Date: Thu, 24 Aug 2000 17:44:59 -0300
Reply-To: Jean-Guy Savoie <jgsavoie@nbnet.nb.ca>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jean-Guy Savoie <jgsavoie@nbnet.nb.ca>
Subject: Re: Still running rich, now what
Content-Type: multipart/alternative;
Hi,
I also have an 84 Westy 1.9 digijet that was dumping fuel... 33L/100km, black clouds for
the people behind me. I did all the bently ignition, fuel, air, temp and ecu
tests, all up to specs. Changed the ox sensor and saw some improvement,
about 15 L/100 km, but when I changed the muffler only a few 1000 kms later
and changed the ox sensor to the new piece, the symptoms reappeared... so
I just simply disconnected it it and the van ran ok, not great, but at least
I wasn't leaving a trail of black soot behind me.
Over winter I came to consider tires, I noticed the PO had gone to a local
FLAPS and got shafted with P185/70/14 single side wall, much too small about
10% less in circumference) , much too flimsy, simply dangerous. After
taking a few long drives this summer, I changed the tires to Michelin LT
195/75/14 (within 2% of the stock 185/82/14) , hooked up the ox sensor and
the Vgon is running great, never better (about 12.5L/100km)
My theory, I contaminated the new sensor with the grease which eventually
burnt off and / or the undersized tires were throwing the ecu off to such an
extent that it was sending way too much gas.
Now, about your timming, that will defenitively throw gas millage off and
you will notice loss of power, but will it make an engine run rich??? that's
beyond my expertise. But if you have recently put in a new Cap, rotor, plugs, etc., I would ajust the timing, because I noticed differences in widths in various manufacturers rotors' contacts, which would set the timing off by a few degrees.
Hope this helps
JGS
----- Original Message -----
From: Matthew Pollard <poll7356@uidaho.edu>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, August 21, 2000 12:28 PM
Subject: Still running rich, now what
> 84 vanagon. Symptons: running rich, very rich. Poor idle.
>
> What i know: Somewhere in benlyey (24.36 or 36.24 ?) there is a trouble
> shooting page. I did all those. The temp sensors were the exact same ohms
> and were correct with temperatures (did it twice), oxygen sensor wire is
> ok, oxygen sensor is less that 800 miles old, injectors were a lovely
> pulsed conical spray pattern, afm is ok (track is clean and resistance is
> per bentley), plug wires are ok, idle stabilizer ok, fuel pressure
> regulator a bit high but this list said it was OK (no fuel coming out of
> the vacuum side). That is about it. Didn't check the timing but haven't
> messed with any timing stuff in years. I ran great then slowly got richer
> and richer- most noticable on downhill stretches when i am coasting.
>
> Would an oxygen sensor fail in a few months? Would a bad spark plug do
> this (800 or less miles on bosch Pt plugs, wires, cap, rotor).
>
> I am trying to not throw money at it, but trying to make intellegent
> repairs.
>
> What next? I guess i could replace the oxygen sensor with a cheap-o from
> my local flaps (no place to get Bosch in town), do a compression check,
> change the plugs at the same time.
>
> There is a good mechanic in town that will be getting my business really
> soon if i can't get her running.
>
> Help!
> TIA
> Matthew
>
>
> Matthew Pollard http://www.uidaho.edu/~poll7356
> Dept. of Chemistry http://www.chem.uidaho.edu
> University of Idaho http://www.uidaho.edu
>
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