Date: Sat, 28 Apr 2007 14:14:30 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Ground for o2 sensor and ECU
Content-Type: text/plain; format=flowed
That ground connection on the oil tower is a bad idea. I usually move it to
one of the screws for the fuel pressure regulator. Metal on both sides.
Also, carefully check the crimp connection. it can look good but those
corroded wires do not make a good connection. Replace it with a terminal
with the heat shrink and adhesive sealant built in. Better yet, a sure
connect which also has an ally solder that will melt when the heat shrink is
melted. Also, the oil tower usually has metal inserts in those holes to
prevent over tightening. It is a breather separator. Allows vapor out but
lets the oil liquid drip back down.
Dennis
>From: Raymond Paquette <raymondpaquette@GMAIL.COM>
>Reply-To: Raymond Paquette <raymondpaquette@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Ground for o2 sensor and ECU
>Date: Sat, 28 Apr 2007 09:01:49 -0700
>
>Hello
>
>I have a question on the theme of 02 sensor grounds.
>
>I just redid mine (2.1). It seemed like a recipe for a bad connection to
>have the nut bearing down on the ground also be bearing down on the plastic
>(what is that black plastic tower? a vent?), because tightening the nut
>down
>only crushed the plastic.
>
>So I tightened one nut down sufficiently to hold the plastic tower, then
>tightened down a 2nd nut against the first, with a toothed washer and the
>ground between.
>
>Seems like a better way to go. Am I missing something, or did I just add
>unnecessary complexity? Or somehow make thngs worse?
>
>I can't tell anything from the running of the engine, since it was doing
>okay before, and hasn't changed. The ground was just on the list of things
>to make sure about.
>
>As often, I bow to the wisdom of the list.
>
>Raymond
>
>
>On 4/27/07, Mark Drillock <drillock@earthlink.net> wrote:
>>
>>Keep the O2 sensor ground separate and on the engine! Connecting it's
>>ground to other grounds creates the possibility that voltage returning
>>to ground from one of the other sensors will contaminate the O2 ground.
>>When grounds are bundled together at a single point there is danger that
>>some or all will start to float together away from the true ground. When
>>this happens, and it very often does in automotive life, the current
>>flowing through one or more sensors can raise the voltage at the
>>floating point and thus ruin the ground reference that the more
>>sensitive sensors rely on. The o2 sensor needs a clean and true ground
>>or it will mislead the ECU into misadjusting the mixture.
>>
>>Mark
>>
>>Todd Last wrote:
>>
>> > Does it make any sence to have the O2 sensor, ECU and any other
>>critical
>>sensor gounds all ground at the same point? Or are you risking a ground
>>loop by doing this?
>> >
>> > With the problems with the ECU and O2 sencor and grounds, I was
>>wondering if making an alternate ground path that both are tied to would
>>be
>>a good idea or not?
>> >
>> > In my Van, the DPO crimped on an extra ground which is simply screwed
>>into the sheet metal under the seat.
>> >
>> >
>> > Todd
>> > '88 Westy
>> >
>>
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