Probably the O2 sensor. The sensor is directly behind the left rear
wheel where it is subjected to air flow cooling it off and water and
road debris fouling it. I recommend upgrading it to a later 3 wire
sensor and adding the splash shield as used on the 2.1L Vanagons. The
part number for the clip on shield is 035-906-274. You can also make
something up to deflect the air and water off it.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Tracy Bonin
Sent: Tuesday, May 06, 2003 9:03 AM
To: vanagon@GERRY.VANAGON.COM
Subject: fuel system problems?

Hi all, well an impending problem has been getting worse bit by bit, and
so I figured I'd see if any idea's were available before I started. When
I was driving in 3rd the other day the bus did the inermittant sydrome
"buck", only once, then picked up and kept going. It did this again the
next afternoon, again only once while I was stepping on the gas in 3rd,
then picked up again and kept going. But last night I was on my way home
from school, and it started raining, and the bus started to do it again
this time while in 4th, but again while stepping on the gas; the only
thing is that it seemed to be getting alot worse, it happened more
frequently on that trek home. So, I don't really think that it is the
vanagon syndrome, because it seems that it only occurs when I let off
the gas and step back on, or when I'm lightly stepping on the gas it
seems. Which leads me to believe it's a fuel system problem. Any idea's
on what frequently might be bad in this situation. Or should I just
throw s
ome fuel system cleaner in there and see how it does? Maybe change the
filter too........please let me know.thanx,Tracy85' GL "Ripple"soon 65'
Splitty