If it's an '86 or newer I'd test the Temp II sensor.

On 1/12/09, Mark A Kippert <vanagon@kippert.com> wrote:
> I thought I had my problem solved after cleaning all my grounds and
> repairing some broken wires. I also replaced plugs cap and rotor. It
> was sporadic prior to the steps above then it cleared up. Now it's
> continuous.
>
> As soon as the temperature gauge starts to register the van starts to
> run rough, quickly looses power, then dies. I found that if I switch
> the key off, then right back on it will run fine for about 30 seconds
> then it starts over. As soon as I feel it running rough again, I turn
> the key off/on quickly and get another 30 seconds.
>
> It doesn't matter if I'm driving along or idling at a stop.
>
> Since I got the van I've noticed that it takes a good 10-15 minutes
> (or longer) to warm up. When warmed up, it's barely outside the "white
> zone" on the gauge. I had planned to replace the thermostat, but can't
> imagine this is the cause of the problem.
>
> It sounds like ECU is getting bad info from a sensor. Does this sound
> likely, and if so, what should I consider first.
>
> I did try searching the database but it timed out.
>
> Thanks for any suggestions as to where to start.
>
> -Mark K
>

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Chris S.
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