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Date:         Tue, 29 Apr 1997 15:23:48 -0400
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         "Charles Michaux." <cmichaux@carolinanet.com>
Subject:      Re: 84 dont smoke no more (27 MPG??)

I'm with Tony, 27 MPG!! What am I doing wrong!!

Charles

---------- > From: Tony Moore <tony@moorelab.com> > To: Multiple recipients of list <vanagon@lenti.med.umn.edu> > Subject: Re: 84 dont smoke no more (27 MPG??) > Date: Tuesday, April 29, 1997 3:08 PM > > Hi Earl, > > Wow! 27 MPG!?! In a Vanagon??? > > Did I miss some of this thread? Is yours a deisel? > > tony > > ---------- > > From: Earl Smith <earlsmit@islandnet.com> > > To: Multiple recipients of list <vanagon@lenti.med.umn.edu> > > Subject: 84 dont smoke no more > > Date: Tuesday, April 29, 1997 2:26 PM > > > > > > > > > >The story so far: about two months ago a sudden increase (or should it > be a > > >decrease?) in mileage from 27 mpg to 10 mpg. About a month ago, increase > of > > >about > > >ten thousand percent in black smoke emission. (Sure discourages > tail-gaters!) > > >Lots of excellent advice and suggestions from you folk, change of ECU > and Temp. > > >sensor 2, adjustment of AFM. Minimal improvement. > > > > > >Friday, finally took it to a mechanic. It took him three hours to > figure out > > >what was causing the problem and I think it was a great piece of > detective > > work. > > > > > >Wire coming from the O2 sensor on the 84 is a single lead that plugs > into > > >another > > >lead coming out of the wiring harness. That harness lead goes into the > > multipin > > >connector. For reasons known only to themselves, VW engineers made that > > harness > > >lead a co-axial cable with the shield grounded. Somewhere along that > lead, > > >inside the harness, the insulation around the inner wire broke and > allowed the > > >signal to ground on the shield. > > > > > >The mechanic, Niel, took endless trouble to explain the operation to me. > Seems > > >at 600 degrees the O2 sensor generates a 0.5 volt signal to the > computer. Over > > >that voltage indicates a rich mixture and the ECU decreases the fuel > flow. > > >Under > > >0.5 volts indicates a weak mixture and the ECU feeds in more gas. A > grounded > > >wire will produce a 0.0 voltage so guess what the ECU does?!!. Niel > simply > > took > > >apart the multipin connector and checked the voltage at the pin, then > cut > > >off the > > >faulty lead and replaced it with a single wire lead. Now ole Smoky > purrs like > > >a kitten and I am looking forward to 27mpg. again. > > > > > > > > > > > >


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