Yes the injectors are only off above 2000 rpms on deceleration.  Below
that they come back on.  I have a digitool and have observed this myself
many times.  So if you can somehow get the rpms down a bit this would
help (like having the engine at idle by depressing the clutch pedal
should work).

Ken Wilford
John 3:16
www.vanagain.com

Allan Streib wrote:
> Geza Polony <gezapolony@SBCGLOBAL.NET> writes:
>
>
>> Here's my idea. When you're coasting downhill, you're using the
>> engine as a brake. This means that above 1500 RPM, with the idle
>> switch closed, the engine isn't getting any gas, as the ECU has shut
>> the injectors down. If it isn't getting any gas, it also isn't
>> producing any heat. The engine is functioning as a brake, but there
>> isn't any combustion, and so, after a period of 10 minutes or so in
>> freezing temperatures, the coolant loses temperature, and your gauge
>> is way off the edge of the scale.
>>
>
> Makes sense.  Not only is there no combustion but you are flushing
> cold outside air through the cylinders, which has a further cooling
> effect.
>
>
>> I tested this by going downhill, engine warm, and taking my foot off
>> the gas to coast. I could see the gauge move colder before my
>> eyes. Give it a little gas, and the engine warms up. This is kind of
>> tricky from a driving standpoint, but it works.
>>
>
> Now, repeat the experiment with the clutch in, so the engine is
> idling, not being overrun.  See if it stays warmer.
>
> Allan
>
>