Danny, if you have checked your grounds and they are good along with the
other tests you mentioned, I think I know what the problem could be.
Try unplugging your oxygen sensor and drive the van, and see if this
helps you out.  If it does then your Oxygen sensor is bad.  The other
thing I have seen is the end of the plug that goes from the oxygen
sensor wire to the ECU can go bad.  I am talking about the large green
wire that is located near the coil.  It plugs into the oxygen sensor
here so it goes from being a thick green wire to a thin black wire.  The
part I am talking about is the thick green wire side.  That is the wire
that goes to the ECU.  It is a coaxial wire (shielded) and over time it
can go bad on the end or along the length of it somewhere.  The first
thing to try is to cut the end off of this wire about an inch back then
strip the outer insulator of the wire back another inch.  You will see
copper wires covering an inner green wire.  You will then want to trim
the outer shielding wires with some wire cutters.  Now you will see the
inner wire.  Strip the insulation off of this about 1/4 of an inch and
crimp a new end connector onto it (female spade).  Now drive the van and
see if the problem is fixed.  Most of the time this will fix it.  If not
then you should test this wire at the ECU plug with an ohm meter to see
if there is continuity between the shield wire and the center wire.  If
there is then the wire has a bad spot in it at some point and should be
replaced with a new piece of shielded wire from the ECU plug.

I have dealt with this problem many times in the last couple of years
and it seems to be a problem that has recently cropped up because the
wiring harness is aging.  If have seen the problem on 1.9l and 2.1l
Vanagons.  Let me know if you need any more help.

Ken Wilford
John 3:16
www.vanagain.com

Danny C. wrote:
> Yes the timming is set correct and I have moved it both ways (advanced and retarded) to see if that would help and it does not, It was only happening once or twice a month when I was stopped at a stop light on a small up hill, as soon as i would try and take off it would kind of bogg down, now it it doing it more and more. Does any one think it could be the distributor? like the vacuum advance or something?
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> Danny C.
> '84 Westy (Vanny)
> '90 Jeep Cherokee 4x4
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