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  #11  
Old 04-24-2019, 03:34 PM
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I wouldn't veto the idea of grabbing a couple used from a pick n pull yard to toss in the trunk. It sure was nice to have the hand me down ready to throw in when wife's car was repeatedly throwing misfires on the same cylinder.

Here a possible debugging tip: old crappy spark plugs rooted out weak coil packs like a metal detector and a coin. Maybe when about to change plugs mis set the gap on purpose to give the coils some extra work and detemine if any are weak.

Wife had repeated misfire one cylinder. Plug was completely gross so I changes plugs problem went away for months then came back. One cylinder.same cylinder (actually one over because I swapped 3&4 so I was pretty confident it was the coil). Replaced that coil then got some misfires on a second coil a couple days later. Swapped that coil and also ran some Lucas injector cleaner. No misfires since


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  #12  
Old 04-24-2019, 04:02 PM
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Agree that no need to replace the coils pre-emptively.

Best is to remove the cosmetic cover (save it on your garage shelf).
Then get a few good used coils (usually Bremi) from local junk yard or eBay and keep them in the trunk.
Then keep an inexpensive OBD code reader in the trunk.

This way you can quickly an error code and swap the coil quickly.
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Old 04-24-2019, 06:11 PM
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When I've had one go bad I could drive quite a bit on a reset so code reader most important I kept one of the weak coils in case of complete failure I can be operational but I'm going to look for a couple hand me down units


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  #14  
Old 04-24-2019, 06:16 PM
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IMO, there is no need to carry an extra coil. It's not like BMW coils have a high failure rate. Just do the preventative maintenance and drive on. If that concerned, when a coil goes bad and all are the same age, replace all of them.
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Old 04-24-2019, 06:44 PM
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Around town, no need to carry the spare coils.

On long distance trips, extra coil(s) is/are useful.
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Old 04-24-2019, 06:45 PM
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Correct but they won't take any space no reason to not keep with the spare tire


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Old 04-24-2019, 07:43 PM
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No need to defend your opinion. I just have a different opinion. Before I would carry a coil, I would carry belts or hoses and I don't do that either. Too many different things that can happen. I carry a basic tool kit and duck tape. Other than that I wouldn't know where to stop with spare parts. AAA is my peace of mind.
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Old 04-24-2019, 08:48 PM
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It's all relative to where and how far you're going. In the Middle East I carry tools, parts, floor jack, sand ladder, water, lights, oil, bribe money and shelter.

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Old 04-24-2019, 08:52 PM
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Quote:
Originally Posted by Meestahbig View Post
... coils either work or don't. I will change the plugs in a short while.
Thatís not entirely true. Coils, like all high energy components degrade slowly over time. After several years, they wonít be generating the same spark voltage as when new.

A degrading coil wonít strand you on the side of the road, but it WILL reduce spark energy which can reduce burn efficiency. That can eventually cause increased fuel consumption, fouled plugs, cat heating, etc.

Coils should be changed before they hit total failure, but WHEN is up to you. I just changed mine at 12 years and 160k miles. The performance increase was noticeable.

Use OEM which is Bosch or BMW.
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  #20  
Old 04-24-2019, 10:02 PM
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Quote:
Originally Posted by oldskewel View Post
. But it did seem a little sketchy removing them, so I'd be a little worried about leaving them in there indefinitely.
The first time you pull a plug and the seized threads come with it, will cure you forever of not changing plugs frequently. Repair is such a pain in the ass.
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