More likely a loose sensor connection but check your plugs too. Fine wire Champions have a bad tendency toward cracked insulators which can turn them into "glow" plugs causing pre- ignition. Very bad.

Ron

On Aug 25, 2012, at 7:56 AM, "Lancair" <lancair-esp@ustek.com> wrote:

> Last week I had been cruising LoP and during the power back for landing
> Cyl #3 suddenly jumped 125F and sent the Chelton lady shouting into my
> ear.  That would not be unusual if I had failed to either further lean
> or go full rich but in this case I had leaned and the other 5 cylinders
> were OK.  I leaned way back and really lost power and then went full
> rich, and it finally settled down.  On the return flight I reduced power
> and carefully kept leaning and had no problem.   Yesterday it was deja'
> vu all over again.  Powered back on approach and only #3 went nutso
> until I leaned even more.  On the return flight there was no recurrence.
>
>
> Does this sound like a problem with the injector, with the thermocouple,
> or ? ? ?
>
> Robert Simon
> ES-P N301ES
> (TSIO550)
>
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