A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

removed spark plug and found missing prong....should I assume it melted or i have a piece floating

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Old 10-20-2008, 10:29 AM
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Default removed spark plug and found missing prong....should I assume it melted or i have a piece floating

around - if so, what should I do? These were NGK iridiums - about 1 year old
Old 10-20-2008, 10:49 AM
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Default It's possible it exited the exhaust valve

if so, it could have hit the turbo.
Old 10-20-2008, 10:51 AM
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Default The missing piece is long gone.

It DID go out the exhaust and through the turbo on that side..the only question is how much damage did it do. If you don't have bad noises (damaged turbine can be out of balance) just keep going.

OTOH, if your car is still under warranty and the dealer did the spark plug change, have the dealer inspect the turbo for damage as well as the head (IIRC you said the plug was loose when you removed it).

If the turbine is damaged/out of balance, the warranty should cover it.
Old 10-20-2008, 10:59 AM
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Default Eek, is everything running correctly?

The vulnerable parts would be the valves/seats and turbos (well, only one really, but I digress). Hopefully the missing prong bounced between the valves and the turbine blades...and is either sitting atop the pre-cat or has already been cooked away.
Old 10-20-2008, 04:17 PM
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Default

That's only assuming it came off at once.
Old 10-21-2008, 02:53 AM
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Default

This is one reason why these three earth plugs should never be adjusted.
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