Date: Thu, 20 Jan 2005 19:22:45 -0800
Reply-To: Damon Campbell <damoncampbellvw@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Damon Campbell <damoncampbellvw@YAHOO.COM>
Subject: Driveability issues with a non-stock engine
Content-Type: text/plain; charset=us-ascii
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
__________________________________
Do you Yahoo!?
Take Yahoo! Mail with you! Get it on your mobile phone.
http://mobile.yahoo.com/maildemo
