Anything is possible I suppose..
but my first thought is ..
a little extra heat is not going to affect those two electronicunits
unless they are really tired and 'ready.'
ECU's I find generally ..
quite long-lifed.  Those Idle Control Units though ..
   I've seen a ton of dead ones of those.

Just figure you had an extra effecient and fast piston rings break-inperiod.

I once heard this suggested for breaking in a motorcycle engine..
put WD-40 in the engine ...run it at max rpm for two minutes..
and the break-in period is finished.
  I havn't tried it  though.

Scott

On 10/11/2013 6:48 AM, John Meeks wrote:
> On Thu, Oct 10, 2013 at 10:53 PM, Scott Daniel <scottdaniel@turbovans.com>wrote:
>
>>   I wouldn't be too concerned about a short period of 3K no-load rpm.
>> If it was brand new rings or something ..then yes, but on a well used
>> engine that's fairly healthy, with decent oil in it, I wouldn't give it a
>> thought.
>>
> Thanks Scott,
>
> I DO have brand new rings. Did those a week ago along with the head
> gaskets.  OUCH!
>
> I'm wondering if the extra heat from 20 minutes of stop and go traffic had
> some effect on something in the idle control circuit or ECU like expanding
> solder joints or the like.
>
> John
>