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Date:         Sun, 22 Mar 2020 12:31:06 -0500
Reply-To:     mccullough bob <mbob1950@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         mccullough bob <mbob1950@GMAIL.COM>
Subject:      Re: O2 Sensor problem
In-Reply-To:  <CAJ-UWVYvy+HX3=gFhtm7Y9-xuPH6rNQPrQgdn7jdLeMYXc55zw@mail.gmail.com>
Content-Type: text/plain; charset=utf-8


 
Thanks for the reply Brian
I think your fine with yours and the amount you use it.
This van was fine with the o2 sensor that had been on it for 4 years. Its not Vanagon syndrome.
I have had small bouts of that before and this is different.  
My Syncro is my main ride so Ill keep tinkering with this one.


Bob
 
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> On 22, Mar2020, at 12:17 PM, brian megas <brianmegas@gmail.com> wrote:
> 
> Hi Bob.  This doesn't answer why you have the problem you have but I wanted to pass on some information.   We had to have our stock engine in our 86 Westy completely rebuilt at somewhere around 250,000 km. The shop in Nanaimo (Vancouver Island BC) that did the rebuild cut the wires to the O2 sensor.  They said the sensor causes more problems than it prevents. The rebuild was done maybe 250,000 km ago and the motor has run fine with the exception of the occassional stumbling / Vanagon syndrome.  Yes I am polluting the atmosphere a bit but I like to think I compensate for that by all the other things I do or don't do. For the last couple of years we only licence the van in the summertime.  The rest of the year I run it around our property  every few weeks just to keep things moving / lubricated.   
> cheers.    Brian
> 
> 
> On Sun, Mar 22, 2020, 9:25 AM mccullough bob, <mbob1950@gmail.com <mailto:mbob1950@gmail.com>> wrote:
> Dear Braintrust
> 
> Ive got a Gowesty 2.3 engine in a 91 Westy that I did a top end refresh with rings over the last year. It s my first water boxer rebuild and Im happy to say it is running.
> After starting it idles well and revs up normally. A few minuets later it starts to stumble on revving and will die with a hard throttle push.
> While driving when it starts to stumble, turning  ignition off and on will cure it for about a minute or two.
> Probably kicking ECU back into open loop for bit?
> 
> I have not found any vacuums leaks. The timing is set at 35 degrees btdc.
> 
> I found that disconecting the o2 sensor wire solves this problem. Engine runs good. Revs normally and climbs hills well
> It is running rich as expected. 
> 
> I swapped out the o2 sensor that came with the used  SS exhaust system with one the seller sent with it that looked new. No change. Same problem.
> Ive got one of the Bosch 13957 sensor that Gowesty recommends coming from ebay.
> 
> With engine running and o2 sensor connected, Ive got 0.92 v  sensor to ground. 
> Running and O2 disconnected   .91v on sensor and .44v on harness to ECU
> Sensor wire is not shorted to ground. o2 heater has 12v
> 
> I have
> 1 TB switch set
> 2 Blue temp sensor is good. Resistance and Temp same as Bentley graph. Also used a 300 ohm resistor to simulate hot engine.
> 3.Fuel pressure 29psi vacc hose off. 36psi hose on.
> 4. Swapped out with good AFM no change
> 5. Swapped out with good ECU no change
> 6. Swapped Distributor no change
> 7. ECU wiring harness  pin 10 gray to ISU and Temp Sensor good
>      pin18 green to Hall and ISV good
>      pin 6 brown/white to hall, TB switch, Temp sensor, AFM, good
>      pin 2 to O2 sensor good
>      pin 19 to ground good
> 8 Vacuum 15 “ at idle
> 
> Whew: I think thats what Ive done. Other than trying the new o2 sensor from ebay. 
> What am I missing?
> Thanks to all of you.
> Bob
> 
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