I did sort out the screwed up wiring and for about a month everything
ran fine...until now. I will try disconnecting the O2 the next time
and see what happens.

Mark K
'86GL 2WD

On Jan 12, 2009, at 12:48 PM, mdrillock wrote:

> Your earlier posts about your engine wiring problems had a photo that
> showed wires connected to the wrong things. I hope you found a similar
> year van to compare yours to as those wires should not be left
> connected
> the way the were.
>
> The suggestion to unhook the main wire to your OX sensor is the
> place to
> start for your current problem. This won't prove a problem with the OX
> sensor but could at least make it so you can drive it while later
> figuring out the real problems. The ECU uses the readings from the OX
> sensor to tune the fuel/air mixture. When the sensor is unplugged the
> ECU stops trying to tune the mixture and instead relies on a default
> fuel mixture from its internal program memory. This can make it seem
> to
> run better but sometimes causes much higher fuel use.
>
> Mark
>
>
>
> Mark A Kippert 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
>>
>>