Date: Tue, 16 Apr 2002 17:20:32 -0700
Reply-To: Brent Christensen <sbsyncro@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Brent Christensen <sbsyncro@HOTMAIL.COM>
Subject: Re: K&N Filter and.....
Content-Type: text/plain; charset="iso-8859-1"
Sounds to me like it may be leaning out at the low end. With that new
filter, you are able to suck in a lot more air (in theory). The AFM may be
sending the right signal, but the ECU may not be programmed for the correct
fuel mixture curve, since it is based on the flow characteristics of the K &
N filter. This is assuming that the filter does indeed flow *that* much
more air...
The "performaance chip" is supposed to correct this problem. I have a K & N
on the way, and will test it with and without my performance chip-based ECU
and see if it behaves the way that you describe.
Nice to hear that the difference was that noticeable. Was your other filter
particularly dirty? (Can you see light through it?)
Brent Christensen
'89 Syncro Westy
Santa Barbara, CA
----- Original Message -----
From: "Jeremy Speer" <jspeer@POBOX.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, April 16, 2002 4:38 PM
Subject: K&N Filter and.....
> All,
>
> I just installed a K&N filter on my '89 Westy. Huzzah!
>
> From a modest local test drive i can honestly say that third gear pickup
> seems noticeably better. Really, no joke, i press the gas and she just
> leaps! Also throttle response in general seems slightly better.
>
> However, once warm, i seem to have a big dead area in the low RPM range of
> 2nd, 3rd and 4th gears that i want to believe is due to an aging air flow
> meter.
>
> The symptom is, once the engine is warm, when i shift from 1st to 2nd,
> unless i rev it way up, the pickup just dies when i shift to 2nd. However,
> if i keep my foot on the gas *in the exact same position*, the RPMs slowly
> build and then suddenly the vehicle just shoots ahead, i shift to 3rd and
> the cycle repeats. If i wind it up to 3900-4000 RPMs before shifting the
> "dead zone" is largely avoided.
>
> This does not happen when the engine is cold, i.e. i can shift from 1st to
> 2nd at 3000 rpms and she will just dig herself out of the RPM hole
smoothly
> and predictably. I'm noticing this now because, if you've been watching
the
> news, Minnesota broke all records yesterday by hitting 92F! We tied with
> Phoenix, AZ! Hence my engine is warm MUCH faster than two weeks ago when
we
> had 8 inches of snow.
>
> So... air flow meter, right? right?
>
> -jspeer
>
> '89 Westy, "Mystery Machine"
>
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