Date: Wed, 14 Nov 2012 14:10:59 -0800
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: 2.1 strange running before and after head gasket repair
In-Reply-To: <CAFnDXk0i7nkXsy0_gRtEDbDduAUQ+GAnbsikia1aATiiNidhfA@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
that's what it takes ..
thinking about it in detail ..
as opposed to throwing parts at it.
the more you understand the principles at play,
the easier it is to fix 'em.
the whole system is kinda simple and fun actually.
Not very tricky or complicated once understood.
On 11/14/2012 1:29 PM, Jim Felder wrote:
> What I'm getting out of all these comments makes perfect sense, never
> thought about it in detail before... the O2 or Temp II sensors could be
> bad, but so could the wiring between the sensors and the ECU and the
> grounds. A poor connection at the plug, a poor connection in a ground, or a
> faulty wire could fool the ECU into thinking that it needed to enrich the
> mixture.
>
> Jim
>
> On Tue, Nov 13, 2012 at 9:16 PM, Scott Daniel - Turbovans <
> scottdaniel@turbovans.com> wrote:
>
>> high resistance in the ground side would be seen as the ECU has higher
>> ohmage..
>> which equates to richer mixture ..
>> might want to check the resistance to ground on that ( probaby ) brown
>> wire.
>> on temp sensor II.
>>
>>
>> On 11/13/2012 6:45 PM, James Felder wrote:
>>
>> Thanks, Dennis. This all makes sense.
>>
>> Jim
>>
>>
>>
>> On Nov 13, 2012, at 8:23 PM, Dennis Haynes <d23haynes57@hotmail.com> <d23haynes57@hotmail.com> wrote:
>>
>>
>> If you quickly reset the ignition does it clear up for a little while? If so
>> the problem is in the o2 sensor wiring. If not then look at temp 2 sensor.
>> The temps 2 sensor rarely goes bad but the plug connection to it is a real
>> problem. Most sensor replacements actually are fixed by the
>> disconnect-reconnect action cleaning the contacts. One side of the temp 2
>> sensor goes to a ground point. Any high resistance in the wiring is an issue
>> especially with this sensor being shared with the idle speed controller.
>>
>> Dennis
>>
>>
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com <vanagon@gerry.vanagon.com>] On Behalf Of
>> Jim Felder
>> Sent: Tuesday, November 13, 2012 9:38 AM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: 2.1 strange running before and after head gasket repair
>>
>> Not that anyone has been following this, but my daughter let the engine get
>> overheated on my 91 2.1 when the Temp II sensor retaining clip broke and
>> immediately emptied coolant. The head gaskets leaked and the thermostat
>> housing was warped, primarily, but I had some other troubles along the way
>> like a cylinder frozen to one of the heads.
>>
>> Anyway, I made a mistake by letting a wire get caught under the driver side
>> rubber gasket, which cases coolant to pool on top of the cylinder. I can
>> take care of that. The engine, though, is exhibiting symptoms that I thought
>> I would ask about.
>>
>> It was doing the same things before the overheating and gasket issues, so I
>> anticipate some troubleshooting will be in order when I get the gasket leak
>> repaired. Before I found the head gasket leak, I was able to run it to warm
>> and then drive it for three or four miles, so I can observe that the post op
>> problems are the same as the pre-op problems with the exception that the
>> effects of the leaks, except for the mistake on the DS rubber gasket, are
>> fixed.
>>
>> Here's what's going on: when I start the car, it runs great. It just purrs
>> strongly and steadily, until it gets warmish and then it begins stumbling
>> and issuing some black exhaust like it's running rich. If you let it idle,
>> especially with it in drive and there's that little bit of extra drag, it
>> will stall. It does the same thing with the O2 sensor plugged in or
>> unplugged.
>>
>> Any ideas?
>>
>> Jim
>>
>>
>>
>>
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