Date: Wed, 12 Apr 2006 16:27:07 -0400
Reply-To: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Subject: Re: 060412 AFM question
In-Reply-To: <000001c65e60$2f42dbe0$e1e4fe42@jbeauliexp>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
OBD= on board diagnostics.
basically a federally required port to be able trouble shoot fuel
injection and emissions related systems. the oxygen sensor generates it
own voltage and uses the exhaust for its ground. so if you have a one
wire sensor you attach one lead to the wire and the other to good ground.
how exactly you would be able to use a thimble type sensor on a vehicle
that did not utilize the sensor in the original fuel injection i do
not know. i would guess how ever that they used the same ecu for vehicles
with and without oxygen sensors so it might just be a matter of adding
another pin to the ecu connector.
like i said before wide band sensors are the way to go. you should be
able to google that and get more information than i can provide you with.
jonathan
On Wed, 12 Apr 2006, jake beaulieu wrote:
> Yeah, all the shops told me that exactly that, although I have no idea what
> OBD fuel injection means. I have already welded in an O2 sensor bung. I
> had intended to use it as a port to access the exhaust gases for CO and CH
> measurements, but maybe I think I'll take your advice and drop an O2 sensor
> in there. Does the O2 sensor need to receive 12V power, or does it generate
> its own voltage?
>
> Thanks,
> Jake
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
> Jonathan Farrugia
> Sent: Wednesday, April 12, 2006 1:16 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: 060412 AFM question
>
> with the advent of OBD most of the shops have ash canned their old
> equipment. the dealer here still has their old emissions machine but it
> barely works and only one or two people know how to use it. probably the
> easiest thing to do is to go to an exhaust shop and have them cut you in a
> whole for an oxygen sensor and weld in a bung then you could use an oxygen
> sensor to tune. all the do it yourself injection systems are going to
> wide band sensors for tuning as they are much more accurate than thimble
> type sensors.
>
> jonathan
>
> On Wed, 12 Apr 2006, jake beaulieu wrote:
>
>> So how in the heck are you supposed to have any idea what you are doing to
>> the air:fuel mixture when tweeking the AFM if you are not analyzing the
>> exhaust gases right away? I have been to 5 different shops this morning
>> trying to find someone to measure the CO and HC in my exhaust on my 82 air
>> cooled Westy so that I can set the AFM (I think I am running rich).
> Nobody
>> wants to touch it. I have the Federal model motor so no oxygen sensor to
>> use as a guide.
>>
>> Thanks,
>> Jake
>>
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
>> Ryan Dunn
>> Sent: Wednesday, April 12, 2006 10:07 AM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: Re: 060412 AFM question
>>
>> I noticed the same thing over the weekend! Whenever I "stabilized" it at
>> idle with a short screw driver, the idle would settle down. Made me
> wonder
>> if it supposed to dance around like that.
>>
>> Ryan
>>
>> "Greenamyer, William L" <william.l.greenamyer@BOEING.COM> wrote:
>> Over this last weekend, I did some smog adjustments. One of those was
>> tweeking the AFM. For those of you who have experience with the AFM,
>> should the wiper be moving (jitter or oscillation) of about 1/8 to 3/16
>> of an inch at idle or should the wiper be pretty stable?
>>
>> William
>>
>>
>>
>> ---------------------------------
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>
>
>
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