Date: Mon, 17 Sep 2007 23:07:41 -0700
Reply-To: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject: Re: Rich on side, lean the other?
In-Reply-To: <000001c7f989$885f6f20$0601a8c0@DADSTOSHIBA>
Content-Type: text/plain; charset="US-ASCII"
Worn intake guides can't show up as an intake vacuum leak.
When the piston is descending on the intake stroke, with the intake valve
open, it wouldn't matter if the intake valve guide was very worn - or put it
this way - for an intake leak to show up that way, the intake valve guide
would have to be SO worn out it's silly, and they are not the ones that wear
so much anyway - it's the exhaust valve guides that get the wear.
Imbalance of wear, in rings or valves, left to right, makes good sense in
one side being noticeably different than the other.
Did the guy swap injectors side to side yet to see how that affects things
?
Spray pattern would be a very good thing to eyeball, and it's not hard to do
either - like 20 minutes to a half hour max to set it up so you can see the
injectors spray.
Very handy that way - letting the injectors just hang on the hose - you
can't do that with a 'fuel rail' type fuel injection set up, or at least not
easily. It's very easy on a vanagon.
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Dennis Haynes
Sent: Sunday, September 16, 2007 6:16 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Rich on side, lean the other?
The injector ground is the ECU control point. Each injector wire goes all
the way back to the ECU. The ground is how the ECU fires the injector. The
+12 volt is from the fuel pump circuit.
If one side is rich enough to noticeably foul the plugs, something is
wrong. Is it really fuel or possibly oil? One often over looked source of
vacuum leaks is the valve guides. An engine imbalance due to rings or
valves can show up on one side of an engine.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Bob Donalds
Sent: Sunday, September 16, 2007 12:25 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Rich on side, lean the other?
I cant remember if the injector grounding is in pairs per side on the
drivers head or not
intake boots are cheap and might look good but pick up some boots and
intake
gaskets and remove reseal both manifolds I just removed the intakes from
my
own van and found the area around the manifold to head gaskets was a
little
more than most. I disided to use little hi tack in both side of the
intake
gaskets just to see what happens. This would be a great time to unplug the
coil wire and check spray parterns and volume of the injectors. The
problem
with swaping is that the fuel lines is that they don't come apart as
easily
as they season how seasoned are your lines
Im high on the real thing A clean windshield a full tank of gas and
rebuilt
injecters with new fuel lines
bombs away dad
----- Original Message -----
From: "Mike Collum" <collum@VERIZON.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, September 15, 2007 5:41 PM
Subject: Re: Rich on side, lean the other?
> Just for grins, Mike, have you tried swapping the injectors from one
> side to the other to see if the indications change?
>
> Mike
>
>
>
> Michael Elliott wrote:
>> 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
>>