As mentioned before, you should check the function of the o2 sensor using a multimeter. It isn't hard to do. If you suspect a bad lead then wiggle the lead as you measure and see how the readings change. The open loop condition, o2 sensor disconnected, is not especially rich. A malfunctioning o2 sensor can make the van run excessively rich. One thing that is very useful for troubleshooting your engine is the Bentley manual that includes golf Jetta 89-92. Hard to believe, but the Bentley is very handy to have. Alistair
> On Jun 25, 2014, at 11:47 AM, Don Hanson <dhanson928@GMAIL.COM> wrote: > > Hi thanks all. > > So you think the bad wire might be the signal wire. Would that account > for this intermittent stumbling condition somehow? Is that likely? > > If the O2 sensor can be disconnected and the van will then run fine, but > rich...wouldn't that make it sort of unlikely that the faulty connection > could cause a real major but sharply periodic interruption of smooth > power? I mean, if this were a carbed vehicle I would say it was like the > plugs were suddenly fouling or the gas line was being partially > plugged....really bad missing and stumbling...front end dips stand on the > nose missing...then clean and normal power delivery... > > anyhow the O2 sensor was due to be changed being old and having lived > through a ruptured headgasket that I ran almost 2000 miles before repairing. > > I am going to change the Temp II sender also right now....because it is > supposed to be windy tomorrow and I want to go back to my favorite > windsurfing spot, that 100 mile round trip...My backup van, that Safari, > it's supposed to get pretty crappy gas mileage and it's all full of tools > now... > > > > >> On Wed, Jun 25, 2014 at 11:04 AM, Karl Wolz <wolzphoto@q.com> wrote: >> >> Correct. >> >> Karl Wolz >> >> >> >> |-----Original Message----- >> |From: Neil N [mailto:musomuso@gmail.com] >> |Sent: Wednesday, June 25, 2014 10:28 AM >> |To: Karl Wolz >> |Cc: vanagon@gerry.vanagon.com >> |Subject: Re: Inconsistent stumbling on resume throttle..Was >> |"vanagon syndrome?" >> | >> |Right. Wondered. So black wire Don saw is likely the O2 voltage output >> |("signal") wire? >> | >> | >> |On 6/25/14, Karl Wolz <wolzphoto@q.com> wrote: >> |> Pos and Neg are revesible. >> |> >> |> Karl Wolz >> |> >> |> >> |> >> |> |-----Original Message-----|The 3 wires are: >> |> | >> |> |positive, negative for O2 heater and "signal" (voltage >> |output) to ECU. >> |> | >> | >> | >> | >> |-- >> |Neil n >> | >> |Blog: tubaneil.blogspot.ca >> | >> |'88 Westy http://tinyurl.com/c8rlw6p >> | >> |'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ >> | >> |Vanagon VAG *Gas* inline-VR Engine Swap Group: >> | >> |http://tinyurl.com/d7gd5ej >> |
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