The best way to adjust is with an exhaust gas analyzer inserted before the
catalytic converter.  Next best way is to monitor the voltage output of the
O2 sensor - if you have one - with a voltmeter.  I believe I've read a "seat
of the pants" method - I think it's in the Bosch Fuel Injection manual - but
I don't have the book here to see what it says.  Yes the adjustment screw is
under the tamper-proof cap, and counterclockwise leans while clockwise
richens.  However, if you think you may have a leaking injector - Cold Start
or otherwise - run that down first before adjusting the AFM.
---------------------------------------------------------------
Tom Young                       '81 Vanagon
Lafayette, CA 94549         '82 Westfalia
---------------------------------------------------------------
----- Original Message -----
From: "Sean Garrett" <SEAN.GARRETT@ASU.EDU>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, February 20, 2004 8:36 AM
Subject: Re: 1981 flooding issue

Thanks Tom, the AFM was new 8 k ago with all the other FI on the engine.
Although it was reading high on the HCs a month ago. So maybe it is adjusted
to high. Is it possible for me to adjust it myself using 1/4 turn trial &
error method ? Is it the screw under the cap next to the "box" lid ? Which
way might I turn it ?

TIA
Sean Garrett
81 Westy (his)
95 EVC (hers)
87 Syncro (2.5L Subie project)
82 Parts Vanagon (need a part ?)
Central Arizona

> -----Original Message-----
> From: Tom Young [mailto:tomyoung1@comcast.net]
> Sent: Friday, February 20, 2004 9:35 AM
> To: Sean Garrett; vanagon@GERRY.VANAGON.COM
> Subject: Re: 1981 flooding issue
>
>
> From: "Sean Garrett" <SEAN.GARRETT@ASU.EDU>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Friday, February 20, 2004 6:54 AM
> Subject: 1981 flooding issue
>
>
> >My 1981 has had a issue for 3 yrs. It floods from cold start
> >or hot if I give it to much gas. Last night it left me stranded so
> >I must address the issue now. I have some ideas on how to
> >track down the problem and want to bounce them off some folks.
>
> >My questions are:
>
> >Can I disconnect the electrical connections from the Aux Air
> >Regulator and/or the cold start injector and will they remain in
> >closed position (not function). Instinct tells me that they are not
> >functioning right. Perhaps the Cold Start Injector is pumping gas
> >all the time ?
>
> You can disconnect the electrical connectors and that
> *should* stop both
> items from working.  I wouldn't disconnect the Aux Air
> Regulator since that
> isn't contributing to your flooding problem.  However, if the
> Cold Start
> Injector is suffering from mechanical failure then disconnecting its
> electrics might not stop it from injecting.  Gas is always
> flowing past the
> Cold Start Injector so if it's mechanically jambed in the
> "open" position
> it'll discharge gas irrespective of what the thermo-time
> switch is telling
> it to do.
>
>
> >The engine has 8k on a new rebuild and I replaced all the FI
> >stuff that is on the engine with new. All of the FI stuff on the
> >firewall is old and seems to be functioning fine. I am going to
> >permanently close off the EGR valve due to its innards are
> >toast and that was a rebuilt one from a company in California
> >that specializes in them (the spring-tension arm on that fell
> >apart so those items are NLA).
>
> Since you indicate that you're flooding in both hot and cold
> conditions this
> could also indicate a way-too-rich condition overall at the AFM.  The
> springs in these things weaken over time resulting in a
> too-rich situation
> in all conditions and speeds.
>
> ---------------------------------------------------------------
> Tom Young                       '81 Vanagon
> Lafayette, CA 94549         '82 Westfalia
> ---------------------------------------------------------------
>
>