this 3 series.
N54 has its issues anytime that we all know but the N52 starts having issues also after 100,000 Km.
I mean from all the posts, it's a combination of valve cover leaks due to broken bolts. ignition coil, injectors, transmission oil leaks, ....
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