Date: Sun, 16 Sep 2007 11:31:53 -0400
Reply-To: Raymond Paquette <raymondpaquette@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Raymond Paquette <raymondpaquette@GMAIL.COM>
Subject: Re: Rich on side, lean the other?
In-Reply-To: <46ED23DA.5040903@verizon.net>
Content-Type: text/plain; charset=ISO-8859-1
Mike
I don't doubt that you know what you're talking about, but that seems
bizarre. Why then is there an injector at each cylinder, instead of one big
one in the throttle body? Faster response? Why not more than one per
cylinder, or one on each bank?
So, if I were to disconnect one injector, the engine would continue to run
on all 4 cylinders, but will simply run lean? slower? with less power?
Ray
On 9/16/07, Mike Collum <collum@verizon.net> wrote:
>
> VW wasserboxers do indeed fire all injectors at once ... unlike the
> Subaru engines which fire them sequentially.
>
> Think of the wasserboxer as being similar to a carburetted engine where
> there is no sequential input of fuel. The fuel is simply available when
> the intake valves open.
>
> Mike
>
>
>
> Raymond Paquette wrote:
> > Scott
> >
> > Can you explain this? It would seem to me that if the injectors all
> fires
> > at once, then three cylinders would get gas when they weren't meant to
> be
> > firing.
> >
> > What am I missing?
> >
> > Ray
> >
> > On 9/16/07, Scott Daniel - Shazam <scottdaniel@turbovans.com> wrote:
> >> The ECU can't run any injectors richer than any others.
> >> It fires the 4 injectors at once, by supplying ground to them.
> >> It treats the injectors as one big injector in 4 parts.
> >> The Oxygen sensor is a good thought - it's very easy to measure their
> >> output
> >> with a digital voltmeter. If it's been on there several years, it could
> be
> >> due anyway.
> >>
> >> I can't think of why one side would run rich and the other learner.
> >> You could swap the injectors side to side and see if the problem
> follows
> >> the
> >> injectors, or stays in the same place.
> >> You could observe the spray pattern in accordance with the Bentley
> manual
> >> too.
> >> Scott
> >> www.turbovans.com
> >>
> >>
> >> -----Original Message-----
> >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of
> >> Michael Elliott
> >> Sent: Saturday, September 15, 2007 4:59 PM
> >> To: vanagon@GERRY.VANAGON.COM
> >> Subject: Rich on side, lean the other?
> >>
> >> I'm hunting for the reason that Mellow Yellow gets about 15% poorer
> >> mileage than other similar vans. See
> >>
> >> http://camping.elliott.googlepages.com/poormileage
> >>
> >> to see what I've learned so far about this 1.9L 1984 auto transmission
> >> with only 75,000 miles on it.
> >>
> >> One oddness I've found is that both plugs on the passenger side
> indicate
> >> lean condition, while the plugs on driver's side indicate rich
> condition.
> >> Where could such an asymmetry come from?
> >>
> >> There are NO visible signs of air leaks. The intake runners don't have
> any
> >> cracks, are tightened well against heads; the plenum/runner sleeves are
> >> clean and intact; and there are NO cracks in the exhaust bits that
> might
> >> cause a false-lean reading at the O2 sensor -- this is a southern
> >> California car and we outlawed snow and salt in 1932.
> >>
> >> This lateral mixture imbalance has me quite puzzled. I am getting
> little
> >> fret marks between my eyebrows! I'm dumping in a buttload of Techron
> >> injector cleaner in case the injectors on the lean side are packed up
> and
> >> the ECU is overcompensating by running #3 and #4 rich.
> >>
> >> But . . . and but, the overall mix at the O2 sensor indicates /lean/ on
> >> the highway, oddly (see
> http://camping.elliott.googlepages.com/poormileage
> >> ).
> >>
> >> I am replacing the O2 sensor on Monday. Because.
> >>
> >> --
> >> Mike "Rocket J Squirrel" Elliott
> >> 71 Type 2: the Wonderbus
> >> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> >> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> >> KG6RCR
> >>
> >
>
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