re
Why then would my engine
run poorly (laggy performance under 2500rpm) when it was cold (as well as
after warming up)?

well, that's what needs to be figured out !
check about 25 things on the engine ..........I'll bet you can find some.
I commonly find about 8 'half not right' things..........and 3 fully not
right things, on waterboxer engines all the time, regarding whether they run
right or not.

how nicely do your injectors spray, for example ?
when is the last time that was checked ?

----- Original Message -----
From: "Greg S" <sorkilmo@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, October 21, 2009 5:07 AM
Subject: Re: Thirsty motor with low power to 2,500 rpms. What's up?

> Wow. I just unplugged my O2 sensor and have had the same transformation.
> Wish I had figured this out months ago - but better late than never
> (thanks
> Greg).This still leaves me wondering something about the O2 sensor though.
> I
> understand that when the engine is cold the sensor should be in open loop,
> effectively disabling any input from the O2 sensor. Why then would my
> engine
> run poorly (laggy performance under 2500rpm) when it was cold (as well as
> after warming up)?
>
> Cheers,
> Greg S.
> 87' Hardtop Wolfsberg
> Ottawa ON
>
> On Sun, Oct 18, 2009 at 8:17 PM, Greg Potts <greg@pottsfamily.ca> wrote:
>
>> Hi Chris,
>>
>>
>> Then I tried unplugging the O2 sensor; It was like I bought a whole new
>> engine.
>>