Date: Fri, 6 Jun 2003 13:42:01 -0400
Reply-To: Tim Demarest <tim.demarest@POBOX.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Tim Demarest <tim.demarest@POBOX.COM>
Subject: Re: Air Flow Meter;
In-Reply-To: <OF088A509F.F5E56F52-ON85256D3D.005A9193@lvs.dupont.com>
Content-type: text/plain; charset=us-ascii; format=flowed
I concur with Jay, just went through this with my '85...
By slowly pressing down on the gas in neutral, I could achieve any
speed between 850
and 1000, or above 2800... there was nothing available in between. This
made backing out of the driveway an adventure (to say the least). I checked
all the usual suspects, including pulling the AFM boot to check for cracks.
Everything appeared OK.
Pulled the airflow meter, hooked up an analog ohmmeter, and found
a large dead spot in the resistance measurement when moving the air vane...
it looked enough like the large dead spot in my accelerator pedal that I
gambled the $280 on a replacement from Bus Depot. Problem solved!
Tim
At 12:32 PM 6/6/2003 -0400, Jay L Snyder wrote:
>I still say the best way to check out your AFM is to slowly increase the
>engine speed with your foot on the pedal and see if you can hold it steady
>at various speeds. My old AFM would not. The new one does. And yes, I
>have taken the top off of brand new AFM to tinker with it. It is easily
>reset to the original setting. Very easy to go a little richer or leaner
>by adjusting the spring tension.
>
>
> Jay
>
>
>
>
>zampano <matthias.k@ATTBI.COM>@gerry.vanagon.com> on 06/06/2003 12:11:44 PM
>
>Please respond to zampano <matthias.k@ATTBI.COM>
>
>Sent by: Vanagon Mailing List <vanagon@gerry.vanagon.com>
>
>
>To: vanagon@GERRY.VANAGON.COM
>cc:
>Subject: Re: Air Flow Meter;
>
>
>I just got one from BD, new Bosch unit for $280.00. Can't beat that!!!
>It was for my 84 WBX Man Wolfy with a deadbeat engine/head rebuild done
>by a Southern California deadbeat shop, (but that's another story:)
>
>Why do you suspect the AFM???
>
>In fault finding, the AFM and/or ECU are the last ones to be the
>culprit, if they are, it means you'll find out only after you checked
>and ruled out any other possible problems involving Digifant/Digijet,
>the ignition and fuel supply. PITA.
>
>The static test in the Bentley might tell you your AFM is still "good"
>since it is a limited test. It did so with mine, even though it was
>bad, bad, bad.
>
>You can dig up my hodgepodge with the AFM in the archives, last month
>or so.
>
>Happy Trails for the weekend everyone
>
>Cheers
>
>matthias
>
>
>On Friday, June 6, 2003, at 08:13 am, Doktor Tim wrote:
>
> > At 07:46 AM 06/06/2003, you wrote:
> >
> >> At 10:22 AM 6/6/2003, John C. wrote:
> >>> Does anyone know if the (VW) air flow meter cap,
> >>> is supposed to just pop off?
> >>> I`m prying kinda hard,
> >>> & it`s not budging! :)
> >>
> >> They're a very light press fit -- grooved top fits over the aluminum
> >> lip. But they're also sealed with a very tenacious silicone RTV.
> >
> >
> > What this proves is they were not designed to be serviceable, which is
> > what
> > it says in the Bentley and which is why Bosch Corp offers no
> > remanufactured
> > units for them. When the spring starts to soften or the fuel pump
> > points
> > get worn or the reference tracks and pickups get worn or corroded, the
> > only
> > factory fix is to replace it. That is a hard pill to swallow. I just
> > priced
> > one for early Vanagon air cooled and list is $475. At my cost I can
> > only
> > knock about $50 off that. But it is the 10 to 20 year solution.
> >
> > Can't fault those who know better and invest tinkering time with no or
> > short range results, then spend the actual money for an actual fix.
> > Used
> > from a junker is an alternative however don't pay a dime for such
> > without
> > first confirming the static tests given in Bentley. Of course, you
> > should
> > also run these tests on your own unit BEFORE removing the top for
> > tinkering. Never pay a dime as well for any that have had the top
> > removed
> > for in many cases there the results will be nada.
> >
> > I do know that perfectly good AFM's get their tops pulled and tinkered
> > with
> > and turned into boat ballast. Shoot, $400 for no good reason is no way
> > to
> > care for your cost/mile over life.
> >
> > Verify per procedures given before opening your wallet.
> >
>
>
>
>
>
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