Update. I pulled the Temp II sensor. It didn't die but it idled at
about 3000RPM and had poor power so I plugged it back in.

I then unplugged the O2 sensor. It ran like a charm and did not die.
As a matter of fact, it runs better now than it has since I bought it.
The idle has always been around 1100RPM after warmup (higher when
cold) and now it hovers around 800RPM. Nice and smooth!

Looks like I need a new O2 sensor. Oddly the one in there was fairly
new and couldn't have more than a couple thousand miles on it per the
PO. I did note that he had spliced the current sensor into the
existing wires. Obviously not an OEM part.

Thanks for the input!

Mark K
1986 GL 2WD

On Jan 12, 2009, at 2:18 PM, Mark A Kippert wrote:

> The PO replaced it within the last couple years but I'll try it and
> see.
> -Mark K
> '86 GL 2WD.
>
> On Jan 12, 2009, at 12:33 PM, Mike Miller wrote:
>
>> O2 sensor?
>>
>>
>> On 1/12/09 7:52 AM, "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
>>
>>