Date: Sun, 16 Sep 2007 14:48:52 -0400
Reply-To: Mike Collum <collum@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mike Collum <collum@VERIZON.NET>
Subject: Re: Rich on side, lean the other?
In-Reply-To: <5d903de80709160831h477789ebh129de10685be75a5@mail.gmail.com>
Content-type: text/plain; charset=ISO-8859-1; format=flowed
I don't know why they didn't use throttle body injection.
If you unplug one injector it will run on 3 cylinders. I had a broken
wire on my #3 not long ago so I know that to be true.
You can swap the injector plugs and notice no difference in the running.
Mike
Raymond Paquette wrote:
> 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
>>>>
>
|