I have previously replaced the temp II sensor. What other sensors should I check? What about the temp I? Thanks, Ken The Bus Depot wrote: > > My '85 is running better with the O2 sensor disconnected. I have a problem > > at idle and when accelerating from a stop when the engine is cold with the > > O2 sensor connected. I have tried a generic no name from Napa and then > > went to the generic Bosch with wire from an old one. Neither made any > > difference. > > > > Any ideas? > > Unless I am greatly mistaken, the ECU has a "factory default" mode that it > will revert to if it cannot get a recognizeable reading from one of the > sensors that it relies on. In its default mode, it will ignore the readings > from several of the F.I. sensors and use its own factory preset. Therefore, > disconnecting one sensor (such as the 02 sensor) essentially removes several > from the circuit, any of which could be the faulty one which is causing the > van to run improperly. > > Another possibiliy (although less likely given your symptoms) is that in the > past someone has adjusted the fuel mixture based on the existence of an 02 > sensor that was giving incorrect readings. Now that you have installed one > that does work properly, this "compensating" fuel adjustment is causing the > mixture to be way off. You may want to have a shop with emissions testing > equipment look at your emissions levels. > > - Ron Salmon > The Bus Depot > http://www.busdepot.com > (215) 234-VWVW |
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