Broken Spark Plug - BMW K1600 Forum : BMW K1600 GT and GTL Forums
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post #1 of 32 Old 07-18-2019, 01:32 PM Thread Starter
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Broken Spark Plug

Not on the bike. On my Audi TTS Roadster. I got an EPC and CEL last night. Plus experienced massive loss of power.

I pulled the codes below, then planned to replace the plugs and coils as a simple first step, as I have spares from upgrading. Then I found the broken plug.

I'll need to find a scope to see if the broken piece is in the cylinder, and if the piston appears damaged. Outside of that, I'm open to ideas.

33 OBD-II

Trouble codes:
P0300 - Random/Multiple Cylinder Misfire Detected
Active
P0303 - Cyl.3 Misfire Detected
Active
P0304 - Cyl.4 Misfire Detected
Active
P0300 - Random/Multiple Cylinder Misfire Detected
Passive
P0303 - Cyl.3 Misfire Detected
Passive
P0304 - Cyl.4 Misfire Detected
Passive
P0301 - Cyl.1 Misfire Detected
Passive
P0300 - Random/Multiple Cylinder Misfire Detected
Active
P0304 - Cyl.4 Misfire Detected
Active
P0303 - Cyl.3 Misfire Detected
Active
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John
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post #2 of 32 Old 07-18-2019, 02:00 PM
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I know you don't want to hear this but, after inspecting with scope I'd try to retrieve broken pieces with a magnet , assuming the pieces are ferrous metal. If I couldn't account for all the pieces I'd pull the head and go from there.

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post #3 of 32 Old 07-18-2019, 02:08 PM
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are all the plugs arced as badly, would think like that paraffin to lube the cylinder and maybe draw out and lifted in to suspension fragments

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post #4 of 32 Old 07-18-2019, 02:52 PM
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If you see debris in a scope, try sticking a tube attached to vacuum into the cylinder and watch with the scope to suck them out. If you're lucky, they might even blow out by cranking with the plugs out. It looks like the plug was damaged by arcing, so the missing metal might have just vaporized.
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post #5 of 32 Old 07-18-2019, 02:57 PM
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I'm betting that any fragments of a broken plug would be ceramic and wouldn't fall inward because the metal plug portion is still occupying the entry way to the cylinder.
Unless you are telling me that the internals of the plug broke which I have never seen before.
Please confirm.

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post #6 of 32 Old 07-18-2019, 03:25 PM
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Obviously the engine was running when this happened and you ran it for some time after, so I'd bet the farm that the piece already got ejected thru the exhaust valve.
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post #7 of 32 Old 07-18-2019, 03:30 PM
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ugh. Good luck and best wishes for a positive and mostly painless outcome.

James

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post #8 of 32 Old 07-18-2019, 03:34 PM
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Quote:
Originally Posted by atc250r View Post
Obviously the engine was running when this happened and you ran it for some time after, so I'd bet the farm that the piece already got ejected thru the exhaust valve.
Yes agreed. Looks like the engine is heavily modified. Are you sure you run plugs with the right heat range?
Inspection with a bore scope is always good. You probably will find some marks on the piston top and the valves.

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post #9 of 32 Old 07-18-2019, 05:38 PM Thread Starter
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I hadn't considered that it may have arced itself into oblivion. I was assuming the piece broke. I'll take a closer look at the stump.

I videoscoped the cylinder and found no stray bits. I'm doing office work now, and plan to videoscope once more before putting back the pieces. I won't be doing any teardown. I'll have a shop do it if needed. I don't have the time or patience. It would take me weeks.

The engine had been missing a beat lately, and I had planned to investigate. So maybe that plug was already failing. The car was running at speed on the freeway at the time of power loss. I already ran it for miles afterward. Damage could already be done. Little I can add if I idle the engine as a test at this point.

The plugs are NGK Iridium BKR7EIX which is one temp range colder than stock. It's the plug of choice with the tune, and the same as I'm going to go put back in right now. Wish me luck.

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post #10 of 32 Old 07-18-2019, 07:07 PM
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What do the other plugs look like?
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