Date:         Sun, 1 Mar 2015 15:53:05 -0600
Reply-To:     Kevin Duvernay <kduvey@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Kevin Duvernay <kduvey@GMAIL.COM>
Subject:      Re: 87 2.1 dies after 30 seconds
Comments: To: mark drillock <mdrillock@cox.net>
In-Reply-To:  <54F0F823.9080004@cox.net>
Content-Type: text/plain; charset=UTF-8

ding ding ding and the inner is: Mark.

Thank you Mark. It was in fact the O2 sensor ground wire (green slightly
larger gauge wire). Someone had mistakenly plugged it into the unused spade
connector on the bottom of the coil because it was just sitting there
unplugged while the O2 sensor was out. Unplugged it from the coil and it
runs beautifully now. The new O2 sensor also seems to have solved the
running rich problem.

Should have consulted the list before spending many hours swapping out so
many parts...

On Fri, Feb 27, 2015 at 5:05 PM, mark drillock <mdrillock@cox.net> wrote:

> This sounds like it could be related to the oxygen sensor circuit. When
> the engine is cold the ECU ignores the O2 sensor. Once the engine warms up
> to a certain point the ECU then tries to use the O2 sensor reading as a
> basis for adjusting the fuel mixture. It has a lot of leeway in trying to
> adjust it and can easily adjust it so far that the engine stops running.
> When you turn the key off and then start the engine again the ECU again
> ignores the O2 sensor but only briefly. So with an already warmed up engine
> restarting clears the O2 sensor circuit for a short while each time. With a
> cold engine the O2 circuit is inactive until the engine warms up.
>
> If it is related to the O2 sensor circuit it could be the sensor, the
> wiring to the sensor, or the reference ground wire the ECU uses when trying
> to read the sensor. The reference ground wire is the brown wire that comes
> out of the small bundle that goes to the distributor connector. People see
> this brown wire and assume it has to do with the distributor but no, it is
> for the ECU O2 circuit. It needs to connect to engine metal and needs a
> clean connection and no other ground wires should share that connection.
>
> Mark
>
> Kevin Duvernay wrote:
>
>> I do have a spare brand new temp II sensor, we'll try tossing it in. easy
>> enough. I suppose it make sense, it actually does seem to run good for
>> several more minutes if its started cold...?
>>
>> On Fri, Feb 27, 2015 at 4:28 PM, Jim Felder <jim.felder@gmail.com> wrote:
>>
>>
>>>