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.

not quite the same engine..
and, the official way to adjust the max rpm,  per Bentley, on a diesel
vanagon engine is set the max throttle lever stop screw at 5,050 rpm (
or something close to that ) and take the reading and do the adjustment
with no loadat that rpm.

On 10/10/2013 7:09 PM, John Meeks wrote:
> Right Stuart...
>
> I've checked that nothing in that linkage is jammed or stuck. AND it
> stopped happening after a cooldown.and restart but not after a momentary
> shutdown.
>
> I have the Digifant Pro Training manual on my phone. That's logic. I like
> Scotts' idle control unit idea . Pro Training has s page on that.
>
> 3000 RPM with no load for more than a few seconds IS pretty disconcerting.
>
> John
> '
>
>
> On Thu, Oct 10, 2013 at 9:35 PM, Stuart MacMillan <stuartmacm@gmail.com>wrote:
>
>> Definitely follow logical troubleshooting procedure, which means check the
>> simple stuff first.  That's always the mechanical things you can see and
>> feel.  Electrons are only detected by magic.
>>
>> I've had this happen and it was something that dropped on the throttle
>> lever
>> and jammed it.  Broken cruise control cable I think. The good thing is the
>> ECU will cut off the injectors before the engine self-destructs!
>>
>> At least that's what happened in my case, but at the time I thought I
>> destroyed it.
>>
>> Stuart
>>