Date:         Fri, 21 Jan 2005 05:20:07 -0700
Reply-To:     jimt <camper@TACTICAL-BUS.INFO>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         jimt <camper@TACTICAL-BUS.INFO>
Subject:      Re: Driveability issues with a non-stock engine
In-Reply-To:  <20050121032245.94013.qmail@web53510.mail.yahoo.com>
Content-type: text/plain; charset="ISO-8859-1"

On 1/20/05 8:22 PM, "Damon Campbell" <damoncampbellvw@YAHOO.COM> wrote:

> Hello wise and all-knowing list... i have a troubling
> question (to me) to pose (to you).
> 
> Currently, my '84 westy is running a 2275 WBX.  Stock
> pistons, stroked to 82mm, and running big-valve heads.
> Fuel injection is stock 1.9 Digijet.  The problem is
> that it ironically lacks power, and has little (and
> sometimes NO!) power when accellerating from a dead
> stop.
> 
> I have the digitool hooked up, and primarily it is
> telling me that the engine drops full lean when coming
> off that dead stop (or just really low RPMs).  This
> can last 10 seconds or so, until it ever so gradually
> creeps up in speed.  To get around this, i've been
> working the clutch to keep above the seemingly magic
> 2k rpm range where it really perks up.
> 
> For general drivability, once i get going, the van
> surges under moderate to heavy throttle.  It is smooth
> (and seems happier) at very light throttle.  O2 sensor
> oscillates around .5V, unless you goose it, at which
> point it generally dips lean, but readjusts to .5V.
> If you disconnect the O2 sensor, the surging goes
> away, but it loses even more power.
> 
> I've checked the FPR, which seems good.  The injectors
> are recently serviced, and a vacuum leak check showed
> no leaks (used propane to see if the idle rose).  The
> O2 sensor has about 6k miles on it.
> 
> The kicker is, the AFM adjustments are completely out
> of whack (spring and idle).  This has been tweaked on
> (initially by BusLab down in Berkeley, CA), and now
> vainly by me in an effort to trick the 1.9AFM into
> liking the 2275.
> 
> Other possibly useful information is that on a
> previous (and similar) engine to this one, it was
> dialed in and ran like a bat out of heck.
> Unfortunately it died (my build error), so this is
> it's replacement.  All FI components are the same, so
> i am pretty sure i should be able to get this to work.
> 
> Do any of you have some advice on things to check for?
> I am getting quite worried, as my parents are coming
> to borrow the van for a month as they drive from
> Vancouver, Canada, down to Arizona, and i don't want
> to stick them with a lemon.  It would probably make
> it, it just wouldn't be any fun.
> 
> Thank you for any insight you may give me,
> -Damon
> 
> =====
> '84 Westy (Sparky) w/2.3L WBX
> Vancouver, BC
Start with a vacuum leak and AFM response.

••••••••••••••••••••••••••••••••••••••••
jimt
Planned insanity is best.
Remember that sanity is optional.
http://www.tactical-bus.info (tech info)
http://www.westydriver.com