Date: Wed, 4 Apr 2001 08:15:46 -0700
Reply-To: Todd Last <Rubatoguy@MINDSPRING.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Todd Last <Rubatoguy@MINDSPRING.COM>
Subject: Re: Working ranges for Temp sensor and AFM
Content-Type: text/plain; charset=us-ascii
That was not the case with the new/rebuilt AFM that I got.
See photo at: http://rubatoguy.home.mindspring.com/newafm.html
Though I was thinking that if I added the capacitor fix I'd install in
internally rather than in the wiring.
One thing that I have noticed with the new AFM - and I'm not sure if this is
just having the CO unadjusted, that the throttle seems to be less 'crisp' and
less oooph. I'm wondering if the initial adjustment of the new AFM is lower, so
that over all rpms the motor is getting less fuel.
Todd
'88 Westy
Jay L Snyder wrote:
> Your numbers match what I measured last night on my old and new AFM. I
> noticed the new AFM has what appears to be a capacitor fix built right into
> the center pivot contact. It has a plastic (insulated) contact, with a
> small black rectangular in-line gizmo. From it is a wire that then is
> connected to the large metal arm that goes to the pin connectors. Anyone
> else seen this? Across pins 2 + 3, I measured 700 ohms up to about 1200
> at mid point, and then dropping to 550 ohms by the end of the vane travel.
> Across 2 + 4, I measured ~28 ohms, rising to about 1000 ohms and then
> stays there for the rest of the travel. Across 1 + 4 was 3000, which is
> about right for the outside temp of 60F or so.
>
> Jay
>
> James Creech <jacreech@VISUALLINK.COM> on 04/03/2001 10:30:18 PM
>
> Please respond to James Creech <jacreech@VISUALLINK.COM>
>
> To: vanagon@GERRY.VANAGON.COM
> cc: (bcc: Jay L Snyder/AE/DuPont)
> Subject: Re: Working ranges for Temp sensor and AFM
>
> Content-type: text/plain; charset=iso-8859-1
> Content-transfer-encoding: quoted-printable
>
> The Bentley graph shows, for both sensors (approx.):
> 0C / 32F 5-6k ohms
> 10 / 50 3.5-4k
> 20 / 68 2.5-3k
> 30 / 86 1.5-2k
> 40 / 104 1-1.5k
> 50 / 122 700-900
> 60 / 140 550-650
> 70 / 158 400-500
> 80 / 176 300-370
> 90 / 194 220-290
> 100 / 212 180-220
> The AFM pin resistances are (4 on left to 1 on far right, looking into =
> the
> pin housing):
> 3 and 4 500-1000 ohms (total resistance of the pot)
> 2 and 3 ohms fluctuate as vane is opened (resistance thru wiper)
> 1 and 4 ohms according to table above (intake air temp sensor - temp=
> 1)
>
> ----- Original Message -----
> From: David Beierl <dbeierl@ATTGLOBAL.NET>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, April 03, 2001 7:13 PM
> Subject: Re: Working ranges for Temp sensor and AFM
>
> > Ah -- gotcha. I'll answer tomorrow unless someone else does, don't h=
> ave
> > Bentley with me right now. At equal temperatures, though, the Temp I=
>
> > sensor in the AFM should measure about the same as the Temp II sensor=
> in
> > the motor, the specification is the same. Very roughly, from several=
>
> > kilohms cold to a few hundred ohms or less hot.
> >
> > If you measure voltages, though, the AFM should run smoothly from zer=
> o to
> > about five volts (with ECU connected and ignition on) as you open the=
>
> > flap. I don't have pinouts, but there is a ground lead, a +5 volts
> lead,
> > the wiper lead, and either one or two for the Temp I sensor. The tem=
> p II
> > sensor should be ?a volt or two? cold, and down around one or two ten=
> ths
> of
> > a volt warm.
> >
> > david
> >
> >
> >
> > At 03:35 AM 4/3/2001, Javier wrote:
> > >I am trying to help a friend with his van; we disconnected the
> Temperature
> > >sensor after feeling that idle was errant, and,.... it worked (altho=
> ugh
> with
> > >slighty high rpm=B4s).
> > >That is why I would like to know in which ranges (ohms) does this se=
> nsor
> > >work in order to find if this is malfunctioning and so, we will repl=
> ace
> it.
> > >(Will use a multitester)
> > >
> > >Regarding the AFM (Air Flow Meter), it is my friend who thinks it is=
> the
> > >defective one.
> >
> > David Beierl - dbeierl@attglobal.net
>
> =
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