Date: Sun, 21 Apr 2002 11:56:12 -0500
Reply-To: Mark Ingalls <ingalls_mark@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mark Ingalls <ingalls_mark@HOTMAIL.COM>
Subject: Re: Cough, Choke, Splutter! - Update
Content-Type: text/plain; format=flowed
Hi,
My 02 reading starts at .5 with a cold engine. I assume that reading is a
default reading since the 02 sensor does not produce voltage until hot.
Then as the 02 sensor gets hot the digitool reading increases to .7 or so.
By this time the temp 2 coolant input has gotten low enough for the system
to go into closed loop and the 02 will start cycling.
On a warm start I only have to wait for the 02 sensor to reheat, which on an
85 takes longer ( esp. if you restart and then have to wait at a red light
within the first block) because it does not have a built in heater.
I also have an extra ground on my digijet ecu case to the van body, and an
extra ground on the engine head to the van body.
Mark
85 GL
>From: Mike Finkbiner <mike_l_f@HOTMAIL.COM>
>Reply-To: Mike Finkbiner <mike_l_f@HOTMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Cough, Choke, Splutter! - Update
>Date: Sun, 21 Apr 2002 16:20:00 +0000
>
>A few weeks ago I reported that my '87 Westy was intermittantly running
>very
>poorly, no power, etc. The O2 digitool readings were very high, so I
>disconnected it. That solved the problem temporarily, but it recurred
>after
>a couple of days, intermittantly.
>
>Laurence suggested that I try a solution that worked for him, adding an
>additional ground from pin 19 on the ecu directly to the engine block.
>That's the pin which connects a ground to the shielding around the O2
>signal
>wire.
>
>I figured it was worth a try, so I got into the wiring harness next to the
>ECU and found the correct brown wire. On my '87, the main ground for the
>ecu is a larger brown wire outside the main bundle, while the O2 ground is
>smaller, and inside the bundle. Apparently in later years, one is brown
>and
>the other brown/white, but I would have to check Bently for the details.
>
>Since I did that, the engine has run fine in a bit of driving around town.
>I took a road trip yesterday, putting on ~ 200 miles with several stops. No
>problem, and gas mileage back up to 18+.
>
>If I want to be sure, I suppose I should disconnect the engine ground and
>see if it does happen again, but I would recommend this fix to anyone
>having
>similar symptoms.
>
>A question for any of you that have a digitool.
>
>My O2 sensor reading now starts out with a cold engine at ~ .3, then as the
>engine warms it steadily increases until it reaches about .8. At that
>point
>the Temp II reading has gotten down to about .15 and the O2 sensor is
>apparently hot enough to start working, so it begins to bounce up and down
>(.0 to.8) like it should.
>
>IIRC, before all this started the cold engine O2 reading would be about .5
>and stay there until the engine warmed, but I'm not sure.
>
>I would love to know what sort of readings other people are having!
>
>Thanks
>
>- Mike Finkbiner
>'87 Westy
>Moscow, ID
>
>mike_l_f@hotmail.com
>
>
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