At 12:43 PM 6/12/2002, Vanagon man wrote: >Hello, just replaced my O2 sensor with digitool hooked up.....prior to >replacent, it was reading all over the place -1.7v to +2. volts..... Something very off there. The sensor itself doesn't generate outside the range of 0 to roughly 1 volt. >.....now with new one, it is reading around -.20 volts .............what >the? It's grounded -- either from the wire or the device itself is shorted/not generating voltage. It's got a little better ground than the ECU does, so you're seeing a zero reading as -0.2 volts (the difference between the two grounds).
>I have an exhaust gas analyzer, and cannot get the mixture to change on >the afm ( i am doing it per Bentley) When I give it throttle i get a >plume of black smoke............the idle stabilizer IS functioning, vacuum >is 15in at idle, and the fuel pressure reg is within spec. I did a test >to see if the fuel system maintained its pressure after cut off, and yes, >so no leaky injectors. The O2 sensor is telling the system it's lean, so the ECU is going balls-out to richen it. ECU doesn't have a sanity checker, it believes the dirty lying O2 sensor. Unplug the sensor -- if the Digitool reading goes to about 0.5 v then it's sensor problem and your mixture should be adjustable. If Digitool stays at -.2 then you have a shorted wire (could even be in digitool) or conceivably an ECU problem. david
>My afm is 3 months old. > >Adam P -- David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation" |
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