The O2 sensor is ignored for about 20 seconds after a restart or power cycling. It is also ignored as the engine goes to idle after being over run, (close throttle switch while going down hill), and full throttle.

Dennis

----- Original Message -----
From: Shawn Fowler <8059840@GMAIL.COM>
Date: Thursday, March 1, 2007 2:01 pm
Subject: Re: Diagnostic Question
To: vanagon@GERRY.VANAGON.COM

> Would turning off the engine and then back on also cause the ECU
> to default
> other components temporarily, such as the mass air flow sensor
> and therefore
> not pinpoint the O2 sensor?
>
>
> Howdy,
> I just picked up an 87 2wd Westfalia- the plugs, wires, cap,
> rotor and all
> fluids are new. I also replaced the ground on the O2 sensor. I
> have put two
> tanks of gas through it, one with fuel injector additive.
> Anyhow, the van
> runs well most of the time but intermittently starts missing on
> what I
> think are two cylinders. This happens when I am holding the gas
> steady and
> stops happening if I floor the gas pedal rather abruptly. A few
> secondsafter I take the pedal off the floor, it starts missing again.
> Does anyone else recognize these symptoms and have any suggestions?
> Thanks
> Shawn
> Portland Oregon
>
>
> ---------------------------------
>
> Date: Wed, 28 Feb 2007 23:13:22 -0500
> From: Dennis Haynes
> Subject: Re: Diagnostic Question
>
> Sounds like an O2 sensor issue. To confirm, when it happens,
> hold throttle
> steady and turn ignition off and back on. If it works ok for a
> short while,
> then definitely O2 sensor or wiring for it.
>
>
>
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